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Journal articles on the topic 'Amino catalyst'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Hill, C. A. S., N. S. Cetin, and N. Ozmen. "Potential Catalysts for the Acetylation of Wood." Holzforschung 54, no. 3 (2000): 269–72. http://dx.doi.org/10.1515/hf.2000.045.

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Summary The potential of several tertiary amine catalysts (pyridine, 4-dimethyl-amino pyridine, N-methyl pyrrolidine and N-methyl pyrrolidinone) for the acetylation of Corsican pine sapwood, using acetic anhydride, has been investigated. Rates of reaction were compared with non-catalysed acetylation using acetic anhydride. The hypernucleophile 4-dimethylamino pyridine was found to be the most effective catalyst of those studied. At a concentration of only 1% of the catalyst in acetic anhydride, a weight percent gain of 20% was realised, compared with 7% for the uncatalysed reaction, after 30 m

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2

Parasuraman, Perumalsamy, Zubeda Begum, Madhu Chennapuram, et al. "Simple organocatalyst component system for asymmetric hetero Diels–Alder reaction of isatins with enones." RSC Advances 10, no. 30 (2020): 17486–91. http://dx.doi.org/10.1039/d0ra03006f.

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A simple two catalysts component system of β-amino alcohols (catalyst) and amino acids (co-catalyst) works as an efficient organocatalysts in hetero Diels–Alder reaction of isatins with enones to afford chiral spirooxindole-tetrahydropyranones.

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3

Chabolla, S. A., C. W. Machan, J. Yin, et al. "Bio-inspired CO2reduction by a rhenium tricarbonyl bipyridine-based catalyst appended to amino acids and peptidic platforms: incorporating proton relays and hydrogen-bonding functional groups." Faraday Discussions 198 (2017): 279–300. http://dx.doi.org/10.1039/c7fd00003k.

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Herein, we report a new approach to bio-inspired catalyst design. The molecular catalyst employed in these studies is based on the robust and selective Re(bpy)(CO)<sub>3</sub>Cl-type (bpy = 2,2′-bipyridine) homogeneous catalysts, which have been extensively studied for their ability to reduce CO<sub>2</sub>electrochemically or photochemically in the presence of a photosensitizer. These catalysts can be highly active photocatalysts in their own right. In this work, the bipyridine ligand was modified with amino acids and synthetic peptides. These results build on earlier findings wherein the bip

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4

Latypova, Adele R., Maxim D. Lebedev, Evgeniy V. Rumyantsev, et al. "Amino-Modified Silica as Effective Support of the Palladium Catalyst for 4-Nitroaniline Hydrogenation." Catalysts 10, no. 4 (2020): 375. http://dx.doi.org/10.3390/catal10040375.

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The article describes the synthesis of aminoorgano-functionalized silica as a prospective material for catalysis application. The amino groups have electron donor properties which are valuable for the metal chemical state of palladium. Therefore, the presence of electron donor groups is important for increasing catalysts’ stability. The research is devoted to the investigation of silica amino-modified support influence on the activity and stability of palladium species in 4-nitroaniline hydrogenation process. A series of catalysts with different supports such as SiO2, SiO2-C3H6-NH2 (amino-func

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5

Fadlalla, Mohamed, Glenn Maguire, and Holger Friedrich. "The Heterogeneous Aminohydroxylation Reaction Using Hydrotalcite-Like Catalysts Containing Osmium." Catalysts 8, no. 11 (2018): 547. http://dx.doi.org/10.3390/catal8110547.

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The aminohydroxylation reaction of olefins is a key organic transformation reaction, typically carried out homogeneously with toxic and expensive osmium (Os) catalysts. Therefore, heterogenisation of this reaction can unlock its industrial potential by allowing reusability of the catalyst. Os–Zn–Al hydrotalcite-like compounds (HTlcs), as potential heterogeneous aminohydroxylation catalysts, were synthesised by the co-precipitation method and characterised by several techniques. Reaction parameters (i.e., solvent system, reaction temperature, and catalyst structure) were optimized with cyclohex

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6

Michrowska, Anna, and Karol Grela. "Quest for the ideal olefin metathesis catalyst." Pure and Applied Chemistry 80, no. 1 (2008): 31–43. http://dx.doi.org/10.1351/pac200880010031.

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Attempts were made to create a catalyst that approaches Gladysz's vision of an "ideal catalyst". Modifications of the Hoveyda-Grubbs catalyst were carried out with the aim to increase its activity and broaden the scope of its applicability to challenging metathesis reactions. This was done by introduction of an electron-withdrawing substituent on the isopropoxybenzylidene group in order to diminish the donor properties of the oxygen atom. The resulting stable and easily accessible nitro-substituted Hoveyda-Grubbs catalyst has found a number of successful applications in various research and in

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7

Kim, Seonghee, Hyun Park, and Oi Lun Li. "Cobalt Nanoparticles on Plasma-Controlled Nitrogen-Doped Carbon as High-Performance ORR Electrocatalyst for Primary Zn-Air Battery." Nanomaterials 10, no. 2 (2020): 223. http://dx.doi.org/10.3390/nano10020223.

