【発明の名称】N-メチルカルバメ-トの製法

Japanese Patent JPH0617356

B2

Process for the production of N-methylcarbamates:(wherein RO- is the radical of a substituted phenol or of a naphthol), wherein:- in a first reaction step methylamine and diphenyl carbonate are reacted with each other, operating in the liquid phase and as a continuous process, in order to form phenol and phenyl-N-methylurethane;- in a second reaction step phenyl-N-methylurethane, within the related reaction mixture outcoming from the first step, is thermally continuously decomposed, to yield a gaseous stream containing methyl isocyanate, from which the components different to methyl isocyanate are condensed off;- in a third step the methyl isocyanate stream, outcoming from the second step. after a possible preliminary condensation, is continuously fed and contacted with a solution of a substituted phenol or of a naphthol in an inert organic solvent, containing a basic catalyst, to form N-methylcarbamate (I);N-methylcarbamate (I) is finally recovered from the reaction mixture outcoming from the third step.

FURANKO RIBETSUCHI
FURANKO MIJIA
GIIDO GAROONA
UUGO ROMAANO

JP9568785A

March 09, 1994

May 07, 1985

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ENICHEM SINTESI

B01J31/00; B01J31/02; B01J31/12; C07C67/00; C07B61/00; C07C227/02; C07C239/00; C07C241/00; C07C265/04; C07C269/02; C07C269/04; C07C271/10; C07C271/44; C07D307/86; C07D317/14; C07D317/44; C07D317/46; C07D317/64; A61K; C07C; (IPC1-7): C07C271/44; C07C269/02

Kimura Masami

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