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12.729 Aktuelle Fachpublikationen zum Thema temperature

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Stereoselective Synthesis of e-Lactones or Spiro-Heterocycles through NHC-Catalyzed Annulation: Divergent Reactivity by Catalyst Control

22.10.2014 | Min Wang; Zi-Qiang Rong; Yu Zhao, Chemical Communication, 2014

NHC-catalyzed divergent annulations of enals with heterocyclic enones were developed to produce benzofuran/indole-containing e-lactones or spiro-heterocycles in a highly diastereo- and enantioselective fashion. The chemo-selectivity controlled by the chiral backbone of the catalyst is ...

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Novel D-glucosamine-derived pyridyl-triazole@palladium catalyst for solvent-free Mizoroki-Heck reactions and its application in the synthesis of Axitinib

21.10.2014 | Chao Shen; Hongyun Shen; Ming Yang; Chengcai Xia; pengfei zhang, Green Chemistry, 2014

A green method for the synthesis of D-glucosamine-derived triazole@palladium catalyst has been described. The synthesized catalyst containing a 2-pyridyl-1,2,3-triazole ligand was prepared via a click route in high yield and was explored in Heck cross-coupling reactions between different aryl ...

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Single catalyst electrocatalytic reduction of CO2 in water to H2+CO syngas mixtures with water oxidation to O2

21.10.2014 | Peng Kang; Zuofeng Chen; Animesh Nayak; Sheng Zhang; Thomas J. Meyer, Energy & Environmental Science, 2014

A single Ru(ii) polypyridyl carbene complex catalyzes the electrochemical reduction of CO2 in water with added bicarbonate to give syngas H2+CO mixtures at the cathode and water oxidation to O2 at the anode. The H2/CO ratio in the syngas product can be adjusted between 4 [ ] : [ ] 1 and 1 [ ] : [ ...

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Aryl-Palladium-NHC complex: Efficient Phosphine-free Catalyst Precursors for the Carbonylation of Aryl Iodides with Amines or Alkynes

21.10.2014 | Chunyan Zhang; Jianhua Liu; Chungu Xia, Organic & Biomolecular Chemistry, 2014

A series of aryl-palladium-NHC compounds were prepared according to the reported methods and their catalytic activity in the carbonylation of aryl iodides to synthesize α-keto amides and alkynones were examined. And these practical aryl-palladium-NHC complexes shown highly efficient catalyzed ...

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The double perovskite oxide Sr2CrMoO6-[small delta] as an efficient electrocatalyst for rechargeable lithium air batteries

21.10.2014 | Zhong Ma; Xianxia Yuan; Lin Li; Zi-Feng Ma, Chemical Communication, 2014

A double perovskite oxide Sr2CrMoO6−δ (SCM), synthesized using the sol–gel and annealing method with the assistance of citric acid and ethylene diamine tetraacetic acid, was investigated for the first time as an efficient catalyst for rechargeable lithium air batteries. The SCM cathode enables ...

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The Direct Electrophilic Cyanation of [small beta]-Keto Esters and Amides with Cyano Benziodoxole

21.10.2014 | Yao-Feng Wang; Jiashen Qiu; Dejie Kong; Yongtao Gao; Feipeng Lu; Pran Gopal Karmaker; fuxue chen, Organic & Biomolecular Chemistry, 2014

The direct electrophilic α-cyanation of β-keto esters and amides has been developed using hypervalent iodine benziodoxole-derived cyano reagent. It accomplishes within 10 min without any catalyst in DMF at room temperature. Thus, the highly functionallized quaternary carbon-centered nitriles were ...

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Improving catalyst activity in secondary amine catalysed transformations

21.10.2014 | John B Brazier; Julian Rowley; Timothy J K Gibbs; Sze Chak Yau; A R Kennedy; James A Platts; Leo Samulis; Nicholas C ..., Organic & Biomolecular Chemistry, 2014

The effect on catalyst performance of altering substituents at the 2-position of the Macmillan imidazolidinone has been examined. Condensation of L-phenylalanine N-methyl amide with acetophenone derivatives results in a series of imidazolidinones whose salts can be used to accelerate the ...

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Tungsten‐Catalyzed Regio‐ and Enantioselective Aminolysis of trans‐2,3‐Epoxy Alcohols: An Entry to Virtually Enantiopure Amino Alcohols

20.10.2014 | Chuan Wang, Hisashi Yamamoto, Angewandte Chemie International Edition, 2014

Abstract The first catalytic enantioselective aminolysis of trans‐2,3‐epoxy alcohols has been accomplished. This stereospecific ring‐opening process was efficiently promoted by a tungsten/bis(hydroxamic acid) catalytic system, furnishing various anti‐3‐amino‐1,2‐diols with excellent ...

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Tungsten‐Catalyzed Regio‐ and Enantioselective Aminolysis of trans‐2,3‐Epoxy Alcohols: An Entry to Virtually Enantiopure Amino Alcohols

20.10.2014 | Chuan Wang, Hisashi Yamamoto, Angewandte Chemie, 2014

Abstract The first catalytic enantioselective aminolysis of trans‐2,3‐epoxy alcohols has been accomplished. This stereospecific ring‐opening process was efficiently promoted by a tungsten/bis(hydroxamic acid) catalytic system, furnishing various anti‐3‐amino‐1,2‐diols with excellent ...

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Transition metal oxide catalysts as an alternative for the oxidation of nitrogen monoxide to nitrogen dioxide: kinetic modelling at high space velocity

18.10.2014 | Leonardo Tecchio, Pablo Marín, Fernando V. Díez, Salvador Ordóñez, Journal of Chemical Technology & Biotechnology, 2014

Abstract Background The oxidation of NO to NO2 is a key step in environmental pollution abatement techniques, such as the “fast‐SCR” or the diesel engines catalytic traps. In both cases, the conversion of an important fraction of NO into NO2 is a key step. In this work, two commercially ...

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