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Metal–air batteries and fuel cells have attracted much attention as powerful candidates for a renewable energy conversion system for the last few decades. However, the high cost and low durability of platinum-based catalysts used to enhance sluggish oxygen reduction reaction (ORR) at air electrodes prevents its wide application to industry. In this work, we applied a plasma process to synthesize cobalt nanoparticles catalysts on nitrogen-doped carbon support with controllable quaternary-N and amino-N structure. In the electrochemical test, the quaternary-N and amino-N-doped carbon (Q-A)/Co cat

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8

Al-Harbi, Laila M., Manal M. Khowdiary, H. S. Nassar, et al. "Experimental and theoretical investigation to improvement biodiesel production using green catalyst based on cellulose derivatives." Materials Express 11, no. 1 (2021): 142–51. http://dx.doi.org/10.1166/mex.2021.1876.

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The present study aimed to enhancement production of the biodiesel process using new green catalyst. The obtained compounds were established using diverse spectroscopic data. These molecules were evaluated as catalyst in production process. The biodiesel yield was 93% in case of copper complex catalyst, while the amino acid catalyst give 96% yield. To get clear insight for catalysts properties, we measured surface activity and simulating the chemical reactivity using HF quantum calculation. The obtained data summarize that using the prepared catalyst lowering the biodiesel process cost through

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9

Depreux, P., and A. Marcincal-Lefebvre. "Application des conditions de réaction par transfert de phase à la synthèse d'amino-éthers dérivés du trans phénoxy-2 cyclohexanol." Canadian Journal of Chemistry 64, no. 3 (1986): 626–32. http://dx.doi.org/10.1139/v86-101.

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Amino-ethers of trans-2-phenoxycyclohexanol were prepared by methods involving anhydrous conditions (sodium alkoxides in xylene) or phase transfer catalysis conditions (liquid–liquid or solid–liquid two-phase systems). Various factors were optimized. In the liquid–liquid two-phase system, when no catalyst was added, reaction proceeds with comparable or even better yields than with some PTC catalysts, a quaternary salt being formed insitu. It was shown that the deprotonation of ROH takes place at the interface, since there was no OH− extraction in organic medium and the yield depends on the sti

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10

Guo, Hong Qi, Gong Yan, Ming Qing Chen, and Shi Rong Liu. "Assembling of 12-Tungstophosphoric Acid into Amino-Modified SBA-15 and its Catalytic Performance." Advanced Materials Research 465 (February 2012): 224–28. http://dx.doi.org/10.4028/www.scientific.net/amr.465.224.

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12-tungstophosphoric acid was supported on amine-modified SBA-15 by impregnation. The structure and properties of the catalyst were characterized by FT-IR spectroscopy, X-ray diffraction, N2 adsorption-desorption, TEM,Raman spectra and NH3–TPD technology.the result confirmed the mesostructure for SBA-15 and the Keggin structure of the heteropolyanions was preserved. The tungstophosphoric acid can disperse in the pore of the support SBA-15/NH2, but the acidity of the catalyst reduced. The catalytic activities of the catalysts were evaluated for the esterification reaction of ethyl acetoacetate

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11

Maleki, Behrooz, and Safoora Sheikh. "Nano polypropylenimine dendrimer (DAB-PPI-G1): as a novel nano basic-polymer catalyst for one-pot synthesis of 2-amino-2-chromene derivatives." RSC Advances 5, no. 54 (2015): 42997–3005. http://dx.doi.org/10.1039/c5ra04458h.

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12

Nikoshvili, Linda, Elena S. Bakhvalova, Alexey V. Bykov, et al. "Study of Deactivation in Suzuki Reaction of Polymer-Stabilized Pd Nanocatalysts." Processes 8, no. 12 (2020): 1653. http://dx.doi.org/10.3390/pr8121653.

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This work is addressed to the phenomenon of catalyst deactivation taking place during the repeated uses in the reaction of Suzuki-Miyaura (S-M) cross-coupling, which is widely applied in industry for C-C bond formation. Ligandless catalysts based on Pd(0) NPs supported on hyper-cross-linked polystyrene (HPS) of two types (non-functionalized and bearing tertiary amino groups) were studied in a model S-M reaction between 4-bromoanisole and phenylboronic acid. Synthesized catalysts were shown to be highly active under mild reaction conditions. HPS allows stabilization of Pd(0) NPs and prevents th

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13

Hiremath, Prashant B., and Kantharaju Kamanna. "A Microwave Accelerated Sustainable Approach for the Synthesis of 2-amino-4H-chromenes Catalysed by WEPPA: A Green Strategy." Current Microwave Chemistry 6, no. 1 (2019): 30–43. http://dx.doi.org/10.2174/2213335606666190820091029.

