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Journal articles on the topic 'Olefin CM'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Bahri-Laleh, Naeimeh, Raffaele Credendino, and Luigi Cavallo. "The intriguing modeling of cis–trans selectivity in ruthenium-catalyzed olefin metathesis." Beilstein Journal of Organic Chemistry 7 (January 11, 2011): 40–45. http://dx.doi.org/10.3762/bjoc.7.7.

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In this study we have investigated computationally the origin of the cis–trans selectivity in the Ru-catalyzed cross metathesis (CM) of a prototype monosubstituted olefin, i.e., propene. Our calculations suggest that the origin of the preferential formation of trans-olefins is in the product release step, which prevents the initially formed cis-olefin from escaping the metal, and returns it to the reaction pool until the trans-olefin is formed.

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2

Astruc, Didier, Abdou K. Diallo, Sylvain Gatard, et al. "Olefin metathesis in nano-sized systems." Beilstein Journal of Organic Chemistry 7 (January 19, 2011): 94–103. http://dx.doi.org/10.3762/bjoc.7.13.

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The interplay between olefin metathesis and dendrimers and other nano systems is addressed in this mini review mostly based on the authors’ own contributions over the last decade. Two subjects are presented and discussed: (i) The catalysis of olefin metathesis by dendritic nano-catalysts via either covalent attachment (ROMP) or, more usefully, dendrimer encapsulation – ring closing metathesis (RCM), cross metathesis (CM), enyne metathesis reactions (EYM) – for reactions in water without a co-solvent and (ii) construction and functionalization of dendrimers by CM reactions.

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3

Żak, Patrycja, and Cezary Pietraszuk. "Application of olefin metathesis in the synthesis of functionalized polyhedral oligomeric silsesquioxanes (POSS) and POSS-containing polymeric materials." Beilstein Journal of Organic Chemistry 15 (February 4, 2019): 310–32. http://dx.doi.org/10.3762/bjoc.15.28.

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This mini-review summarizes the applications of olefin metathesis in synthesis and functionalization of polyhedral oligomeric silsesquioxanes (POSS) and POSS-containing polymeric materials. Three types of processes, i.e., cross metathesis (CM) of vinyl-substituted POSS with terminal olefins, acyclic diene metathesis (ADMET) copolymerization of divinyl-substituted POSS with α,ω-dienes and ring-opening metathesis polymerization (ROMP) of POSS-substituted norbornene (or other ROMP susceptible cycloolefins) are discussed. Emphasis was put on the synthetic and catalytic aspects rather than on the p

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4

Benke, Zsanett, Attila M. Remete, and Loránd Kiss. "A study on selective transformation of norbornadiene into fluorinated cyclopentane-fused isoxazolines." Beilstein Journal of Organic Chemistry 17 (August 13, 2021): 2051–66. http://dx.doi.org/10.3762/bjoc.17.132.

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This work presents an examination of the selective functionalization of norbornadiene through nitrile oxide 1,3-dipolar cycloaddition/ring-opening metathesis (ROM)/cross-metathesis (CM) protocols. Functionalization of commercially available norbornadiene provided novel bicyclic scaffolds with multiple stereogenic centers. The synthesis involved selective cycloadditions, with subsequent ROM of the formed cycloalkene-fused isoxazoline scaffolds and selective CM by chemodifferentiation of the olefin bonds of the resulting alkenylated derivatives. Various experimental conditions were applied for t

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5

Dong, Yifan, Laura I. Mosquera-Giraldo, Lynne S. Taylor, and Kevin J. Edgar. "Tandem modification of amphiphilic cellulose ethers for amorphous solid dispersion via olefin cross-metathesis and thiol-Michael addition." Polymer Chemistry 8, no. 20 (2017): 3129–39. http://dx.doi.org/10.1039/c7py00228a.

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6

Dong, Yifan, Laura I. Mosquera-Giraldo, Jacob Troutman, Brittny Skogstad, Lynne S. Taylor, and Kevin J. Edgar. "Amphiphilic hydroxyalkyl cellulose derivatives for amorphous solid dispersion prepared by olefin cross-metathesis." Polymer Chemistry 7, no. 30 (2016): 4953–63. http://dx.doi.org/10.1039/c6py00960c.

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7

Dong, Yifan, and Kevin J. Edgar. "Imparting functional variety to cellulose ethers via olefin cross-metathesis." Polymer Chemistry 6, no. 20 (2015): 3816–27. http://dx.doi.org/10.1039/c5py00369e.

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8

Awang, Nor Wahida, Ken Tsutsumi, Barbora Huštáková, Siti Fairus M. Yusoff, Kotohiro Nomura, and Bohari M. Yamin. "Cross metathesis of methyl oleate (MO) with terminal, internal olefins by ruthenium catalysts: factors affecting the efficient MO conversion and the selectivity." RSC Advances 6, no. 103 (2016): 100925–30. http://dx.doi.org/10.1039/c6ra24200f.

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Cross metathesis (CM) of methyl oleate (MO) with cis-4-octene, cis-stilbene, allyltrimethylsilane by RuCl<sub>2</sub>(PCy<sub>3</sub>)(IMesH<sub>2</sub>)(CHPh) yielded CM products with high MO conversion, high selectivity; the effect of olefin substituents, conditions was explored.

