Process for preparing diesters of higher .alpha.,.omega.-dicarbo

Details Process for preparing diesters of higher .alpha.,.omega.-dicarbo Process for preparing diesters of higher .alpha.,.omega.-dicarbo

1997-06-09

1998-07-28

Barts, Samuel

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

Organic compounds

Carboxylic acid esters

560204, C07C 6934, C07C 6700

Patent

active

057865027

ABSTRACT:
A process is provided for preparing diesters of higher .alpha.,.omega.-dicarboxylic acids from cycloaliphatic ketones and carbonic diesters in the presence of a strongly basic agent, which involves continuously feeding a cycloaliphatic ketone having 8 to 20 ring members, at least an equimolar amount of a carbonic diester and a catalytic amount of a strongly basic agent to a reaction zone in which condensation occurs between the cycloaliphatic ketone and the carbonic diester to give the corresponding cyclic .beta.-keto acid ester enolate, which is then ring-opened by the released alcohol to give the .alpha.,.omega.-dicarboxylic diester and from which reaction mixture is continuously taken off.

REFERENCES:
patent: 2811551 (1957-10-01), Coffman et al.
patent: 3290367 (1966-12-01), White et al.
patent: 3574756 (1971-04-01), Sheehan et al.
patent: 4689344 (1987-08-01), Bar-Tana
patent: 5436365 (1995-07-01), Kohler
patent: 5453535 (1995-09-01), Fischer

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