Perchloric Acid Adsorbed on Silica Gel (HClO<sub>4</sub>-SiO<sub>2</sub>) as an Inexpensive, Extremely Efficient, and Reusable Dual Catalyst System for Acetal/Ketal Formation and Their Deprotection to Aldehydes/Ketones
作者:Asit Chakraborti、Raj Kumar、Dinesh Kumar
DOI:10.1055/s-2006-958948
日期:2007.1
Perchloric acid adsorbed on silica gel (HClO 4 -SiO 2 ) is reported as extremely efficient, inexpensive, and reusable catalyst for dual role for protection of aldehydes/ketones (with trialkyl orthoformates) as acetals/ketals and deprotection (with water-alcohol) to regenerate the carbonyl compounds in high yields at room temperature and in short times. Acetalization/ketalization of electrophilic aldehydes/ketones
据报道,吸附在硅胶上的高氯酸 (HClO 4 -SiO 2 ) 是一种极其有效、廉价和可重复使用的催化剂,可用于保护醛/酮(与原甲酸三烷基酯)作为缩醛/缩酮和脱保护(使用水-醇)的双重作用在室温和短时间内以高产率再生羰基化合物。亲电子醛/酮的缩醛化/缩酮化在无溶剂条件下进行。弱亲电子醛/酮和具有可与催化剂配位的取代基的醛需要相应的醇作为溶剂。