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 silicagel (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
Ruthenium(III) chloride-catalyzed chemoselective synthesis of acetals from aldehydes
作者:Surya K. De、Richard A. Gibbs
DOI:10.1016/j.tetlet.2004.09.060
日期:2004.10
A mild and chemoselective acetalization procedure for the protection of various aldehydes in the presence of ketones is described. (C) 2004 Elsevier Ltd. All rights reserved.