Process for producing diphenylmethane dicarbamates

Details Process for producing diphenylmethane dicarbamates Process for producing diphenylmethane dicarbamates

1983-12-07

1985-11-12

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

560 21, 260465D, C07C125073, C07C125075

Patent

active

045529744

ABSTRACT:
A process for producing a diphenylmethane dicarbamate by reacting an N-phenylcarbamate with a methylenating agent is disclosed. The process is carried out by condensing N-phenylcarbamate in two steps using a combination of two different types of acid catalysts. The catalysts exhibit a strong catalyzing effect and yet can be readily separated from the reaction mixture. The process produces dineuclear diphenylmethane dicarbamates in high selectivity. The acid catalysts can be easily recovered from the reaction mixtures and put to another use.

REFERENCES:
patent: 4146727 (1979-03-01), Shawl et al.
patent: 4243815 (1981-01-01), Merger et al.
patent: 4319018 (1982-03-01), Miyata et al.
Merger, Chem. Abs., vol. 99, (1983), 140572g.

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