Process for the preparation of carbonic acid esters

Details Process for the preparation of carbonic acid esters Process for the preparation of carbonic acid esters

1980-01-17

1982-05-25

Sutto, Anton H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

549501, 549473, C07C 6800

Patent

active

043316107

ABSTRACT:
The present invention relates to a process for the preparation of carbonic acid esters of mono- or polyalcohols, which is characterized in that urethanes are reacted with monoalcohols or with polyalcohols in a molar ratio of alcohol to urethane group of at least 1 to 1, in the presence of a catalyst, at reaction temperatures of between 120.degree. C. and 270.degree. C.
The present invention thus also relates to a process for the preparation of oligocarbonates and of polycarbonates, which is characterized in that monourethanes or bisurethanes are reacted with primary dialcohols in a molar ratio of about 1.5:1 to about 1:1.5, together with monoalcohols, in the presence of catalysts, at reaction temperatures of between 120.degree. C. and 270.degree. C.

REFERENCES:
patent: 2834799 (1958-05-01), Sowa
N. Gaylord, J. Organic Chem., 25, 1874, (1960), The Reactions of Disubstituted Carbamates with Alcohols.
P. A. S. Smith, Open-Chain Nitrogen Compounds, vol. 1, pp. 261, 287; (1965), Benjamin Inc. N.Y.

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