4433-56-1Relevant articles and documents
AEROBIC ELECTROCATALYTIC OXIDATION OF HYDROCARBONS
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Paragraph 0074, (2022/01/04)
This invention is directed to a method of oxygenating hydrocarbons with molecular oxygen, O2, as oxidant under electrochemical reducing conditions, using polyoxometalate compounds containing copper such as Q10 [Gu4(H2O)2(B-α-PW9O)2] or Q12{ [Cu(H2O)]3[(A-α- PW9O34)2(NO3)-] } or solvates thereof as catalysts, wherein Q are each independently selected from alkali metal cations, alkaline earth metal cations, transition metal cations, NH4+,H+ or any combination thereof.
Cysteine Chemistry in Connection with Abiogenesis
Bridoux, Maxime,Ceccarelli, Cecilia,Shalayel, Ibrahim,Vallée, Yannick,Vazart, Fanny,Youssef-Saliba, Sparta
supporting information, (2020/05/18)
Theoretical and experimental work has been conducted about possible prebiotic syntheses of cysteine. Activated derivatives of this amino acid can oligomerize and polymerize to afford various poly-thiazolines and cysteine-rich chains.
Electro-catalytic conversion of ethanol in solid electrolyte cells for distributed hydrogen generation
Ju, HyungKuk,Giddey, Sarbjit,Badwal, Sukhvinder P.S.,Mulder, Roger J.
, p. 744 - 757 (2016/07/22)
The global interest in hydrogen/fuel cell systems for distributed power generation and transport applications is rapidly increasing. Many automotive companies are now bringing their pre-commercial fuel cell vehicles in the market, which will need extensive hydrogen generation, distribution and storage infrastructure for fueling of these vehicles. Electrolytic water splitting coupled to renewable sources offers clean on-site hydrogen generation option. However, the process is energy intensive requiring electric energy >4.2?kWh for the electrolysis stack and?>6?kWh for the complete system per m3 of hydrogen produced. This paper investigates using ethanol as a renewable fuel to assist with water electrolysis process to substantially reduce the energy input. A zero-gap cell consisting of polymer electrolyte membrane electrolytic cells with Pt/C and PtSn/C as anode catalysts were employed. Current densities up to 200?mA?cm?2 at 70?°C were achieved at less than 0.75?V corresponding to an energy consumption of about 1.62?kWh?m?3 compared with >4.2?kWh?m?3 required for conventional water electrolysis. Thus, this approach for hydrogen generation has the potential to substantially reduce the electric energy input to less than 40% with the remaining energy provided by ethanol. However, due to performance degradation over time, the energy consumption increased and partial oxidation of ethanol led to lower conversion efficiency. A plausible ethanol electro-oxidation mechanism has been proposed based on the Faradaic conversion of ethanol and mass balance of the by-products identified and quantified using 1H nuclear magnetic resonance spectroscopy and gas chromatography.
Photoinduced Homolysis of Alkyl-Cobalt(III) Bonds in a Cyclodextrin Cage
Imabeppu, Kohei,Kuwano, Hiroyuki,Yutani, Eriko,Kitagishi, Hiroaki,Kano, Koji
, p. 1784 - 1789 (2016/05/02)
Photodecomposition of methyl- and ethyl-CoIII complexes of meso-tetrakis(4-sulfonatophenyl)porphyrin (CH3- and C2H5-CoIIITPPSs) was used as a reaction probe to study the cage effect of cyclodextrin capsules formed by two per-O-methylated β-cyclodextrin (TMe-β-CD) molecules and their covalently linked dimer, Ph2CD. The photodecomposition of CH3-CoIIITPPS under aerobic conditions was markedly suppressed in the presence of TMe-β-CD and Ph2CD, while C2H5-CoIIITPPS was less affected. Alkyl-CoIIITPPS formed two types of inclusion complex with Ph2CD, the alkyl groups in Type 1 being located at the opposite side of the phenyl linker of Ph2CD and those in Type 2 being located at the same side. The photodecomposition of C2H5-CoIIITPPS in Type 1 proceeded via an ethylperoxo complex, while that in Type 2 occurred via a radical pair generated in a narrow, rigid cage to form ethylene and CoIITPPS.
Room-temperature acetylene hydration by a Hg(II)-laced metal-organic framework
Yee, Ka-Kit,Wong, Yan-Lung,Zha, Meiqin,Adhikari, Ramesh Y.,Tuominen, Mark T.,He, Jun,Xu, Zhengtao
, p. 10941 - 10944 (2015/06/30)
Thiol (-SH) groups within a Zr(iv)-based metal-organic framework (MOF) anchor Hg(ii) atoms; oxidation by H2O2 then leads to acidic sulfonate functions for catalyzing acetylene hydration at room temperature.
Synthesis of aldehydic ribonucleotide and amino acid precursors by photoredox chemistry
Ritson, Dougal J.,Sutherland, John D.
supporting information, p. 5845 - 5847 (2013/07/11)
Light work: UV irradiation of a system formed by adding copper(I) cyanide to an aqueous solution of glycolonitrile, sodium phosphate, and hydrogen sulfide efficiently generates aldehyde precursors to the building blocks of RNA and proteins. Copyright
Catalytic reactions in direct ethanol fuel cells
Kim, In,Han, Oc Hee,Chae, Seen Ae,Paik, Younkee,Kwon, Sung-Hyea,Lee, Kug-Seung,Sung, Yung-Eun,Kim, Hasuck
supporting information; experimental part, p. 2270 - 2274 (2011/04/21)
(Figure Presented) Different anode catalysts (Pt/C, PtRu/C, Pt 3Sn/C) and operating potentials lead to different product distributions in the anode exhaust of direct ethanol fuel cells, as shown by liquid-state 13C NMR spectroscopy (see typical spectrum). Addition of Ru or Sn to Pt/C increases current density, mainly because of enhanced acetic acid production, and the potential dependences of products give clues to reaction pathways of ethanol electro-oxidation.
Dismutation of aldehydes catalyzed by alcohol dehydrogenases
Velonia, Kelly,Smonou, Ioulia
, p. 2283 - 2287 (2007/10/03)
The dismutation of aldehydes with the following three alcohol dehydrogenases, the mesophilic Saccharomyces cerevisiae ADH; the thermophilic Thermoanaerobium brockii ADH; and the recently isolated psychrophilic Moraxella sp. TAE123 ADH, was studied with high-resolution 1H NMR spectroscopy. All three ADHs catalyzed the rapid dismutation of aldehydes to the corresponding alcohols and carboxylic acids.
Coenzyme A hemithioacetals as easily prepared inhibitors of CoA ester-utilizing enzymes
Schwartz, Benjamin,Vogel, Kurt W.,Drueckhammer, Dale G.
, p. 9356 - 9361 (2007/10/03)
Hemithioacetals are formed by reactions of coenzyme A (CoA) with aldehydes in aqueous solution. Equilibria for hemithioacetal formation with four commercially available aldehydes and rate constants for hemithioacetal dissociation have been studied. The hemithioacetals are viewed as acyl-CoA analogs having a tetrahedral center in place of the planar trigonal thioester carbonyl carbon. These compounds may serve as mimics of the tetrahedral intermediate or transition state in the reactions of acyl-CoA dependent acyltransferase enzymes. The hemithioacetal generated by reaction of CoA with formaldehyde is a poor inhibitor of chloramphenicol acetyltransferase, with a K(i) more than 6-fold higher than the K(m) for the substrate acetyl-CoA. The hemithioacetals formed by reaction of CoA with acetaldehyde and trifluroacetaldehyde are substantially better inhibitors, with K(i) values approximately 2.4-fold and 10-fold lower than the K(m) values for acetyl-CoA, respectively. The hemithioacetal formed by reaction of CoA with succinic semialdehyde inhibits succinic thiokinase, with a K(i) 4-fold lower than the K(m) for the substrate succinyl-CoA. The CoA hemithioacetals provide a novel readily accessible new class of acyl-CoA analogs for use in mechanistic and structural studies of CoA ester-utilizing enzymes.