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Background: The agricultural wastes as a source offer an excellent alternative to replace many toxic and environmentally hazardous catalysts, due to their least toxicity, ease of biodegradability, and ability to act as a greener catalytic medium. Some of the agro-waste based catalysts reported are BFE, WERSA, WEB, and WEPBA. 2-Amino-4H-chromene derivatives are promising biologically potent heterocyclic compounds, due to their medicinal applications such as antimicrobial, anti-inflammatory, antibacterial, antiviral, anticancer, antidiuretic, anticoagulant and antianaphylactic activities. The pr

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14

Zhou, Ling, Chong Kiat Tan, Xiaojian Jiang, Feng Chen, and Ying-Yeung Yeung. "Asymmetric Bromolactonization Using Amino-thiocarbamate Catalyst." Journal of the American Chemical Society 132, no. 44 (2010): 15474–76. http://dx.doi.org/10.1021/ja1048972.

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15

Li, Mao-Lin, Jin-Han Yu, Yi-Hao Li, Shou-Fei Zhu, and Qi-Lin Zhou. "Highly enantioselective carbene insertion into N–H bonds of aliphatic amines." Science 366, no. 6468 (2019): 990–94. http://dx.doi.org/10.1126/science.aaw9939.

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Aliphatic amines strongly coordinate, and therefore easily inhibit, the activity of transition-metal catalysts, posing a marked challenge to nitrogen-hydrogen (N–H) insertion reactions. Here, we report highly enantioselective carbene insertion into N–H bonds of aliphatic amines using two catalysts in tandem: an achiral copper complex and chiral amino-thiourea. Coordination by a homoscorpionate ligand protects the copper center that activates the carbene precursor. The chiral amino-thiourea catalyst then promotes enantioselective proton transfer to generate the stereocenter of the insertion pro

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16

Jackson, WR, P. Perlmutter, and AJ Smallridge. "The Stereochemistry of Organometallic Compounds. XXXII. Hydrocyanation of Derivatives of Amino Alkynes." Australian Journal of Chemistry 41, no. 8 (1988): 1201. http://dx.doi.org/10.1071/ch9881201.

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The hydrocyanation of a range of amino alkyne derivatives has been studied by using nickel-based catalyst systems. The phthalimido derivatives have been shown to give good yields of unsaturated cyano amine derivatives, and some of these have been converted into both saturated and unsaturated amino acids.

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17

Saravanan, S., Noor-ul H. Khan, Ajay Jakhar, et al. "Enantioselective Strecker reaction of aldimines using potassium cyanide catalyzed by a recyclable macrocyclic V(v) salen complex." RSC Advances 5, no. 121 (2015): 99951–58. http://dx.doi.org/10.1039/c5ra18914d.

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Chiral dimeric V(v) salen complexes have been synthesized and used as catalysts for asymmetric Strecker reaction of N-benzylimines using both KCN to produce chiral α-amino nitrile. The catalyst was recycled upto five times without loss in its activity.

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18

Yue, Shuang, Qian Song, Shuliang Zang, Guichun Deng, and Jun Li. "Amino-Functional Ionic Liquids as Efficient Catalysts for the Cycloaddition of Carbon Dioxide to Yield Cyclic Carbonates: Catalytic and Kinetic Investigation." Australian Journal of Chemistry 71, no. 6 (2018): 407. http://dx.doi.org/10.1071/ch17656.

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Various amino-functional ionic liquids were developed as homogeneous catalysts for the cycloaddition of carbon dioxide to different epoxides yielding the corresponding cyclic carbonates under metal- and solvent-free conditions. The effects of reaction temperature, reaction time, CO2 pressure, and the amount of catalyst on the cycloaddition reaction were investigated. The catalysts could be easily recovered after the reaction and then reused at least eight times without noticeable loss of activity and selectivity. Reaction kinetic studies were undertaken, the reaction was apparently first order

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19

Zhao, Jing, Xiaorui Yang, Wei Wang та ін. "Efficient Sorbitol Producing Process through Glucose Hydrogenation Catalyzed by Ru Supported Amino Poly (Styrene-co-Maleic) Polymer (ASMA) Encapsulated on γ-Al2O3". Catalysts 10, № 9 (2020): 1068. http://dx.doi.org/10.3390/catal10091068.

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In this work, a core-shell-like sphere ruthenium catalyst, named as 5%Ru/γ-Al2O3@ASMA, has been successfully synthesized through impregnating the ruthenium nanoparticles (NPs) on the surface of the amino poly (styrene-co-maleic) polymer (ASMA) encapsulating γ-Al2O3 pellet support. The interaction between the Ru cations and the electro-donating polymer shell rich in hydroxyl and amino groups through the coordination bond would guarantee that the Ru NPs can be highly dispersed and firmly embedded on the surface of the support. In addition, the solid sphere γ-Al2O3 pellet could serve as the core

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20

Vagkidis, Nikolaos, Alexander J. Brown, and Paul A. Clarke. "Evaluation of Amino Nitriles and an Amino Imidate as Organocatalysts in Aldol Reactions." Synthesis 51, no. 21 (2019): 4106–12. http://dx.doi.org/10.1055/s-0039-1690150.

