Process for the preparation of diphenylmethane dicarbamates and

Details Process for the preparation of diphenylmethane dicarbamates and Process for the preparation of diphenylmethane dicarbamates and

1978-10-20

1979-07-24

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

528242, 528266, C07C12504

Patent

active

041623622

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 formaldehyde, para-formaldehyde or trioxane in the presence of an organic sulfonic or halogenated organic sulfonic acid which has an acid concentration of at least 75 percent, at temperatures of from ambient to about 170.degree. C. and optionally in the presence of an inert solvent.

REFERENCES:
patent: 2946768 (1960-07-01), Klauke et al.
patent: 3919279 (1975-11-01), Rosenthal et al.
patent: 3962302 (1976-06-01), Rosenthal et al.
patent: 4014914 (1977-03-01), Pistor et al.

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