Transesterification process

Details Transesterification process Transesterification process

1985-01-30

1987-05-05

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

560 25, 560 26, 560115, 560157, 560158, C07C125065, C07C125073

Patent

active

046634720

ABSTRACT:
A process for the transesterification of urethanes comprises reacting a urethane with an alcohol at elevated temperature in the presence of a Lewis base containing catalyst.
The process is particularly useful when the alcohol used is a polyol since the product of the transesterification is a polyurethane. Since urethanes can be generated from amines and organic carbonates using the methods of the prior art, the present invention provides processes for the manufacture of polyurethanes from amines which avoid the use of either phosgene or isocyanates both of which are extremely toxic.

REFERENCES:
patent: 3950285 (1976-04-01), Wolgemuth
Adams et al, Chemical Reviews, vol. 65 (1965) 567, 570, 571.
Gaylord et al, Jour. of Org. Chem., vol. 18, (1953) 1632-1637.

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