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The efficiency of l-valine and l-proline nitriles and a tert-butyl l-proline imidate as organocatalysts for the aldol reaction have been evaluated. l-Valine nitrile was found to be a syn-selective catalyst, while l-proline nitrile was found to be anti-selective, and gave products in modest to good enantioselectivities. tert-Butyl l-proline imidate was found to be a very efficient catalyst in terms of conversion of starting reagents to products, and gave good anti-selectivity. The enantioselectivity of the tert-butyl l-proline imidate was found to be good to excellent, with products being form

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21

Mahmoodi, Niyaz Mohammad, Mina Oveisi, Mokhtar Alina Asli, Mohammad Ali Rezvani, and Amin Valipour. "Bi-amino surface functionalized polyoxometalate nanocomposite as an environmentally friendly catalyst: synthesis and dye degradation." Water Science and Technology 75, no. 10 (2017): 2381–89. http://dx.doi.org/10.2166/wst.2017.131.

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In this paper, cobalt ferrite magnetic nanoparticle was modified by N-(2-aminoethyl)-3-(trimethoxysilyl) propyl amine. Polyoxometalate was immobilized on the modified bi-amino surface functionalized nanoparticle to prepare the environmentally friendly catalyst nanoparticle (EFCN). The synthesized EFCN was characterized using Fourier transform infrared, scanning electron microscopy and X-ray powder diffraction. The EFCN was used for photocatalytic dye degradation. Acid Red 18 and Direct Red 81 were used as model dyes. The effect of catalyst dosage, dye concentration and salt on dye degradation

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22

Zhou, Jingwei, Lamei Li, Songping Wang, Ming Yan, and Wentao Wei. "Catalyst-free photodecarbonylation of ortho-amino benzaldehyde." Green Chemistry 22, no. 11 (2020): 3421–26. http://dx.doi.org/10.1039/d0gc01256d.

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23

Yaltaghian-Khiabani, Nafiseh, Shahrzad Abdolmohammadi, and Sepehr Sadegh-Samiei. "Aqueous Media Preparation of Pyrido[d]pyrimidines Over Calcined TiO2- SiO2 Nanocomposite as an Efficient Catalyst at Ambient Temperature." Letters in Organic Chemistry 16, no. 11 (2019): 915–21. http://dx.doi.org/10.2174/1570178616666181210102146.

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Pyridopyrimidines represent a highly important class of compounds which exhibit a wide spectrum of biological properties. Nanoscale metal oxide catalysts have been extensively studied for their application in organic reactions owing to their special features such as high surface area and pore sizes as supports. Titanium dioxide nanoparticles (TiO2 NPs) are an attractive candidate for readily available cheap nanocatalysts, due to their unique properties such as being non-toxic, moisture stable and reusable catalyst. 7-amino-2,4-dioxo-5-aryl-1,2,3,4-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitri

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Thirumeni, Subramanian, Choumini Balasanthiran, and Grigoriy Sereda. "The Catalytic Activity of TiO2 Toward a Multicomponent Reaction Depends on its Morphology, Mechanoactivation and Presence of Visible Light." Journal of Photocatalysis 1, no. 1 (2020): 37–42. http://dx.doi.org/10.2174/2665976x01666200128150101.

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Aims: Test the hypothesis that the catalytic activity of TiO2 nanoparticles towards a liquidphase or mechanoactivated multicomponent reaction can be tuned by visible light and the shape of nanoparticles. Background: Catalytic multicomponent reactions have been proven to be excellent synthetic approaches to a series of biologically relevant compounds including 2-amino-4H-benzo[b]pyrans. However, the potential photocatalytic activity and structural diversity of nanostructured catalysts remained underutilized in the design of new catalytic systems. Objective: Harness the photocatalytic potential

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25

Jawiczuk, Magdalena, Anna Marczyk, and Bartosz Trzaskowski. "Decomposition of Ruthenium Olefin Metathesis Catalyst." Catalysts 10, no. 8 (2020): 887. http://dx.doi.org/10.3390/catal10080887.

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Ruthenium olefin metathesis catalysts are one of the most commonly used class of catalysts. There are multiple reviews on their uses in various branches of chemistry and other sciences but a detailed review of their decomposition is missing, despite a large number of recent and important advances in this field. In particular, in the last five years several new mechanism of decomposition, both olefin-driven as well as induced by external agents, have been suggested and used to explain differences in the decomposition rates and the metathesis activities of both standard, N-heterocyclic carbene-b

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26

Park and Lee. "Kinetic Study of CO2 Hydration by Small-Molecule Catalysts with A Second Coordination Sphere that Mimic the Effect of the Thr-199 Residue of Carbonic Anhydrase." Biomimetics 4, no. 4 (2019): 66. http://dx.doi.org/10.3390/biomimetics4040066.

