Process for the production of n,n'-bis-(3-aminophenyl)-ureas

Details Process for the production of n,n'-bis-(3-aminophenyl)-ureas Process for the production of n,n'-bis-(3-aminophenyl)-ureas

C - Chemistry, Metallurgy

07

C

260/546.9

C07C 275/40 (2006.01) C07C 273/18 (2006.01)

Patent

CA 2003107

The present invention is directed to a process for the preparation of N,N'-bis-(3-aminophenyl)-ureas corresponding to formula (I) (see fig. I) wherein R represents a linear or branched C1-C6 alkyl group which is in the 2-, 4- and/or 6-position, characterized in that the corresponding phenylene diamines are reacted with urea in a molar ratio of greater than 2:1 in chlorobenzene as solvent.

L'invention en question concerne un procédé de préparation de N,N'-bis-(3-aminophényl)urées qui correspondent à la formule (I) (voir la figure 1), dans laquelle R représente un alkyle C1-C6, linéaire ou ramifié, en position 2-, 4- et/ou 6-, et qui sont caractérisées par le fait que les diaminophénylènes correspondants réagissent avec l'urée selon un rapport molaire supérieur à 2/1 dans le chlorobenzène utilisé comme solvant.

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