Process for the preparation of unsaturated cyclic

专利名称：Process for the preparation of unsaturated

cyclic ketones

发明人：WILD, HANS-JAKOB, DR.申请号：EP107011.2申请日：190419公开号：EP03394A3公开日：19901128

摘要：The present invention relates to a kind of methods, are used for gamma-pyrone, i.e. the preparation of its compound of formula....Wherein R<1>indicates methylor ethyl....formula I are known odorous substance and flavourings....process feature is akind of compound of formula....Wherein R<1>has above-mentioned meaning, the benzoylthat R<2>indicates alkanoyl or selectively replaces, and R<3>indicates free radical....Wherein R<4>and R<5>indicates lower alkyl, particularly methyl or hydroxyl, is limitedby the pyranone cyclization in an acid medium, is, the reaction product of formula....Wherein R<1>and R<2>has above-mentioned meaning,..It is the application hydrolysisunder alkaline condition.

申请人：L. GIVAUDAN & CIE SOCIETE ANONYME

地址：CH-1214 Vernier-Genève CH

国籍：CH

代理机构：Urech, Peter, Dr.

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