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Zinc complexes were synthesized as catalysts that mimic the ability of carbonic anhydrase (CA) for the CO2 hydration reaction (H2O + CO2 → H+ + HCO3-). For these complexes, a tris(2-pyridylmethyl)amine (TPA) ligand mimicking only the active site, and a 6-((bis(pyridin-2-ylmethyl)amino)methyl)pyridin-2-ol (TPA-OH) ligand mimicking the hydrogen-bonding network of the secondary coordination sphere of CA were used. Potentiometric pH titration was used to determine the deprotonation ability of the Zn complexes, and their pKa values were found to be 8.0 and 6.8, respectively. Stopped-flow spectropho

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27

Dogari, Haniyeh, Fereshte Hassanzadeh-Afruzi, and Ali Maleki. "ZnFe2O4@dimethylglyoxime: Preparation and Catalyst Application in the Synthesis of 2-Amino-tetrahydro-4H-chromene-3-carbonitrile Derivatives." Cells 3, no. 1 (2020): 89. http://dx.doi.org/10.3390/ecsoc-24-08287.

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Hybrid materials constructed from two or more constituents provide new features and distinctive applications which not found in the single-part material. Spinel ferrites with the general formula of AB2O4, where A denotes divalent ions and B represents trivalent ions, appeared as efficient catalysts for the synthesis of organic compounds. These magnetic nanoparticles have both the Lewis acid and the Lewis base sites in their structure. In the present study, ZnFe2O4 was prepared and modified with dimethylglyoxime to obtain a magnetic ZnFe2O4@dimethylglyoxime hybrid catalyst. Dimethylglyoxime is

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28

Fan, Guozhi, Hanjun Zhang, Siqing Cheng, Zhandong Ren, Zhijun Hu, and Zilan Wang. "Lewis Acid-Promoted Suzuki Reaction using Palladium Chloride Anchored on a Polymer as a Catalyst." Australian Journal of Chemistry 61, no. 8 (2008): 610. http://dx.doi.org/10.1071/ch08066.

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Palladium chloride anchored on polystyrene modified by 5-amino-1,10-phenanthroline was prepared and used as an efficient recoverable catalyst for Suzuki cross-coupling reactions. The heterogeneous catalysts can be easily separated from the reaction mixture and reused for five cycles without significant Pd leaching and loss of catalytic activity. Rate enhancement in the Suzuki reaction by Lewis acids was also studied.

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29

Zhang, Yunlei, Pei Jin, Minjia Meng, Lin Gao, Meng Liu, and Yongsheng Yan. "Acid-Base Bifunctional Metal-Organic Frameworks: Green Synthesis and Application in One-Pot Glucose to 5-HMF Conversion." Nano 13, no. 11 (2018): 1850132. http://dx.doi.org/10.1142/s1793292018501321.

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The direct synthesis of metal-organic frameworks (MOFs) with acidic and basic active sites is challenging due to the introduction of functional groups by post-functionalization method often jeopardize the framework integrity. Herein, we report the direct synthesis of acid-base bi-functional MOFs with tuning acid-base strength. Employing modulated hydrothermal (MHT) approach, microporous MOFs named UiO-66-NH2 was prepared. Through the ring-opening reaction of 1,3-propanesultone with amino group, UiO-66-NH2-SO3H-type catalysts can be obtained. The synthesized catalysts were well characterized an

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30

Yao, Guangkai, Zhi-Xiang Zhang, Cheng-Bei Zhang, Han-Hong Xu, and Ri-Yuan Tang. "HFIP-Promoted Bischler Indole Synthesis under Microwave Irradiation." Molecules 23, no. 12 (2018): 3317. http://dx.doi.org/10.3390/molecules23123317.

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1,1,1,3,3,3-Hexafluoropropan-2-ol (HFIP) was found to be effective for the Bischler indole synthesis under microwave irradiation in the absence of a metal catalyst. Under the catalysis of HFIP, a wide range of α-amino arylacetones were successfully transformed into indole derivatives with moderate to good yields.

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Kim, Seonghee, Shuhei Kato, Takahiro Ishizaki, Oi Lun Li, and Jun Kang. "Transition Metal (Fe, Co, Ni) Nanoparticles on Selective Amino-N-Doped Carbon as High-Performance Oxygen Reduction Reaction Electrocatalyst." Nanomaterials 9, no. 5 (2019): 742. http://dx.doi.org/10.3390/nano9050742.

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Metal-air batteries are attracting increasing attention as a superior renewable energy conversion device due to their high performance and strong potential. However, the high cost and low stability of the current Pt catalyst is the main obstacle preventing wide industrial application. In this work, we applied a plasma process to fabricate aniline and a transition metals electrode (Fe, Co, Ni) as the carbon-nitrogen and the metal nanoparticle (NP) precursors, respectively, for selective metal/amino-N-doped carbon catalysts. All three as-synthesized catalysts exhibited dominant amino-N as the ma

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32

Ossowicz, Paula, Zbigniew Rozwadowski, Marcin Gano, and Ewa Janus. "Efficient method for Knoevenagel condensation in aqueous solution of amino acid ionic liquids (AAILs)." Polish Journal of Chemical Technology 18, no. 4 (2016): 90–95. http://dx.doi.org/10.1515/pjct-2016-0076.