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9

Rusin, Aleksandra, Maciej Chrubasik, Katarzyna Papaj, Grzegorz Grynkiewicz, and Wiesław Szeja. "C-Glycosidic Genistein Conjugates and Their Antiproliferative Activity." Journal of Chemistry 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/951392.

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This paper presents our attempt to investigate scopes and the limitations of olefin cross-metathesis (CM) reaction in the synthesis of complex C-glycosides of genistein and evaluation of their antiproliferative activities. Novel genistein glycoconjugates were synthesized with the utility of CM reaction initiated by first and second generation of Grubbs catalysts. The relative reactivity of utilized olefins, based on categories proposed by Grubbs, was estimated.In vitroexperiments in cancer cell lines showed that the selected derivatives (3aand3f) exhibited higher antiproliferative potential th

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10

Patrzałek, Michał, Aleksandra Zasada, Anna Kajetanowicz та Karol Grela. "Tandem Olefin Metathesis/α-Ketohydroxylation Revisited". Catalysts 11, № 6 (2021): 719. http://dx.doi.org/10.3390/catal11060719.

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EWG-activated and polar quaternary ammonium salt-tagged ruthenium metathesis catalysts have been applied in a two-step one-pot metathesis-oxidation process leading to functionalized α-hydroxyketones (acyloins). In this assisted tandem process, the metathesis catalyst is used first to promote ring-closing metathesis (RCM) and cross-metathesis (CM) steps, then upon the action of Oxone™ converts into an oxidation catalyst able to transform the newly formed olefinic product into acyloin under mild conditions.

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11

Kalvachev, Yuri A., Cvetana P. Bezouhanova, and Hans Lechert. "Comparison of HZSM-5 Zeolite and SAPO-5 Molecular Sieve in 1-Hexanol Conversion." Collection of Czechoslovak Chemical Communications 57, no. 4 (1992): 739–44. http://dx.doi.org/10.1135/cccc19920739.

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The IR spectra of 1-hexanol adsorbed on SAPO-5 molecular sieves and on HZSM-5 zeolite were compared. It has been found, that both types of catalysts activate at 423 K the dehydration of 1-hexanol. In the IR spectra bands at 670 cm-1 (Z-isomer), 889 cm-1 (CH2=C< fragment), 911 cm-1 (CH2=CH-) and 965 cm-1 (E-isomer) have been observed, indicating that the skeletal and positional isomerization took place. A carbonyl compound (1730 cm-1) was formed at room temperature on all the investigated catalysts and disappeared upon heating. The activity of HZSM-5 in olefin isomerization and in dehydrogen

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12

Baldwin, Jean, Ian S. Butler та Denis F. R. Gilson. "Pressure tuning IR and micro-raman spectra of solid zeiseߣs salt, kp[pt(η-C2H4)Cl4], and the related dimer, [Pt(η-C2H4)Cl2]2". Proceedings, annual meeting, Electron Microscopy Society of America 50, № 2 (1992): 1536–37. http://dx.doi.org/10.1017/s0424820100132315.

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Pressure-tuning vibrational spectroscopy using diamond-anvil cells is now well established as a useful technique for investigating the phase-transition behavior of inorganic and organic solids. Much of our recent research has been focused on organotransition metal compounds, especially metal carbonyls. The pressure dependences (dv/dP) of the v(CO) modes provide important information on the extent of #- backbonding between the metals and the carbonyl groups. We have now extended these high-presure studies to other #-acceptor ligands, including olefins. We report here the results of a high-press

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13

Ryu, Yeonkyeong, Huiling Shao, Guillermo Ahumada, Peng Liu, and Christopher W. Bielawski. "Redox-switchable olefin cross metathesis (CM) reactions and acyclic diene metathesis (ADMET) polymerizations." Materials Chemistry Frontiers 3, no. 10 (2019): 2083–89. http://dx.doi.org/10.1039/c9qm00391f.

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14

Chattopadhyay, Shital Kumar, Subhankar Ghosh, and Suman Sil. "Cross metathesis-mediated synthesis of hydroxamic acid derivatives." Beilstein Journal of Organic Chemistry 14 (December 17, 2018): 3070–75. http://dx.doi.org/10.3762/bjoc.14.285.

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An alternative synthesis of α,ß-unsaturated hydroxamates via cross metathesis between a class-I olefin and N-benzyloxyacrylamide is reported. The reaction proceeds better in the presence of Grubbs’ second generation catalyst within short time and in good yields (57–85%) with a range of substrates. Subsequent hydrogenation of each of the CM products delivers the title compounds in moderate to very good yield (70–89%). An important demonstration of the protocol is the preparation of the unusual amino acid component of the bioactive cyclic peptide Chap-31.

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15

Luo, Wanli, Peng Jiang, Qiang Xu, et al. "Terahertz Sensor via Ultralow-Loss Dispersion-Flattened Polymer Optical Fiber: Design and Analysis." Materials 14, no. 17 (2021): 4921. http://dx.doi.org/10.3390/ma14174921.

