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Green and moisture-stable Lewis acidic ionic liquids (choline chloride · xZnCl2) catalyzed protection of carbonyls at room temperature under solvent-free conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
52630 46879 2006 6 PDF Available
Title
Green and moisture-stable Lewis acidic ionic liquids (choline chloride · xZnCl2) catalyzed protection of carbonyls at room temperature under solvent-free conditions
Abstract

Choline chloride · xZnCl2 (x = 1–3) or benzyltrimethylammonium chloride · 2ZnCl2 have been used as efficient and recyclable catalysts for protection of carbonyls to 1,3-dioxolanes and 1,3-dioxanes at room temperature under solvent-free conditions. FT-IR investigation demonstrates the four ionic liquids have similar Lewis acid strength, which is in agreement with the activities observed in the acetalization reaction. The catalytic system choline chloride · 2ZnCl2 can be reused up to five times without appreciable loss of activity. The simple procedures as well as easy recovery and reuse of this novel catalytic system are expected to contribute to the development of more benign acetalization procedure of carbonyl compounds.

Keywords
Choline chloride · xZnCl2; Acetalization; Solvent-free; Reusability; Lewis acidity; Green chemistry
First Page Preview
Green and moisture-stable Lewis acidic ionic liquids (choline chloride · xZnCl2) catalyzed protection of carbonyls at room temperature under solvent-free conditions
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 7, Issue 9, September 2006, Pages 651–656
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis