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Journal articles on the topic 'ALICYCLIC SYSTEMS'

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Published: 18 May 2024

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1

EWING, D. F. "ChemInform Abstract: Large Alicyclic Ring Systems." ChemInform 26, no. 3 (2010): no. http://dx.doi.org/10.1002/chin.199503280.

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2

Zhubanov, B. A., V. D. Kravtsova, R. F. Mukhamedova, and K. Kh Bekmagambetova. "New polymer systems based on alicyclic polyimides." Russian Journal of Applied Chemistry 79, no. 11 (2006): 1869–74. http://dx.doi.org/10.1134/s1070427206110255.

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3

Kappe, Thomas, Barbara Schnell, Krassimira Georgieva, et al. "Sulfidation of Alicyclic and Heterocyclic 1,3-Dicarbonyl Systems." Phosphorus, Sulfur, and Silicon and the Related Elements 95, no. 1-4 (1994): 349–50. http://dx.doi.org/10.1080/10426509408034233.

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4

Oszczapowicz, Janusz, and Irena Oszczapowicz. "Substituent effects in13C NMR spectra. Part II-Alicyclic rigid systems." Journal of Physical Organic Chemistry 18, no. 8 (2005): 818–24. http://dx.doi.org/10.1002/poc.946.

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5

Mączka, Wanda Krystyna, and Agnieszka Mironowicz. "Biotransformation of Isoprenoids and Shikimic Acid Derivatives by a Vegetable Enzymatic System." Zeitschrift für Naturforschung C 59, no. 3-4 (2004): 201–4. http://dx.doi.org/10.1515/znc-2004-3-413.

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In biotransformations carried out under similar conditions enzymatic systems from carrot (Daucus carota L.), celeriac (Apium graveolens L. var. rapaceum) and horse-radish (Armoracia lapathifolia Gilib.) hydrolyzed the ester bonds of acetates of phenols or alicyclic alcohols. Nevertheless, methyl esters of aromatic acids did not undergo hydrolysis. Alcohols were oxidized to ketones in a reversible reaction.

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6

Werstiuk, Nick Henry, Gwen Irene Wade, and Peter John Joseph Martin. "Facile H–D exchange of the bridgehead methyls of bicyclo[2.2.2]octan-2,5-diones. Evidence for a carbon analogue of the acyloin rearrangement." Canadian Journal of Chemistry 63, no. 9 (1985): 2582–83. http://dx.doi.org/10.1139/v85-428.

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Hexamethyltwistyl-2,5-dione 4 has been synthesized and its H–D exchange studied in t-BuOK/t-BuOD at 125 °C. We find that the bridgehead methyl at C-3 undergoes exchange 7 × 105 times faster than the bridgehead methyl of bicyclo[2.2.1]heptan-2-one (fenchone). This result, along with a previous study, establishes the first examples of the carbon analogue of the acyloin rearrangement of alicyclic systems.

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7

Bishop, R., and GH Lee. "Detection of Non-Conjugative Interactions in Rigid Cyclic Molecules by Using Carbon-13 N.M.R. Shift Values." Australian Journal of Chemistry 40, no. 2 (1987): 249. http://dx.doi.org/10.1071/ch9870249.

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In previous work, interaction between formally unconjugated unsaturated groups was detected by comparing the 13C n.m.r. shift values of the sp2 atoms of difunctional compounds with those of the corresponding monofunctional compounds. This procedure has now been used to investigate possible interactive effects in a range of rigid alicyclic systems where steric and conformational factors cannot be involved, namely, the 2,6-disubstituted adamantane (6), 4,8-disubstituted 2-thiaadamantane (7), 2,6-disubstituted noradamantane (8), and 2,5-disubstituted norbornane (9) systems. In each case interacti

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8

Umerzakova, М. B., R. B. Sarieva, and V. D. Kravtsova. "MODIFIED WITH VARIOUS ADDITIVES ARYLALYCLIC COPOLYIMIDES AND COMPOSITE FILMS BASED ON THEIR BASIS." Chemical Journal of Kazakhstan 3 (September 30, 2021): 19–35. http://dx.doi.org/10.51580/2021-1/2710-1185.36.

