Process for the production of 1,3-cyclopentanedione

Details Process for the production of 1,3-cyclopentanedione Process for the production of 1,3-cyclopentanedione

1990-01-03

1992-02-11

Killos, Paul J.

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

Organic compounds

Oxygen containing

560181, 560121, C07C 4500

Patent

active

050877607

ABSTRACT:
A process for the production of 1,3-cyclopentanedione, which is a versatile intermediate product for numerous active ingredient syntheses. For this purpose, a malonic acid ester is reacted with a haloalkoxybutenoic acid ester, the resultant bis-(alkoxycarbonyl) alkoxypentenoic acid ester is cyclized to alkoxycarbonyl alkoxycyclopentenone, the ester function is saponified, and finally the intermediate is decarboxylated to the end product.

REFERENCES:
patent: 3518296 (1970-06-01), Bucourt
patent: 3531504 (1970-09-01), Coria
patent: 3931322 (1976-01-01), Hengartner
patent: 4132726 (1979-01-01), Kurozumi et al.
patent: 4168280 (1979-09-01), Nash
patent: 4892966 (1990-01-01), Wild
Chemical Abstracts, Vol. 107, par. 197620j (1987).
Aldrichimica Acta, Vol. 10, Nov. 1, 1977, p. 19.
Carlo Lick and Kurt Schank, 1,3-Cyclopentanedione-a Prized Reagent, Chemische Berichte, Vol. III, (1978, pp. 2461-1464).

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