Dimethyl-α-styrylsulphonium bromide as a reaction intermediate
作者:Yuan L. Chow、Bert H. Bakker、Kiyoshi Iwai
DOI:10.1039/c39800000521
日期:——
The addition product of styrene, bromine, and dimethyl sulphide was treated with bases to give the dimethyl-α-styrylsulphonium ion which reacted rapidly with various nucleophiles and also underwent slower base-catalysed rearrangement.
Activated 1-alkenes such as ketene dithioacetals, vinyl sulfides, N-vinyl amides, and N-vinylcarbazole react with oxalyl chloride or ethoxalyl chloride in the presence of pyridine to give the 2-oxo-3-alkenoic acids or ethyl esters, respectively.
The Lithium Diisopropylamide-induced Fragmentation of 1,3-Dithiolane Derivatives of Several Ketones Having α-Hydrogen
作者:Hideyuki Ikehira、Shigeo Tanimoto、Tatsuo Oida
DOI:10.1246/bcsj.56.2537
日期:1983.8
The reaction of 1,3-dithiolane derivatives of ketones having α-hydrogen with lithium diisopropylamide results in fragmentation to the corresponding thioketone followed by further conversion in a few steps to the other intermediate species which, on trapping with alkyl halide, leads to a vinylic sulfide and/or a sulfide bearing a secondary alkyl group.
Zeolite Y nanosheets with micro-meso-macroporous structure was synthesized, and applied to assemble Pd catalyst (Pd/NS-Y) for direct vinylation of thiophenes in high activity and selectivity, as compared to Pd(OAc)2, Pd(NO3)2,...