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lopment of arylalicyclic copolyimides based on alicyclic dianhydride, aromatic dianhydrides of benzophenone- and diphenyloxidetetracarboxylic acids with 4,4'-diaminodiphenyl oxide at various ratios of alicyclic and aromatic dianhydrides, as well as various compositions based on these copolymers with low- or other high-molecular compounds that enhance the characteristics of the polymer matrix. Composite films were formed from solutions of the obtained polymer mixtures, and their properties were studied. It was noted that at optimal ratio of components, the films have improved thermal and streng

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9

Charton, Marvin. "The Nature and Transmission of Substituent Electrical Effects in Alicyclic Solvolysis." Collection of Czechoslovak Chemical Communications 64, no. 11 (1999): 1849–76. http://dx.doi.org/10.1135/cccc19991849.

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The correlation of rate constants taken from the literature for 2-exo- and 2-endo-norbornyl derivatives substituted in positions 1, 4, 5-exo, 6-exo, 6-endo, and 7-anti with the triparametric LDR equation and relationships derived from it has been carried out. A delocalized (resonance) electrical effect has been found in all but the 4-substituted derivatives. The resonance effect may be somewhat greater when the leaving group is exo than when it is endo. Steric effects occur in the 6-endo-substituted derivatives. The transition state resembles a classical carbocation rather than the nonclassica

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10

Mahesh, V. K., Mamta Maheswari, Rakesh Sharma, and Rashmi Sharma. "Analogs of cannabinoids: synthesis of some 7H-indolo-, 5H-imidazolo, 7H-benzimidazolo[1,2-c] [1,3]benzoxazines – novel ring systems." Canadian Journal of Chemistry 63, no. 3 (1985): 632–35. http://dx.doi.org/10.1139/v85-103.

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Tetrahydrocannabinol 1, the active constituent of CannabissativaLinn, is a well-known CNS-active compound and introduction of a nitrogen atom at the ring junction of the pyran and alicyclic ring is of considerable interest. This prompted the synthesis of 7H-indolo[1,2-c] [1,3]-, 5H-imidazolo[1,2-C] [1,3],- and 7H-benzimidazolo[1,2-c] [1,3]-benzoxazine, a novel heterocyclic system. 2-(2′-Hydroxyphenyl) indoles, 2-(2′-hydroxyphenyl) imidazoles, and 2-(2′-hydroxyphenyl) benzimidazoles are suitable intermediates for the preparation of this type of benzoxazines, as the second heterocycle (ring B) c

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11

Murray, Jane S., Paul C. Redfern, Jorge M. Seminario, and Peter Politzer. "Anomalous energy effects in some aliphatic and alicyclic aza systems and their nitro derivatives." Journal of Physical Chemistry 94, no. 6 (1990): 2320–23. http://dx.doi.org/10.1021/j100369a024.

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12

Floriano, Belén, Eduardo Santero, and Francisca Reyes-Ramírez. "Biodegradation of Tetralin: Genomics, Gene Function and Regulation." Genes 10, no. 5 (2019): 339. http://dx.doi.org/10.3390/genes10050339.

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Tetralin (1,2,3,4-tetrahydonaphthalene) is a recalcitrant compound that consists of an aromatic and an alicyclic ring. It is found in crude oils, produced industrially from naphthalene or anthracene, and widely used as an organic solvent. Its toxicity is due to the alteration of biological membranes by its hydrophobic character and to the formation of toxic hydroperoxides. Two unrelated bacteria, Sphingopyxis granuli strain TFA and Rhodococcus sp. strain TFB were isolated from the same niche as able to grow on tetralin as the sole source of carbon and energy. In this review, we provide an over

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13

Sukhanov, Gennady T., Yulia V. Filippova, Yuri V. Gatilov, et al. "Energetic Materials Based on N-substituted 4(5)-nitro-1,2,3-triazoles." Materials 15, no. 3 (2022): 1119. http://dx.doi.org/10.3390/ma15031119.

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The regularities and synthetic potentialities of the alkylation of 4(5)-nitro-1,2,3-triazole in basic media were explored, and new energetic ionic and nitrotriazole-based coordination compounds were synthesized in this study. The reaction had a general nature and ended with the formation of N1-, N2-, and N3-alkylation products, regardless of the conditions and reagent nature (alkyl- or aryl halides, alkyl nitrates, dialkyl sulfates). This reaction offers broad opportunities for expanding the variability of substituents on the nitrotriazole ring in the series of primary and secondary aliphatic,

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14

Nowak, Paulina, Karolina Kucharska, and Marian Antoni Kaminski. "The New Test Procedure for Group-Type Composition of Base Oils of Lubricating Oils, Especially Emitted into the Environment." Energies 13, no. 15 (2020): 3772. http://dx.doi.org/10.3390/en13153772.

