Process for preparing carbonate esters

Details Process for preparing carbonate esters Process for preparing carbonate esters

1995-05-18

1996-08-06

Richter, Johann

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

Organic compounds

Carbonate esters

558274, C07C 6806

Patent

active

055435467

ABSTRACT:
Carboxylate (1) of the formula R.sup.1 COOR.sup.2 (where each of R.sup.1 and R.sup.2 independently represents an alkyl group, an alicyclic hydrocarbon group or an aryl alkyl group), an aromatic hydroxy compound of the formula R.sup.3 OH (where R.sup.3 represents an aromatic group with or without a substituent), and a catalyst are supplied to a batch reactor 1, and a transesterification between the carboxylate (1) and the aromatic hydroxy compound is performed to produce carboxylate (3) of the formula R.sup.1 COOR.sup.3 (where R.sup.1 and R.sup.3 are as defined above). After distilling off the by-produced alcohol and unreacted compounds using a distillation column 2, carbonate ester (4) of the formula R.sup.4 O--COOR.sup.5 (where each of R.sup.4 and R.sup.5 independently represents an alkyl group, an alicyclic hydrocarbon group or an aryl alkyl group) is supplied to the batch reactor 1. Then, a transesterification between the carboxylate (3) and the carbonate ester (4) is performed to produce carbonate ester (5) of the formula R.sup.3 O--COOR.sup.6 (where R.sup.3 is as defined above, and R.sup.6 is a substituent selected from the group consisting of R.sup.3, R.sup.4 and R.sup.5). This process enables efficient preparation of carbonate esters.

REFERENCES:
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patent: 3328439 (1967-06-01), Hamilton
patent: 4045464 (1977-08-01), Romano et al.
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patent: 5210268 (1993-05-01), Fukuoka et al.
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Jean Barry et al., Tetrahedron Letters, vol. 29, No. 36, pp. 4567-4568, 1988, "Organic Syntheses Without Solvent: Base-Catalysed Ester Interchange".

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