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A novel cyclic olefin copolymer (COC)-based polymer optical fiber (POF) with a rectangular porous core is designed for terahertz (THz) sensing by the finite element method. The numerical simulations showed an ultrahigh relative sensitivity of 89.73% of the x-polarization mode at a frequency of 1.2 THz and under optimum design conditions. In addition to this, they showed an ultralow confinement loss of 2.18 × 10−12 cm−1, a high birefringence of 1.91 × 10−3, a numerical aperture of 0.33, and an effective mode area of 1.65 × 105 μm2 was obtained for optimum design conditions. Moreover, the range

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16

Dragutan, Ileana, Valerian Dragutan, Carmen Mitan, Hermanus CM Vosloo, Lionel Delaude, and Albert Demonceau. "Metathesis access to monocyclic iminocyclitol-based therapeutic agents." Beilstein Journal of Organic Chemistry 7 (May 27, 2011): 699–716. http://dx.doi.org/10.3762/bjoc.7.81.

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By focusing on recent developments on natural and non-natural azasugars (iminocyclitols), this review bolsters the case for the role of olefin metathesis reactions (RCM, CM) as key transformations in the multistep syntheses of pyrrolidine-, piperidine- and azepane-based iminocyclitols, as important therapeutic agents against a range of common diseases and as tools for studying metabolic disorders. Considerable improvements brought about by introduction of one or more metathesis steps are outlined, with emphasis on the exquisite steric control and atom-economical outcome of the overall process.

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17

Sabitha, Gowravaram, Bhaskar Vangala, S. Siva Sankara Reddy, and Jhillu S Yadav. "Total Synthesis of (+)-Cryptocaryalactone and of a Diastereoisomer of (+)-StrictifolioneviaRing-Closing Metathesis (RCM) and Olefin Cross-Metathesis (CM)." Helvetica Chimica Acta 93, no. 2 (2010): 329–38. http://dx.doi.org/10.1002/hlca.200900170.

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18

Trotter, Martin, Daniel Juric, Zahra Bagherian, et al. "Inkjet-Printing of Nanoparticle Gold and Silver Ink on Cyclic Olefin Copolymer for DNA-Sensing Applications." Sensors 20, no. 5 (2020): 1333. http://dx.doi.org/10.3390/s20051333.

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Inkjet technology as a maskless, direct-writing technology offers the potential for structured deposition of functional materials for the realization of electrodes for, e.g., sensing applications. In this work, electrodes were realized by inkjet-printing of commercial nanoparticle gold ink on planar substrates and, for the first time, onto the 2.5D surfaces of a 0.5 mm-deep microfluidic chamber produced in cyclic olefin copolymer (COC). The challenges of a poor wetting behavior and a low process temperature of the COC used were solved by a pretreatment with oxygen plasma and the combination of

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19

Tracz, Andrzej, Mateusz Matczak, Katarzyna Urbaniak, and Krzysztof Skowerski. "Nitro-Grela-type complexes containing iodides – robust and selective catalysts for olefin metathesis under challenging conditions." Beilstein Journal of Organic Chemistry 11 (October 6, 2015): 1823–32. http://dx.doi.org/10.3762/bjoc.11.198.

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Iodide-containing nitro-Grela-type catalysts have been synthesized and applied to ring closing metathesis (RCM) and cross metathesis (CM) reactions. These new catalysts have exhibited improved efficiency in the transformation of sterically, non-demanding alkenes. Additional steric hindrance in the vicinity of ruthenium related to the presence of iodides ensures enhanced catalyst stability. The benefits are most apparent under challenging conditions, such as very low reaction concentrations, protic solvents or with the occurrence of impurities.

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20

Choi, Si-Geun, Yong-Joong Lee, Young-Jun Jang, et al. "Influence of WS2Nanopowder Addition on Friction Characteristics of ta-C Coating by FCVA Method." Journal of Nanomaterials 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/983505.

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The influence of nano-sizeWS2powders on the tribological behavior of ta-C coatings by the filtered cathodic vacuum arc (FCVA) method under boundary lubrication conditions has been investigated. In order to characterize and understand tribological behaviors of nano-sizeWS2powders added to the synthetic oil (poly-alpha-olefin 6), lubricants with different mixture ratios, ranging from 2 to 8 wt%, have been prepared. ta-C coatings fabricated by FCVA method showed that the G-peak in the obtained Raman spectrum was shifted from 1520 to 1586 cm−1, indicating the sp3content increased for samples with

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21

Shen, M. C., H. S. Cheng, and P. C. Stair. "Scuffing Failure in Heavily Loaded Slow Speed Conformal Sliding Contacts." Journal of Tribology 113, no. 1 (1991): 182–91. http://dx.doi.org/10.1115/1.2920585.

