Tropylium salts as efficient organic Lewis acid catalysts for acetalization and transacetalization reactions in batch and flow
作者:D. J. M. Lyons、R. D. Crocker、D. Enders、T. V. Nguyen
DOI:10.1039/c7gc01519d
日期:——
carbonyl compounds. Herein we demonstrate for the first time that tropylium salts can act as organic Lewis acid catalysts to facilitate acetalization and transacetalization reactions of a wide range of aldehyde substrates. This metal-free method works efficiently in both batch and flow conditions, prompting further future applications of tropylium organocatalysts in green synthesis.
Cobalt(II)-catalyzed chemoselective synthesis of acetals from aldehydes
作者:Subbarayan Velusamy、T Punniyamurthy
DOI:10.1016/j.tetlet.2004.04.126
日期:2004.6
The acetalization of aldehydes has been studied with methanol, ethanol, and 2-propanol using CoCl2 in high yields under reflux conditions. The reaction is simple, efficient, chemoselective and does not involve any other additive.
A novel PVP-I catalyzed acetalizations/transacetalizations of carbonyl compounds has been developed processing with a mild and easy handling fashion. Different types of Acyclic and cyclic acetals were prepared from carbonyl compounds or their acetals successfully. Further applications of newly developed catalytic combination were testified. This protocol featured with simplicity of operation, mild
Tetrabutylammonium Tribromide (TBATB) as An Efficient Generator of HBr for an Efficient Chemoselective Reagent for Acetalization of Carbonyl Compounds
作者:Rangam Gopinath、Sk. Jiaul Haque、Bhisma K. Patel
DOI:10.1021/jo025701o
日期:2002.8.1
Acyclic and cyclic acetals of various carbonyl compounds were obtained in excellent yields under a mild reaction condition in the presence of trialkyl orthoformate and a catalytic amount of tetrabutylammonium tribromide (TBATB) in absolute alcohol. Chemoselective acetalization of an aldehyde in the presence of ketone, unsymmetrical acetal formation, shorter reaction times, mild reaction conditions