Bronsted acidic ionic liquids: a green, efficient and reusable catalyst system and reaction medium for fischer esterification

TitleBronsted acidic ionic liquids: a green, efficient and reusable catalyst system and reaction medium for fischer esterification
Publication TypeJournal Article
Year of Publication2005
AuthorsJoseph, T, Sahoo, S, Halligudi, SB
JournalJournal of Molecular Catalysis A - Chemical
Volume234
Issue1-2
Pagination107-110
Date PublishedJUN
Type of ArticleArticle
ISSN1381-1169
Keywordsacids, alcohol and reaction medium, Fischer esterification, Ionic liquid
Abstract

Bronsted acidic ionic liquid containing nitrogen-based organic cations 1-methylimidazole and 1-butyl-3-methylimidazolium and inorganic anions of the type BF4-, PF6- and PTSA(-) has been synthesized in good yields and used as a catalysts and reaction medium for Fischer esterification of alcohols with acids. These were characterized using FTIR and NMR spectroscopy. Ionic liquids as catalyst afforded good alcohol conversion and excellent ester selectivity. Fischer esterification of acetic acid with benzyl alcohol with different Bronsted acidic ionic liquids was carried out. Maximum substrate conversion 100 % and product selectivity 100 % was observed on using [BMIM](+)PTSAas catalyst over a period of 2 h. The ester was easily separated from the reaction mixture and the ionic liquid was reused four times after removing water. No significant loss in catalytic activity was observed on recycling. (c) 2005 Elsevier B.V. All rights reserved.

DOI10.1016/j.molcata.2005.03.005
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)3.958
Divison category: 
Catalysis and Inorganic Chemistry