| 摘要 |
<p>A process for preparation of bicyclic 1,3-diketone salts of formula I wherein R1, R2, R3 and R4 are each independently of the others denotes hydrogen atom or C1-C4 alkyl; every A and E are independently of the other C1-C2alkylene, which can be substituted once or up to four times with C1-C4 alkyl group; and M+ is alkali metal ion, alkali earth metal ion or ammonium ion, by oxidation of compound of formula II (II) to compound of formula III (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.</p> |
