Perchloric Acid Adsorbed on Silica Gel (HClO<sub>4</sub>-SiO<sub>2</sub>) as an Extremely Efficient and Reusable Catalyst for 1,3-Dithiolane/Dithiane Formation
作者:Asit Chakraborti、Santosh Rudrawar、Ram Besra
DOI:10.1055/s-2006-942474
日期:2006.8
Perchloric acid adsorbed on silicagel (HClO 4 -SiO 2 ) has been found to be an extremely efficient and reusable catalyst for 1,3-dithiolane and 1,3-dithiane formation under solvent-free conditions at room temperature.
Phosphorus pentoxide supported on silica gel (P2O5/SiO2) efficiently acts as a highly active and reusable catalyst for cyclic and non-cyclic S,S-acetalization of a variety of carbonyl compounds under mild, solvent-free and ambient conditions. This method offers significant advantages such as high conversion, clean work-up, short reaction times and simplicity in operation.[GRAPHICS].