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Mineral base oil, a product of multistep fine refining of the relevant fractions from vacuum distillation of crude oil, is a main component of so-called mineral lubricating oils containing aliphatic and alicyclic substituted aromatic hydrocarbons, i.e., derivatives of benzene and biphenyl. Mineral lubricating oil is composed mostly of mineral base oil and a low amount of enriching additives, most often products of advanced organic chemical technology. The application of mineral lubricating oils in open cutting systems has a very negative impact on environment and on the operator’s health. This

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15

Li, Shuang Cui, and Chun Cheng Hao. "Molecular Dynamics Simulations of DGEBA/OSC Epoxy Composites for Improving Heat-Resistance and Elastic Modulus." ECS Journal of Solid State Science and Technology 11, no. 10 (2022): 103012. http://dx.doi.org/10.1149/2162-8777/ac972d.

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Thermal and mechanical properties of DGEBA/OSC epoxy composite polymers composed of both bisphenol A diglygde ether (DGEBA) and alicyclic epoxy resin (OSC) as co-polymerization monomers and 3,3-diaminodiphenyl sulfone (DDS) as curing agent are evaluated and investigated by molecular dynamics (MD) simulations, in which NPT ensembles and annealing cycles in a wide temperature range are utilized for modeling the thermodynamic equilibrium systems and heating processes. Glass transition and thermal-decomposition temperatures are calculated by linear fitting on the temperature dependence of elastic

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16

Kiss, Loránd, Márton Kardos, Csaba Vass та Ferenc Fülöp. "Application of Metathesis Reactions in the Synthesis and Transformations of Functionalized β-Amino Acid Derivatives". Synthesis 50, № 18 (2018): 3571–88. http://dx.doi.org/10.1055/s-0036-1591600.

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Because of their biological relevance, cyclic β-amino acids have generated increasing interest and had significant impact in drug research over the past two decades. Their preparation and further functionalization towards new types of molecular entities have received large interest in synthetic and medicinal chemistry. Various types of metathesis reactions, such as ring-opening (ROM), ring-closing (RCM), or cross metathesis (CM) are used widely for access to either alicyclic β-amino acids or other densely functionalized derivatives of this group of compounds. This account intends to provide an

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17

ODA, K., Y. FUKUZAWA, K. OHNO, M. MACHIDA, and Y. KANAOKA. "ChemInform Abstract: Photochemistry of the Nitrogen-Thiocarbonyl Systems. Part 21. Photoreaction of 1- and 3-Aralkyl Alicyclic Thioimides: Facile Synthesis of Various Azabicycloalkanes via Norrish Type II Process." ChemInform 24, no. 12 (2010): no. http://dx.doi.org/10.1002/chin.199312183.

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18

DRAGUTAN, V., I. DRAGUTAN, C. CONDEIU, and A. M. GLATZ. "ChemInform Abstract: Friedel-Crafts Chemistry in Alicyclic Systems. Part 5. Reaction of Cyclohexylidene- and 1-Cyclohexenylacetic Acids with Benzene in the Presence of AlCl3×CH3NO2 as the Catalyst." ChemInform 22, no. 44 (2010): no. http://dx.doi.org/10.1002/chin.199144137.

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19

Goranov, Aleksandar I., Andrew S. Wozniak, Kyle W. Bostick, Andrew R. Zimmerman, Siddhartha Mitra, and Patrick G. Hatcher. "Microbial labilization and diversification of pyrogenic dissolved organic matter." Biogeosciences 19, no. 5 (2022): 1491–514. http://dx.doi.org/10.5194/bg-19-1491-2022.

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Abstract. With the increased occurrence of wildfires around the world, interest in the chemistry of pyrogenic organic matter (pyOM) and its fate in the environment has increased. Upon leaching from soils by rain events, significant amounts of dissolved pyOM (pyDOM) enter the aquatic environment and interact with microbial communities that are essential for cycling organic matter within the different biogeochemical cycles. To evaluate the biodegradability of pyDOM, aqueous extracts of laboratory-produced biochars were incubated with soil microbes, and the molecular changes to the composition of

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20

Nosova, Natalia V., Daria D. Lezhnina, Daria D. Rubtsova, and Vladimir L. Gein. "Reaction of substituted 6-oxocyclohexane- 1,3-dicarboxamides with hydroxylamine." Butlerov Communications 63, no. 9 (2020): 31–34. http://dx.doi.org/10.37952/roi-jbc-01/20-63-9-31.