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Scuffing failure phenomenon is studied experimentally in heavily loaded slow speed conformal sliding contacts of two flat thrust washers in a regime close to boundary lubricated condition. Lubricants used are base oils of pure mineral oil and poly-α-olefin (PAO). Speed range is 0.76–33.0 cm/s. Material studied is hardened 52100 steel for both washers in contact. Scuffing threshold load at failure, friction, and surface bulk temperature are major data measured. The surface total temperature is determined with the measure bulk temperature in addition to the surface flash temperature calculated u

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22

Yakasai, Izaddeen, Pg Emeroylariffion Abas, Shubi F. Kaijage, Wahyu Caesarendra, and Feroza Begum. "Proposal for a Quad-Elliptical Photonic Crystal Fiber for Terahertz Wave Guidance and Sensing Chemical Warfare Liquids." Photonics 6, no. 3 (2019): 78. http://dx.doi.org/10.3390/photonics6030078.

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A porous-core photonic crystal fiber based on a cyclic olefin homopolymer (Zeonex) is proposed; it shows high birefringence, high core power fraction, low losses, and near-zero flat dispersion. The fiber’s core was designed with quad-elliptical (QE) air holes with its center occupied by bulk background material. The superiority of the QE design over the commonly adopted tri- and penta-elliptical (TE and PE) core designs is demonstrated. The presence of the bulk material at the core center and the geometrical configuration cause a broad contrast in phase refractive indices, thereby producing hi

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23

Paradiso, Veronica, Raffaele Contino, and Fabia Grisi. "NHC Ligand Effects on Ru-Catalyzed Cross-Metathesis of Renewable Materials." Catalysts 10, no. 8 (2020): 904. http://dx.doi.org/10.3390/catal10080904.

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As petrochemical resources become increasingly scarce and expensive, much attention has been focused on renewable resources from biomass as alternative options for producing basic building blocks for chemical manufacturing. Catalytic olefin metathesis represents a powerful tool to transform biosourced structural motifs in valuable commodity, fine, and specialty chemicals. In that respect, the appropriate choice of the catalyst is the key issue of each metathesis transformation. The current study examines the influence of different N-heterocyclic carbene (NHC) ligands containing one or two N-al

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24

Mannhardt, Karin, J. J. Novosad, and L. L. Schramm. "Comparative Evaluation of Foam Stability to Oil." SPE Reservoir Evaluation & Engineering 3, no. 01 (2000): 23–34. http://dx.doi.org/10.2118/60686-pa.

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Summary Foam performance was evaluated by several experimental methods (corefloods, bulk foam stability, micromodel observations, interfacial parameters) using three commercial surfactants, either by themselves or mixed with a fluorinated surfactant. The presence of oil reduced foam mobility reduction factors (Fmr) to different degrees; excellent Fmr were still attained with some surfactants in the presence of residual oil. Using the fluorinated surfactant as additive enhanced the oil tolerance of some, but not all, foams. The tested foams exhibited oil transporting properties. Each foam adjus

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25

Tateishi, Yohei, Makoto Fujimura, Takashi Iga, and Toshihiko Jimbo. "New Build-up Insulation Material Based on Cyclo-Olefin Polymer for High-Performance IC Packages." International Symposium on Microelectronics 2012, no. 1 (2012): 000991–97. http://dx.doi.org/10.4071/isom-2012-wp64.

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A variety of mobile devices such as smart phones, ultra thin laptops, and tablet PCs have been introduced to the world wide market, and the demands are gaining momentum. In technological perspectives, the trend is going to increased amount of data transfer and further miniaturization of the devices for more comfortable browsing and convenience. With this trend, a build-up insulation film material that plays an important role in interposer substrates for semiconductor packaging, is required to have higher performance to cover 1) low transmission loss, 2) extremely small line and space (L/S) wit

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26

Rosenkranz, Andreas, Saad Ahmed Khan, Adam Szurdak, Gerhard Hirt, and Carsten Gachot. "Wear behavior of micro-coined steel surfaces under mixed lubrication." Industrial Lubrication and Tribology 69, no. 6 (2017): 1033–39. http://dx.doi.org/10.1108/ilt-11-2015-0167.

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Purpose The purpose of this study is to investigate the influence of hemispherical structures fabricated by hot micro-coining on the resulting wear performance. Hemispherical structures with different area densities (20 and 30 per cent), depths (50 and 100 µm) and diameters (100 and 200 µm) were fabricated by hot micro-coining on stainless steel samples. Design/methodology/approach The wear performance of these samples was studied using a ball-on-disk tribometer in rotational sliding mode using a normal load of 30 N and a fixed sliding velocity of 2 cm/s. Two different poly-(alpha)-olefin (PAO

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27

Liu, Junrong, and James J. Sheng. "Investigation of Countercurrent Imbibition in Oil-Wet Tight Cores Using NMR Technology." SPE Journal 25, no. 05 (2020): 2601–14. http://dx.doi.org/10.2118/201099-pa.