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Abstract This work reports on the use of the amino acid ionic liquids (AAILs) which have been used as catalysts in Knoevenagel condensation of various aldehydes with malononitrile. For research we use tetrabutylammonium ionic liquids based on eight natural amino acids. The reaction was carried out in an aqueous medium. Using water as solvent provided efficient and simple method of isolation of pure product with high yield. Moreover, amino acid ionic liquid dissolved in water could be reused many times without any loss of its catalytic activity. The influence of the anion was studied. Moreover

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CHIR, Jiunly, Stephen WITHERS, Chin-Feng WAN та Yaw-Kuen LI. "Identification of the two essential groups in the family 3 β-glucosidase from Flavobacterium meningosepticum by labelling and tandem mass spectrometric analysis". Biochemical Journal 365, № 3 (2002): 857–63. http://dx.doi.org/10.1042/bj20020186.

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β-Glucosidase from Flavobacterium meningosepticum (Fbgl) catalyses the hydrolysis of β-1,4-glucosidic bonds via a two-step double-displacement mechanism in which two amino acid residues act as nucleophile and acid/base catalyst. Definitive identification of these two residues is provided by the two active-site-directed inactivators, 2′,4′-dinitrophenyl-2-deoxy-2-fluoro-β-d-glucoside (2FDNPG) and N-bromoacetyl-β-d-glucosylamine (NBGN), which stoichiometrically label the nucleophile and the acid/base catalyst of Fbgl, respectively. Pseudo-first-order inactivation rate constants (ki) of 0.25±0.01

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34

Zhou, Wen-Jun, Da-Gang Yu, Yong-Yuan Gui, and Xiao-Wang Chen. "Arylation of Amide and Urea C(sp3)–H Bonds with Aryl Tosylates Generated In Situ from Phenols." Synlett 28, no. 19 (2017): 2581–86. http://dx.doi.org/10.1055/s-0036-1589126.

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The arylation of amide and urea C(sp3)–H bonds with aryl tosylates generated in situ from phenols has been realized at room temperature by combining visible-light-photoredox catalysis, hydrogen-atom-transfer catalysis, and nickel catalysis. This streamlined protocol permits rapid functionalization of phenols and direct transformation of α-amino C(sp3)–H bonds. The C(sp3)–H arylation products are obtained in high yields with good functional-group tolerance at low catalyst loadings.

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35

Tazari, Mohsen, and Hamzeh Kiyani. "Expeditious Synthesis of 2-Amino-4H-chromenes and 2-Amino-4H-pyran-3- carboxylates Promoted by Sodium Malonate." Current Organic Synthesis 16, no. 5 (2019): 793–800. http://dx.doi.org/10.2174/1570179416666190415105818.

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Background: Chromenes and pyran annulated heterocycles are the most common frameworks existing in various biologically active molecules. Due to their beneficial and biological properties, they are eyecatching synthetic targets in the arsenal of organic chemistry. Thus, finding green and efficient methods, as well as searching for a new catalyst for the synthesis of these heterocycles is of interest to organic chemistry researchers. Objective: Sodium malonate as a readily available catalyst was employed aimed at the multicomponent synthesis of numerous 2-amino-4H-chromenes and 2-amino-4H-pyrans

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Najar, Asef H., Zinatossadat Hossaini, Shahrzad Abdolmohammadi та Daryoush Zareyee. "ZnO-nanorods Promoted Synthesis of α-amino Nitrile Benzofuran Derivatives using One-pot Multicomponent Reaction of Isocyanides". Combinatorial Chemistry & High Throughput Screening 23, № 4 (2020): 345–55. http://dx.doi.org/10.2174/1386207323666200219124625.

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Aims & Objective: In this work ZnO-nanorod (ZnO-NR) as reusable catalyst promoted Strecker-type reaction of 2,4-dihydroxyacetophenone, isopropenylacetylene, trimethylsilyl cyanide (TMSCN), primary amines and isocyanides at ambient temperature under solvent-free conditions and produced α-amino nitriles benzofuran derivatives in high yields. These synthesized compounds may have antioxidant ability. Materials and Methods: ZnO-NRs in these reactions were prepared according to reported article. 2,4-dihydroxyacetophenone 1 (2 mmol) and isopropenylacetylene 2 (2 mmol) were mixed and stirred for 3

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Takemoto, Yoshiji, Taryn March, Akihiro Murata та Yusuke Kobayashi. "Enantioselective Synthesis of anti-β-Hydroxy-α-amino Esters via an Organocatalyzed Decarboxylative Aldol Reaction". Synlett 28, № 11 (2017): 1295–99. http://dx.doi.org/10.1055/s-0036-1588141.

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The first enantioselective decarboxylative aldol addition with α-amido-substituted malonic acid half oxyesters (MAHOs) is described. The combined use of a newly designed bifunctional sulfonamide catalyst with pentafluorobenzoic acid as an additive afforded the β-hydroxy-α-amino acid derivatives in moderate to high yields and with high enantioselectivities.

