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Novel synthesis of flavour quality γ ‐lactones
Author(s) -
Zope Dhananjay D.,
Patnekar Shridhar G.,
Kanetkar Vinod R.
Publication year - 2006
Publication title -
flavour and fragrance journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 70
eISSN - 1099-1026
pISSN - 0882-5734
DOI - 10.1002/ffj.1591
Subject(s) - chemistry , catalysis , perchloric acid , sulfur dioxide , organic chemistry , phosphoric acid , toluene , lactone , acid catalysis , sulfur
The cyclization of 3‐alkenoic acids with 80% sulphuric acid in the synthesis of γ ‐lactones is always associated with fumes of sulphur dioxide gas and traces of cyclopentenones. The cyclopentenones formed during the reaction give off‐odours to the γ ‐lactones formed. Two catalysts, p ‐toluene sulphonic acid and o ‐phosphoric acid, with a catalytic amount of perchloric acid, were tried in the lactonization reaction to obtain γ ‐lactones in high yields, and the reaction was free from sulphur dioxide gas fumes and cyclopentenones. A comparison of these catalysts with 80% sulphuric acid in the synthesis of γ ‐lactones was also made. Copyright © 2006 John Wiley & Sons, Ltd.