Takashi Ohshima,Yoshihiro Yamamoto,Usaji Takaki,Yoshihisa Inoue,Takuya Saeki,Kenji Itou,Yusuke Maegawa,Takanori Iwasaki,Kazushi Mashima.Theoretical study of Al( III )-catalyzed conversion of glyoxal to glycolic acid : dual activated 1,2-hydride shift mechanism by protonated Al(OH) 3 species.Chemical...
Mechanism for aldose-ketose interconversion by D-xylose isomerase involving ring opening followed by a 1,2-hydride shift. The active site and mechanism of d-xylose isomerase have been probed by determination of the crystal structures of the enzyme bound to various substrates, ... CA Collyer,K ...
有机反应机理 2 7.1活性中间体概述 多步反应，生成一个或多个活性中间体 活性中间体的研究是机理研究的一个重要组成部分 确定中间体的存在和结构可以提供有关反应机理的信息，特别是关于过渡态的结构信息 有机反应机理 3 根据Hammond假设，确定活性中间体的结构有助于了解过渡态的结构 因此，活性中间体的研究对有...
Mechanism driven catalyst design with atomically uniform ensemble sites is an important yet challenging issue in heterogeneous catalysis associated with breaking the activity-selectivity trade-off. Herein, a trimer Ni1Sb2site in NiSb intermetallic featuring superior selectivity is elaborated for acetylene se...
G. G. KAHLEJohn Wiley & Sons, LtdChemischer InformationsdienstEberle, M.K., Kahle, G.G., 1977. A 1,3-hydride shift in the rearrangement of (1- phenylallyl)oxyacetic acid to 2-ethyl-2-phenyl-1,3-dioxolan-4-one. J. Am. Chem. Soc. 99, 6038-6042....
When this tandem reaction was conducted in wet CH2Cl2, the [1,2]-hydride shift step in dry solution turned to a very efficient water-catalyzed [1,2]-hydrogen shift mechanism with an activation free energy of 16.4 kcal/mol. Because of this, the tandem reaction of enynyl acetates was ...
ChemInform Abstract: Asymmetric 1,7‐Hydride Shift: The Highly Asymmetric Reduction of . alpha.,β‐Unsaturated Ketones to Secondary Alcohols via a Novel Tandem Michael Addition‐Meerwein‐Ponndorf‐Verley Reduction.doi:10.1002/chin.199716044stereochemistry (general, optical resolution...
Amino acid esters act as chelates to CoIII; for example, the β-alanine isopropyl ester is known as both a chelate and as an N-bonded monodentate,983 and the mechanism of hydrolysis of the ester, which is activated by coordination, to yield chelated β-alanine has been closely examined. ...
BF3·OEt2-Mediated 1,3-Hydride Shift Followed by 6π Electrocyclization: An Efficient Route for the Synthesis of Pyridopyrimidine, Pyranoquinoline, and Phenanthroline Derivativesfused pyridine derivativesring closure reactionsfused pyrimidine derivatives...
Migratory insertion of II would produce intermediate III, which possesses the exact geometry that is ready to undergo a 1,4-palladium/hydride shift, thus achieving a selective C–H bond activation of the aldehyde moiety48. We anticipate such a reaction mode may not be limited to C–H bond ...