Process for the preparation of bicyclic diketone salts

Details Process for the preparation of bicyclic diketone salts Process for the preparation of bicyclic diketone salts

2005-06-28

2005-06-28

Solola, Taofiq (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C568S315000

Reexamination Certificate

active

06911547

ABSTRACT:
The present invention relates to a process for the preparation of bicyclic 1,3-diketone salts of formula Iwherein R1, R2, R3and R4are each independently of the others hydrogen or C1-C4alkyl; A and E are each independently of the other C1-C2alkylene, which may be substituted once or up to four times by a C1-C4alkyl group, and M+is an alkali metal ion, alkaline earth metal ion or ammonium ion, by oxidation of a compound of formula IIto a compound of formula IIIand 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.

REFERENCES:
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Qudrat-I-Khuda M., “XXIX. Studies in Keto-Iactol Tautomerism. Part IV, Chemistry of 5-acetyl-1:1:2-trimethylcyclopentane-2-carboxylic Acid. Observations on the Constitutions of the Acid Esters of Camphoric Acid and a Synthesis of Homoepicamphor”, Journal of the Chemical Society, 1920, pp. 206-213.

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