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Summary Countercurrent spontaneous imbibition is one of the most significant mechanisms for the mass transfer between fractures and matrixes in tight reservoirs. Adding surfactants and pressurization are two common methods to enhance the imbibition. In this study, we used the low-field nuclear magnetic resonance (NMR) instrument to monitor the dynamic imbibition processes with surfactants added and fluid pressure applied. The T2 relaxation distribution and corresponding water saturation profiles during the imbibition process were obtained by analyzing NMR responses. We found that sodium alpha-

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28

Sim, Siong Fong, Min Xuan Laura Chai, and Amelia Laccy Jeffrey Kimura. "Prediction of Lard in Palm Olein Oil Using Simple Linear Regression (SLR), Multiple Linear Regression (MLR), and Partial Least Squares Regression (PLSR) Based on Fourier-Transform Infrared (FTIR)." Journal of Chemistry 2018 (November 8, 2018): 1–8. http://dx.doi.org/10.1155/2018/7182801.

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Fourier-transform infrared (FTIR) offers the advantages of rapid analysis with minimal sample preparation. FTIR in combination with multivariate approach, particularly partial least squares regression (PLSR), has been widely used for adulterant analysis. Limited study has been done to compare PLSR with other regression strategies. In this paper, we apply simple linear regression (SLR), multiple linear regression (MLR), and PLSR for prediction of lard in palm olein oil. Pure palm olein oil was adulterated with lard at different concentrations and subjected to analysis with FTIR. The marker band

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29

Li, Wei, Sen Han, Xiaokang Fu, and Ke Huang. "Evaluation of Micro-Mechanism and High- and Low-Temperature Rheological Properties of Disintegrated High Volume Crumb Rubber Asphalt (DHVRA)." Materials 14, no. 5 (2021): 1145. http://dx.doi.org/10.3390/ma14051145.

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The aims of this paper are to prepare disintegrated high volume crumb rubber asphalt (DHVRA) with low viscosity, good workability and low-temperature performance by adding disintegrating agent (DA) in the preparation process, and to further analyze the disintegrating mechanism and evaluated high-temperature and low-temperature rheological properties. To obtain DHVRA with excellent comprehensive performance, the optimum DA dosage was determined. Based on long-term disintegrating tests and the Fluorescence Microscopy (FM) method, the correlations between key indexes and crumb rubber (CR) particl

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30

Pan, Xian-Ming, Eugenie Bastian, and Clemens von Sonntag. "The Reactions of Hydroxyl Radicals with 1,4-and 1,3-Cyclohexadiene in Aqueous Solution." Zeitschrift für Naturforschung B 43, no. 9 (1988): 1201–5. http://dx.doi.org/10.1515/znb-1988-0919.

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Abstract The reactions of radiolytically generated hydroxyl radicals and H atoms with 1,4- and 1,3-cyclohexadiene were studied by pulse radiolysis and product analysis. Hydrogen abstraction from these substrates by the OH radical yields the cyclohexadienyl radical (ε (310 nm) = 4400 dm3 mol-1 cm-1 from the reaction of the H atom with benzene) with an efficiency of 50% (0.29 ,μmol J-1) in the case of 1,4-cyclohexadiene and 25% (0.15 ,μmol J-1) in the case of 1,3-cyclohexadiene as determined by pulse radiolysis. The remaining OH radicals add to the olefin. In 1.4-cyclohexa- diene the yield of th

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31

Hanson, Paul R., Susanthi Jayasinghe, Soma Maitra, Cornelius N. Ndi, and Rambabu Chegondi. "A modular phosphate tether-mediated divergent strategy to complex polyols." Beilstein Journal of Organic Chemistry 10 (October 7, 2014): 2332–37. http://dx.doi.org/10.3762/bjoc.10.242.

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An efficient and divergent synthesis of polyol subunits utilizing a phosphate tether-mediated, one-pot, sequential RCM/CM/reduction process is reported. A modular, 3-component coupling strategy has been developed, in which, simple “order of addition” of a pair of olefinic-alcohol components to a pseudo-C 2-symmetric phosphoryl chloride, coupled with the RCM/CM/reduction protocol, yields five polyol fragments. Each of the product polyols bears a central 1,3-anti-diol subunit with differential olefinic geometries at the periphery.

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32

Daniyan, Ilesanmi A., Emmanuel I. Bello, Tunde I. Ogedengbe, and Pius B. Mogaji. "Gas Chromatography and Fourier Transform Infrared Analysis of Biodiesel from Used and Unused Palm Olein Oil." International Journal of Engineering Research in Africa 42 (April 2019): 47–64. http://dx.doi.org/10.4028/www.scientific.net/jera.42.47.

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The need for quality control of biodiesel is important to ensure the development of a clean, trouble free and safe alternative fuel technology to fossil diesel. In this work, the gas chromatography analysis of the biodiesel produced from used frying oil was carried out using PerkinElmer Clarus 500 Gas Chromatograph (GC), fitted with a capillary split injector and Fourier Infrared Detector (FID). Also, the Fourier Transform Infrared Spectroscopy was used to determine and monitor the concentration of biodiesel produced from used and unused palm olein oil. The Fourier Transform Infrared (FTIR) an

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33

Liang, Yang, Fu-Rong Zeng, and Zi-Long Li. "Precision Aliphatic Polyesters via Cross-Metathesis Polymerization." Current Organic Synthesis 16, no. 2 (2019): 188–204. http://dx.doi.org/10.2174/1570179416666181206095131.