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38

Zhou, Ling, Chong Kiat Tan, Xiaojian Jiang, Feng Chen, and Ying-Yeung Yeung. "ChemInform Abstract: Asymmetric Bromolactonization Using Amino-thiocarbamate Catalyst." ChemInform 42, no. 15 (2011): no. http://dx.doi.org/10.1002/chin.201115109.

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Sachdeva, Harshita, Diksha Dwivedi, and Rekha Saroj. "Alum Catalyzed Simple, Efficient, and Green Synthesis of 2-[3-Amino-5-methyl-5-(pyridin-3-yl)-1,5-dihydro-4H-1,2,4-triazol-4-yl]propanoic Acid Derivatives in Aqueous Media." Scientific World Journal 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/716389.

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Alum (KAl(SO4)2·12H2O) is an inexpensive, efficient, and nontoxic catalyst used for the synthesis of 2-[3-amino-5-methyl-5-(pyridin-3-yl)-1,5-dihydro-4H-1,2,4-triazol-4-yl]propanoic acid derivatives in aqueous media by the reaction of 3-acetyl pyridine(1), amino acids(2)/(6), and thiosemicarbazide(4)at 80°C. This methodology offers significant improvements for the synthesis of products with regards to the yield of products, simplicity in operation, and green aspects by avoiding toxic catalysts which uphold the motto of green chemistry. Synthesized compounds have been characterized by FT-IR,13C

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Wang, Xiao Hui, Xi Hua Du, and Li Min Dong. "Synthesis and Properties of Esters of Amino Acids' Composite and Palmityl Alcohol." Advanced Materials Research 900 (February 2014): 301–5. http://dx.doi.org/10.4028/www.scientific.net/amr.900.301.

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Concentrates of composite of amino acids based on hydrolysis of rapeseed meal were used to prepare esters of amino acids composite and palmityl alcohol. Effects of the ratio of raw materials, reaction time, water carrying agent and catalyst on synthesis of products were investigated. Surface-activity of these products have been also characterized. The optimums of reaction conditions were obtained. The results showed that molar ratio of palmityl alcohol and amino acids composite was 1:2, and toluene was as water carrying agent, and reaction temperature was 110°C-125°C, and the reaction time was

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Peddinti, Rama, and Arun Sharma. "Direct Asymmetric Mannich Reaction Catalyzed by a d-Glucosamine-Derived Organocatalyst." Synlett 29, no. 05 (2018): 630–34. http://dx.doi.org/10.1055/s-0036-1591740.

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Sugar-based primary amines have been employed as organocatalysts for the direct asymmetric Mannich reaction. By catalyst-screening experiments, we observed that catalysts bearing a hydroxy function at C-3 actively participated in the reaction, possibly through hydrogen bonding with the imine generated in situ, to provide β-amino carbonyl compounds with better diastereoselectivity and enantioselectivity. All the products were obtained in good to excellent enantiomeric excess.

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Yamaguchi, Shigenori, Hidenobu Komeda та Yasuhisa Asano. "New Enzymatic Method of Chiral Amino Acid Synthesis by Dynamic Kinetic Resolution of Amino Acid Amides: Use of Stereoselective Amino Acid Amidases in the Presence of α-Amino-ε-Caprolactam Racemase". Applied and Environmental Microbiology 73, № 16 (2007): 5370–73. http://dx.doi.org/10.1128/aem.00807-07.

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ABSTRACT d- and l-amino acids were produced from l- and d-amino acid amides by d-aminopeptidase from Ochrobactrum anthropi C1-38 and l-amino acid amidase from Pseudomonas azotoformans IAM 1603, respectively, in the presence of α-amino-ε-caprolactam racemase from Achromobacter obae as the catalyst by dynamic kinetic resolution of amino acid amides.

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Devkate, Santosh S., Arvind S. Burungale, Ashok S. Pise та Sunil D. Jadhav. "Active Copper Catalyzed Regioselective Ring Opening of Epoxides by Heterocyclic Amines: An Efficient Protocol for Synthesis of β-Amino Alcohols". Asian Journal of Organic & Medicinal Chemistry 4, № 3 (2019): 194–99. http://dx.doi.org/10.14233/ajomc.2019.ajomc-p213.

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The regioselective epoxide ring opening at less substituted carbon atom of epoxide were reported by nucleophiles like heterocyclic amines which gives well known 1,2-difunctionalized amino alcohols. These are present in many synthetic as well as natural products. The ring opening of epoxide is achieved by cleavage with amines in presence of copper(0) as a catalyst. It is observed that the lithium napthalenide reduction of copper(I) produces a highly reactive form of copper(0) that acts as a catalyst for ring opening of epoxides with an amine.

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Moirangthem, Soniya D., Bhavna Thingom, and Warjeet S. Laitonjam. "Cd-proline Complex Catalyzed Direct one-Pot three Component Mannich Reaction in Water Medium." JOURNAL OF ADVANCES IN CHEMISTRY 7, no. 1 (2011): 1160–68. http://dx.doi.org/10.24297/jac.v7i1.970.

