Novel synthesis of flavour quality [gamma]-lactones

The cyclization of 3-alkenoic acids with 80% sulphuric acid in the synthesis of [gamma]-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 [gamma]-lactones formed. Two catalysts, p-tolue...

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Bibliographic Details
Published in:Flavour and fragrance journal 2006-01, Vol.21 (3), p.395-399
Main Authors: Zope, Dhananjay D, Patnekar, Shridhar G, Kanetkar, Vinod R
Format: Article
Language:English
Online Access:Get full text
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Summary:The cyclization of 3-alkenoic acids with 80% sulphuric acid in the synthesis of [gamma]-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 [gamma]-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 [gamma]-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 [gamma]-lactones was also made.
ISSN:0882-5734
DOI:10.1002/ffj.1591