Process for the selective preparation of 4,4-methylene-bis-(N-ph

Details Process for the selective preparation of 4,4-methylene-bis-(N-ph Process for the selective preparation of 4,4-methylene-bis-(N-ph

1992-06-25

1995-01-24

Killos, Paul

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

Organic compounds

Carboxylic acid esters

C07C26100

Patent

active

053844246

ABSTRACT:
The present invention relates to a process for the selective preparation of 4,4-methylene-bis-(N-phenylalkylcarbamate) which comprises condensing N-phenylalkylcarbamate with a methylating agent in the presence of an acidic ion-exchange resin or an aqueous acid as a catalyst and a non polar aprotic solvent and filtrating a condensation product at a temperature greater than the melting point of N-phenylalkylcarbamate to separate 4,4-methylene-bis-(N-phenylalkylcarbamate).

REFERENCES:
patent: 2946768 (1960-07-01), Klauke
patent: 4162362 (1979-07-01), Shawl
patent: 4287132 (1981-09-01), Mameniskis

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