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Metal-proline complexes of various metals like Zn, Cd, Hg, and Pb were found to be good catalysts for direct Mannich reaction in water medium at room temperature, smoothly affording the β-amino carbonyl compounds in excellent yields. Among the catalyst cadmium-proline complex gave high yield in lesser time. All the catalysts were easily separated from the reaction mixture by water extraction and among this cadmium -proline complex was found to be most stable and can be recycled five times without losing its catalytic activity.

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Tooley, Christian, Charles Gasperoni, Sabrina Marnoto, and Jeffrey Halpern. "Evaluation of Metal Oxide Surface Catalysts for the Electrochemical Activation of Amino Acids." Sensors 18, no. 9 (2018): 3144. http://dx.doi.org/10.3390/s18093144.

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Electrochemical detection of amino acids is important due to their correlation with certain diseases; however, most amino acids require a catalyst to electrochemically activate. One common catalyst for electrochemical detection of amino acids are metal oxides. Metal oxide nanoparticles were electrodeposited onto glassy carbon and platinum working electrodes. Cyclic voltammetry (CV) experiments in a flow cell were performed to evaluate the sensors’ ability to detect arginine, alanine, serine, and valine at micromolar and nanomolar concentrations as high as 4 mM. Solutions were prepared in phosp

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Teimouri, Abbas, та Leila Ghorbanian. "One-pot Three-component Synthesis of β-amino Carbonyl Compounds Using Nanocrystalline Solid Acid Catalyst". International Journal of Green Nanotechnology 1 (1 січня 2013): 194308921350716. http://dx.doi.org/10.1177/1943089213507161.

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This study presents a simple highly versatile and efficient synthesis of various β-amino carbonyl compounds in the Mannich reaction of acetophenone with aromatic aldehydes and aromatic amines in the presence of nanosulfated zirconia, nanostructured ZnO, nano-γ-alumina, and nano-ZSM-5 zeolites as the catalyst in ethanol at moderate temperature. The optical properties of the nanostructured organic molecules were studied. The advantages of methods are short reaction times, milder conditions, easy workup, and purification of products by nonchromatographic methods. The catalysts can be recovered fo

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Ludyn, Anatolij, Volodymyr Reutskyy, Viktor Reutskyy, and Yurij Hrynchuk. "Influence of Amino Acids and Alcohols on Catalytic Oxidation of Cyclohexane." Chemistry & Chemical Technology 15, no. 3 (2021): 352–58. http://dx.doi.org/10.23939/chcht15.03.352.

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Conducted experiments and collected data show that use of catalytic systems that contain individual amino acids and industrial catalyst – solution of cobalt naphtenate with cyclohexanone – have certain influence on the process of liquid-phase homogeneous oxidation of cyclohexane. The results of spectral studies of binary catalytic systems based on NC using additives of different nature (alcohols and nitrogen-containing modifiers) allow us to propose structural formulas of catalytic complexes.

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Fan, Guo Zhi, Zhen Xiao Duan, and Min Wang. "Suzuki Reaction Catalyzed by Pd(II) Anchored on Polymer in Supercritical Carbon Dioxide." Advanced Materials Research 466-467 (February 2012): 216–19. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.216.

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Palladium chloride anchored on polystyrene modified by 5-amino-1,10-phenanthroline was prepared and used as catalysts for the Suzuki cross-coupling reactions of aryl halide with arylboronic acid in supercritical carbon dioxide without use of organic solvent. The heterogeneous catalyst revealed excellent and recoverable catalytic performance for a wide range of aryl halides substrates. It can be easily separated from the reaction mixture and reused for six recycles without significant loss of catalytic activity.

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Larsson, Ragnar, and Abdul Malek. "The Transformation by Catalysis of Prebiotic Chemical Systems to Useful Biochemicals: A Perspective Based on IR Spectroscopy of the Primary Chemicals: I. The Synthesis of Peptides by the Condensation of Amino Acids." Applied Sciences 10, no. 3 (2020): 928. http://dx.doi.org/10.3390/app10030928.

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It is now widely speculated that life originated at the “Black Smokers” of the undersea hydrothermal vents, where conditions exist for the formation of the primary ingredients and their subsequent transformation to higher biotic species such as amino acids, alcohols, etc. Any possible routes for the prebiotic oligomerization of simple compounds like amino acids, necessary for cell formation, has so far not been well understood. However, Leman et al. recently reported that under standard laboratory conditions carbonyl sulfide (COS) can “mediate” the oligomerization of simple amino acids in mode

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Huo, Xiaohong, Jingke Fu, Xiaobo He, Jianzhong Chen, Fang Xie та Wanbin Zhang. "Pd/Cu dual catalysis: highly enantioselective access to α-substituted α-amino acids and α-amino amides". Chemical Communications 54, № 6 (2018): 599–602. http://dx.doi.org/10.1039/c7cc08732b.

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In this work, we have developed a synergistic Pd/Cu catalyst system for the asymmetric allylation of glycine iminoesters/amides, affording a range of α-substituted α-amino acids/amides in high yields and with excellent enantioselectivities (88 → 99% ee).

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