Method for increasing the 4,4'dicarbamate isomer of the diphenyl

Details Method for increasing the 4,4'dicarbamate isomer of the diphenyl Method for increasing the 4,4'dicarbamate isomer of the diphenyl

1979-03-22

1980-10-28

Breitenstein, G. T.

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

Organic compounds

Carboxylic acid esters

528242, 528266, 560 24, C07C12504

Patent

active

042308771

ABSTRACT:
A method for increasing the 4,4' disubstituted isomer of the diphenylmethane dicarbamates produced by the acid catalyzed condensation of an N-aryl carbamic acid ester, such as ethylphenylcarbamate, with a carbonyl compound, such as formaldehyde, which comprises carrying out the condensation in a single phase system with a dilute solution of the N-aryl carbamic acid ester in an inert solvent having a dielectric constant of at least 20 at 20.degree. C. The solvent must have good solubility for the carbamates, which carbamates are employed in the solvent at concentrations of from about 0.1 to 50 weight percent to provide a product enriched with the 4,4'-diphenylmethane dicarbamate isomer.

REFERENCES:
patent: 4146727 (1979-03-01), Shawl et al.

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