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Cross-metathesis (CM), a carbon-carbon bond transformation that features exceptional selectivity, reactivity and tolerance to functionalities, has been extensively investigated in organic chemistry. On the other hand, the use of CM in polymer synthesis is also growing in both scope and breadth, thus offering a wealth of opportunities for introducing a vast range of functionalities into polymer backbone so as to manipulate properties and expand applications. In this review, we propose the concept of “cross-metathesis polymerization” (CMP) referring to polymer synthesis via repetitive CM reactio

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Berndt, T., M. Sipilä, F. Stratmann, et al. "Enhancement of atmospheric H<sub>2</sub>SO<sub>4</sub> / H<sub>2</sub>O nucleation: organic oxidation products versus amines." Atmospheric Chemistry and Physics 14, no. 2 (2014): 751–64. http://dx.doi.org/10.5194/acp-14-751-2014.

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Abstract. Atmospheric H2SO4 / H2O nucleation influencing effects have been studied in the flow tube IfT-LFT (Institute for Tropospheric Research – Laminar Flow Tube) at 293 ± 0.5 K and a pressure of 1 bar using synthetic air as the carrier gas. The presence of a possible background amine concentration in the order of 107–108 molecule cm−3 throughout the experiments has to be taken into account. In a first set of investigations, ozonolysis of olefins (tetramethylethylene, 1-methyl-cyclohexene, α-pinene and limonene) for close to atmospheric concentrations, served as the source of OH radicals an

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35

Ismail, A. H., S. Wongsakul, Ismail-Fitry M.R., Rozzamri A., and M. Mat Yusoff. "Physical properties and sensory acceptance of red palm olein-based low-fat ice cream added with guar gum and xanthan gum as stabilizers." Food Research 4, no. 6 (2020): 2073–81. http://dx.doi.org/10.26656/fr.2017.4(6).229.

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Red palm olein (RPOL) is rich in nutritional and antioxidant compounds including carotenoids, tocopherols, and tocotrienols which makes it beneficial in food applications. However, to maintain the colloidal stability of RPOL in ice cream is challenging. Therefore, this study was carried out to formulate value-added ice creams supplemented with RPOL (0.1-5.0% w/w) in combination with guar gum (GG; 0.0-0.4% w/w) or xanthan gum (XG; 0.0-0.4% w/w) as stabilizers. Physical properties and sensory acceptance of these ice creams were determined in comparison with selected commercial ice cream samples

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Mohd Zobir, Syazwan Afif, Suriani Abu Bakar, Saifollah Abdullah, Zulkarnain Zainal, Siti Halimah Sarijo, and Mohamad Rusop. "Raman Spectroscopic Study of Carbon Nanotubes Prepared Using Fe/ZnO-Palm Olein-Chemical Vapour Deposition." Journal of Nanomaterials 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/451473.

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Multiwalled carbon nanotubes (MWCNTs) were synthesized using Fe/ZnO catalyst by a dual-furnace thermal chemical vapor deposition (CVD) method at 800–1000°C using nitrogen gas with a constant flow rate of 150 sccm/min as a gas carrier. Palm olein (PO), ferrocene in the presence of 0.05 M zinc nitrate, and a p-type silicon wafer were used as carbon source, catalyst precursor, and sample target, respectively. D, G, and G′bands were observed at 1336–1364, 1559–1680, and 2667–2682 cm-1, respectively. Carbon nanotubes (CNTs) with the highest degree of crystallinity were obtained at around8000°C, and

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Li, Z., M. T. Navarro, J. Martínez-Triguero, J. Yu, and A. Corma. "Synthesis of nano-SSZ-13 and its application in the reaction of methanol to olefins." Catalysis Science & Technology 6, no. 15 (2016): 5856–63. http://dx.doi.org/10.1039/c6cy00433d.

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Severcan, Feride, Nese Kaptan, and Belma Turan. "Fourier Transform Infrared Spectroscopic Studies of Diabetic Rat Heart Crude Membranes." Spectroscopy 17, no. 2-3 (2003): 569–77. http://dx.doi.org/10.1155/2003/472834.

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Application of mid infrared spectroscopy in diabetic tissues will be presented which highlight the promise of this technique in medical research. Examples presented mainly will focus on diabetic rat heart crude membranes. Diabetes mellitus (DM) was induced in rats by streptozotocin (STZ) injection that is one of the most popular experimental models for the study of type I diabetes. The shift in the peak positions, bandwidths and the intensity of the bands in FTIR spectra were analyzed to have valuable structural and functional information, which may have diagnostic value. In the diabetic membr

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Berndt, T., M. Sipilä, F. Stratmann, et al. "Enhancement of atmospheric H<sub>2</sub>SO<sub>4</sub>/H<sub>2</sub>O nucleation: organic oxidation products versus amines." Atmospheric Chemistry and Physics Discussions 13, no. 6 (2013): 16301–35. http://dx.doi.org/10.5194/acpd-13-16301-2013.

