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

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

C - Chemistry, Metallurgy

07

C

260/468.8

C07C 271/06 (2006.01)

Patent

CA 1136642

A METHOD FOR INCREASING THE 4,4' DICARBAMATE ISOMER OF THE DIPHENYLMETHANE DICARBAMATES DURING PREPARATION THEREOF ABSTRACT OF THE DISCLOSURE 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 com- pound, 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 atleast 20 at 20°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 per cent to provide a product enriched with the 4,4'-diphenylmethane dicarbamate isomer.

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