Silica Gel-Supported Polyphosphoric Acid (PPA/SiO<sub>2</sub>) as an Efficient and Reusable Catalyst for Conversion of Carbonyl Compounds into Oxathioacetals and Dithioacetals
作者:Tadashi Aoyama、Toshio Takido、Mitsuo Kodomari
DOI:10.1055/s-2004-832812
日期:——
A simple and efficient method for the conversion of carbonyl compounds to oxathioacetals and dithioacetals by using polyphosphoric acid supported on silica gel (PPA/SiO2) as an acid catalyst have been developed. PPA/SiO2 is easily recovered from the reaction mixture and reused without a decrease in catalytic activity.
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.