Preparation of diphenylmethane dicarbamates and polymethylene po

Details Preparation of diphenylmethane dicarbamates and polymethylene po Preparation of diphenylmethane dicarbamates and polymethylene po

1979-02-12

1980-05-13

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

260453P, C07C12504

Patent

active

042029864

ABSTRACT:
Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the condensation of N-aryl carbamic acid esters, such as ethylphenylcarbamate, with a carbonyl compound selected from formaldehyde, para-formaldehyde or trioxane at a temperature of between about ambient and 170.degree. C. in the presence of a Lewis acid intercalated in graphite and optionally in the presence of an inert solvent.

REFERENCES:
patent: 2946768 (1960-07-01), Klauke et al.
patent: 4146727 (1979-03-01), Shawl

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