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Abstract. Atmospheric H2SO4/H2O nucleation influencing effects have been studied in the flow tube IfT-LFT (Institute for Tropospheric Research – Laminar Flow Tube) at 293 ± 0.5 K and a pressure of 1 bar using synthetic air as the carrier gas. The presence of a possible background amine concentration in the order of 107–108 molecule cm−3 throughout the experiments has to be taken into account. In a first set of investigations, ozonolysis of olefins (tetramethylethylene, 1-methyl-cyclohexene, α-pinene and limonene) for close to atmospheric concentrations, served as the source of OH radicals and

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Vanbiervliet, Elise, Stéphane Fouquay, Guillaume Michaud, Frédéric Simon, Jean-François Carpentier та Sophie Guillaume. "α,ω-Epoxide, Oxetane, and Dithiocarbonate Telechelic Copolyolefins: Access by Ring-Opening Metathesis/Cross-Metathesis Polymerization (ROMP/CM) of Cycloolefins in the Presence of Functional Symmetric Chain-Transfer Agents". Polymers 10, № 11 (2018): 1241. http://dx.doi.org/10.3390/polym10111241.

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Epoxide- and oxetane-α,ω-telechelic (co)polyolefins have been successfully synthesized by the tandem ring-opening metathesis polymerization (ROMP)/cross-metathesis (CM) of cyclic olefins using Grubbs’ second-generation catalyst (G2) in the presence of a bifunctional symmetric alkene epoxide- or oxetane-functionalized chain-transfer agent (CTA). From cyclooctene (COE), trans,trans,cis-1,5,9-cyclododecatriene (CDT), norbornene (NB), and methyl 5-norbornene-2-carboxylate (NBCOOMe), with bis(oxiran-2-ylmethyl) maleate (CTA 1), bis(oxetane-2-ylmethyl) maleate (CTA 2), or bis(oxetane-2-ylmethyl) (E)

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Barnaby, Andrea Goldson, Jesse Clarke, Dane Warren, and Kailesha Duffus. "Free Radical Scavenging Capacity, Carotenoid Content, and NMR Characterization of Blighia sapida Aril Oil." Journal of Lipids 2018 (August 13, 2018): 1–7. http://dx.doi.org/10.1155/2018/1762342.

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Blighia sapida aril oil is rich in monounsaturated fatty acids but is however currently not utilized industrially. The oil was characterized utilizing nuclear magnetic resonance (NMR) and Fourier Transform Infrared Spectroscopy (FTIR). A spectrophotometric assay was conducted to determine the free radical scavenging properties and carotenoid content of the oil. Chemical shifts resonating between δ 5.30 and 5.32 in the 1H NMR are indicative of olefinic protons present in ackee aril oil which are due to the presence of oleic acid. A peak at 3006 cm−1 in the FTIR spectra confirms the high levels

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Sumiyoshi, T., W. Weber, and W. Schnabel. "Thiophosphonyl Radicals Photolytic Generation and Reactivity Towards Olefinic Compounds." Zeitschrift für Naturforschung A 40, no. 6 (1985): 541–43. http://dx.doi.org/10.1515/zna-1985-0601.

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Upon irradiation with UV light (λ = 347 nm), 2,4,6-trimethylbenzoyldiphenylphosphine sulfide was found to be fragmented into free radicals by α-scission (F(k) = 0.3 ± 0.1): Flash photolysis studies revealed that the optical absorption spectrum of diphenylthiophosphonyl radicals, S = P(Ph)2. possesses a strong band with λmax = 340 nm and a somewhat weaker band with λmax ≈ 500 nm (e340nm = 1.2 ± 0.2) · 104 1/mol cm). The reactivity towards olefinic compounds, M, is 10 to 30 times lower than in the case of O = P(Ph)2 radicals. Typical bimolecular rate constants (in 1/mol s) of the reaction of S =

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A, Saira Khatheeja, Safiullah A, Surapaneni Krishna Mohan, Vishnu Priya V, and Prabhakaran AR. "FTIR-ATR spectroscopy as a diagnostic tool in the diagnosis of hypercholesterolemia induced by cholesterol-rich diet in rats." International Journal of Research in Pharmaceutical Sciences 9, no. 3 (2018): 1056. http://dx.doi.org/10.26452/ijrps.v9i3.1629.

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Clinical Diagnosis is the process that identifies a possible disease or disorder that can be diagnosed through analysing specific components with multiple techniques and procedures that identifies the internal physiological changes. FTIR-ATR is a non-invasive, reagent-free diagnostic tool which can be rapidly and simultaneously analyze several components in the biological fluids and organs and which can be employed in analyzing the biomolecules. Hypercholesterolemia was induced in albino rats by feeding the animals with the regular diet supplemented with 1% cholesterol and 0.5 % cholic acid sa

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Yang, Bin, and Ming Chen. "Py–FTIR–GC/MS Analysis of Volatile Products of Automobile Shredder Residue Pyrolysis." Polymers 12, no. 11 (2020): 2734. http://dx.doi.org/10.3390/polym12112734.

