Process for the preparation of bis-(ethoxycarbonylamino)...

Details Process for the preparation of bis-(ethoxycarbonylamino)... Process for the preparation of bis-(ethoxycarbonylamino)...

C - Chemistry, Metallurgy

07

C

C07C 271/28 (2006.01) C07C 263/04 (2006.01) C07C 265/14 (2006.01) C07C 269/04 (2006.01)

Patent

CA 2072034

Mo3746 A PROCESS FOR THE PREPARATION OF BIS-(ETHOXYCARBONYLAMINO)TOLUENES AND FOR THE PREPARATION OF DIISOCYANATOTOLUENES THEREFROM ABSTRACT OF THE DISCLOSURE A process for the preparation of bis-(ethoxycarbonyl- amino)-toluenes in which a diaminotoluene is reacted with diethylcarbonate in the presence of a catalyst at 100 to 300°C with simultaneous or subsequent removal of the alcohol formed. The diethylcarbonate being used in an at least 5-times molar excess based on the amino groups of the diaminotoluene. The bis-(ethoxycarbonylamino) toluenes formed are isolated in the form of crystals of great purity obtained after cooling of the reaction mixture. The resulting bis-(ethoxycarbonylamino)- toluenes may then be used as starting materials for the preparation of diisocyanatotoluenes. Le A 28 489

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