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

1982-04-27

Sutto, Anton H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603402, 2603478, 528370, C07C 6800

Patent

active

043270352

ABSTRACT:
The present invention relates to a process for the preparation of carbonic acid esters of monoalcohols or polyalcohols, which is characterized in that ureas are reacted with monoalcohols or with polyalcohols in the molar ratio of at least 1:2, in the presence of a catalyst, at reaction temperatures between 120.degree. C. and 270.degree. C.
Accordingly, the present invention also relates to a process for the preparation of oligocarbonates and polycarbonates, which is characterized in that ureas are reacted with primary dialcohols in the molar ratio of about 1.5:1 to about 1:1.5, together with monoalcohols, in the presence of catalysts at reaction temperatures between 120.degree. C. and 270.degree. C.

REFERENCES:
patent: 2370571 (1945-02-01), Muskat et al.
patent: 2834799 (1958-05-01), Sowa
patent: 3642858 (1972-02-01), Frevel et al.
P. Ball et al., Angewandte Chemie (1980), 742-743.
A. Paquin, Z. Naturforschung 1, 518-523 (1946), The Conversion of Urea with Alcohols.
Wagner and Zook, Synthetic Organic Chemistry (1953), p. 647.
Smith, Open-Chain Nitrogen Compounds, vol. 1, p. 261 (1965), Benjamin, Inc. N.Y.

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