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Automobile shredder residue (ASR) pyrolysis produces solid, liquid, and gaseous products, particularly pyrolysis oil and gas, which could be used as renewable alternative energy resources. Due to the primary pyrolysis reaction not being complete, the yield of gaseous product is low. The pyrolysis tar comprises chemically unstable volatiles before condensing into liquid. Understanding the characteristics of volatile products will aid the design and improvement of subsequent processes. In order to accurately analyze the chemical characteristics and yields of volatile products of ASR primary pyro

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Vassenden, Frode, Torleif Holt, Amir Ghaderi, and Arild Solheim. "Foam Propagation on Semi-Reservoir Scale." SPE Reservoir Evaluation & Engineering 2, no. 05 (1999): 436–41. http://dx.doi.org/10.2118/58047-pa.

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Summary Foam propagation in co-injection of gas and surfactant solution has been studied in a 10-m-long flow apparatus, equipped with pressure ports and fluid sampling valves for every 1 m. The data have been compared to the results of a core scale foam flooding experiment with the same porous medium. The propagation experiments on the 10 m scale revealed that the foam front propagated significantly slower than the injected fluid front. It appeared that foam propagation was not limited by surfactant transport, but was delayed due to the presence of oil in the porous medium. The experiments hav

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Raimondo, Marialuigia, Felice De Nicola, Ruggero Volponi, et al. "Self-repairing CFRPs targeted towards structural aerospace applications." International Journal of Structural Integrity 7, no. 5 (2016): 656–70. http://dx.doi.org/10.1108/ijsi-11-2015-0053.

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Purpose The purpose of this paper is to describe the first experiments to manufacture self-healing carbon fiber reinforced panels (CFRPs) for the realization of structural aeronautic components in order to address their vulnerability to impact damage in the real service conditions. Design/methodology/approach The developed self-healing system is based on ring-opening metathesis polymerizations reaction of microencapsulated 5-ethylidene-2-norbornene/dicyclopentadiene cyclic olefins using Hoveyda-Grubbs’ first generation catalyst as initiator. In this work, the self-healing resin is infused into

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Fang, Zheng, Wei Deng, Yanli Zhang, et al. "Open burning of rice, corn and wheat straws: primary emissions, photochemical aging, and secondary organic aerosol formation." Atmospheric Chemistry and Physics 17, no. 24 (2017): 14821–39. http://dx.doi.org/10.5194/acp-17-14821-2017.

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Abstract. Agricultural residues are among the most abundant biomass burned globally, especially in China. However, there is little information on primary emissions and photochemical evolution of agricultural residue burning. In this study, indoor chamber experiments were conducted to investigate primary emissions from open burning of rice, corn and wheat straws and their photochemical aging as well. Emission factors of NOx, NH3, SO2, 67 non-methane hydrocarbons (NMHCs), particulate matter (PM), organic aerosol (OA) and black carbon (BC) under ambient dilution conditions were determined. Olefin

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Mathurin, Jérémie, Emmanuel Dartois, Thomas Pino, et al. "Nanometre-scale infrared chemical imaging of organic matter in ultra-carbonaceous Antarctic micrometeorites (UCAMMs)." Astronomy & Astrophysics 622 (February 2019): A160. http://dx.doi.org/10.1051/0004-6361/201833957.

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Aims. The composition of comets and asteroids sheds light on the formation and early evolution of the solar system. The study of micrometeorites containing large concentrations of carbonaceous material (i.e. ultra-carbonaceous antarctic micrometeorites, UCAMMs) allows for unique information on the association of minerals and organics at surface of icy objects (comets) to be obtained. Methods. In this work we map the organic matter of UCAMMs collected in the Antarctic snow, at sub-wavelength spatial scales using the Atomic Force Microscope InfraRed (AFMIR) technique. The sample preparation did

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Wang, Zhifang, Yi Yang, Zhengfeng Zhao, et al. "Green synthesis of olefin-linked covalent organic frameworks for hydrogen fuel cell applications." Nature Communications 12, no. 1 (2021). http://dx.doi.org/10.1038/s41467-021-22288-9.

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AbstractGreen synthesis of crystalline porous materials for energy-related applications is of great significance but very challenging. Here, we create a green strategy to fabricate a highly crystalline olefin-linked pyrazine-based covalent organic framework (COF) with high robustness and porosity under solvent-free conditions. The abundant nitrogen sites, high hydrophilicity, and well-defined one-dimensional nanochannels make the resulting COF an ideal platform to confine and stabilize the H3PO4 network in the pores through hydrogen-bonding interactions. The resulting material exhibits low act

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Kiss, Loránd, Zsanett Benke, Melinda Nonn, Attila M. Remete, and Santos Fustero. "Diversity-Oriented Synthesis of Highly Functionalized Alicycles across Dipolar Cycloaddition/Metathesis Reaction." Synlett, May 19, 2021. http://dx.doi.org/10.1055/s-0040-1706041.

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AbstractThis Account gives an insight into the selective functionalization of some readily available commercial cyclodienes across simple chemical transformations into functionalized small-molecular scaffolds. The syntheses involved selective cycloadditions, followed by ring-opening metathesis (ROM) of the resulting azetidin-2-one derivatives or isoxazoline frameworks and selective cross metathesis (CM) by discrimination of the C=C bonds on the alkenylated heterocycles. The CM protocols have been described when investigated under various conditions with the purpose on exploring chemodifferenti

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