| 摘要 |
The present invention relates to a process for the preparation of bicyclic 1,3-diketone salts of formula I wherein R<SUB>1</SUB>, R<SUB>2</SUB>, R<SUB>3 </SUB>and R<SUB>4 </SUB>are each independently of the others hydrogen or C<SUB>1</SUB>-C<SUB>4</SUB>alkyl; A and E are each independently of the other C<SUB>1</SUB>-C<SUB>2</SUB>alkylene, which may be substituted once or up to four times by a C<SUB>1</SUB>-C<SUB>4</SUB>alkyl group, and M<SUP>+</SUP>is an alkali metal ion, alkaline earth metal ion or ammonium ion, by oxidation of a compound of formula II to a compound of formula III and subsequent conversion to a compound of formula I either in the presence of a base and a catalytic amount of a cyanide or in the presence of an alkali metal alcoholate or alkaline earth metal alcoholate, and to novel bicyclic enol lactone intermediates of formula III for use in that process.
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