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Functionalized cyclohexanones are multifunctional highly reactive available substrates. They are convenient for the synthesis of new compounds, including practically significant ones. The presence of a 1,3-dicarbonyl fragment in their composition makes it possible to obtain various heterocyclic systems in reactions with binucleophilic reagents: indazoles, benzisoxazoles, and diazepines. The interaction of cyclohexanones functionalized with acetyl or alkoxycarbonyl substituents with hydroxylamine was previously studied. It was shown that, depending on the nature of the substituents, the reactio

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21

Freiherr von Richthofen, Carl-Georg, Bastian Feldscher, Kai-Alexander Lippert, Anja Stammler, Hartmut Bögge, and Thorsten Glaser. "Electronic and Molecular Structures of Heteroradialenes: A Combined Synthetic, Computational, Spectroscopic, and Structural Study Identifying IR Spectroscopy as a Simple but Powerful Experimental Probe." Zeitschrift für Naturforschung B 68, no. 1 (2013): 64–86. http://dx.doi.org/10.5560/znb.2013-2241.

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The vicinity of a hydrogen bond donor (O-H) and a hydrogen bond acceptor (C=O or C=N- R) in salicylaldehydes and ortho-Schiff bases results in significant structural variations compared to the monosubstituted derivatives that are reflected in the electronic structure and thus in the spectroscopic properties. This interplay between intramolecular hydrogen bonding and multicenter p- electron delocalization is the origin of the concept of resonance-assisted hydrogen bonding (RAHB). Herein, the complexity is extended from one hydrogen bond donor-acceptor pair in salicylaldehyde and ortho-Schiff ba

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22

Nonn, Melinda, László Drahos та Loránd Kiss. "A Convenient Synthesis of Some Phenyl‐Substituted Aliyclic β‐Amino Esters and β‐Lactams". ChemistrySelect 8, № 47 (2023). http://dx.doi.org/10.1002/slct.202303898.

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AbstractA convenient synthetic procedure has been developed for the access of phenyl‐substituted alicyclic β‐amino acid derivatives. The substrate‐directed palladium‐catalyzed cross‐coupling of phenylboronic acid with five‐ or six‐membered cycloalkene β‐amino esters and bicyclic β‐lactams in the presence of Selectfluor as oxidant provided phenyl‐substituted alicyclic β‐amino esters and azetidin‐2‐ones. Phenylations were investigated under various experimental conditions with different ligands and solvent systems. The structural architecture of the starting compounds and the position of their r

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23

Dong, Jiufeng, Li Li, Yujuan Niu, et al. "Scalable High‐Permittivity Polyimide Copolymer with Ultrahigh High‐Temperature Capacitive Performance Enabled by Molecular Engineering." Advanced Energy Materials, December 31, 2023. http://dx.doi.org/10.1002/aenm.202303732.

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AbstractPolymer capacitors are essential components of advanced electronic and power systems. However, the deficient high‐temperature capacitive performance of polymer dielectrics fails to meet the demand for harsh condition applications, due to the mutually restrictive relationships in permittivity (εr), glass transition temperature (Tg), and bandgap (Eg). Here, a modularized molecular engineering strategy is reported to enhance the high‐temperature capacitive performance of polymer dielectrics. First, the potential influences of multiple structural units on εr, Tg, and Eg of polymers are elu

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24

MURRAY, J. S., P. C. REDFERN, J. M. SEMINARIO, and P. POLITZER. "ChemInform Abstract: Anomalous Energy Effects in Some Aliphatic and Alicyclic Aza Systems and Their Nitro Derivatives." ChemInform 21, no. 26 (1990). http://dx.doi.org/10.1002/chin.199026063.

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25

Kim, Hye Won, Na Kyung Kim, Alex P. R. Phillips, et al. "Genomic insight and physiological characterization of thermoacidophilic Alicyclobacillus isolated from Yellowstone National Park." Frontiers in Microbiology 14 (September 26, 2023). http://dx.doi.org/10.3389/fmicb.2023.1232587.

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IntroductionAlicyclobacillus has been isolated from extreme environments such as hot springs, volcanoes, as well as pasteurized acidic beverages, because it can tolerate extreme temperatures and acidity. In our previous study, Alicyclobacillus was isolated during the enrichment of methane oxidizing bacteria from Yellowstone Hot Spring samples.MethodsPhysiological characterization and genomic exploration of two new Alicyclobacillus isolates, AL01A and AL05G, are the main focus of this study to identify their potential relationships with a thermoacidophilic methanotroph (Methylacidiphilum) isola

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