Process for the preparation of urea derivatives and catalyst...

Details Process for the preparation of urea derivatives and catalyst... Process for the preparation of urea derivatives and catalyst...

C - Chemistry, Metallurgy

07

C

260/547, 252/63.

C07C 273/18 (2006.01) B01J 31/04 (2006.01) B01J 31/18 (2006.01) C07C 275/28 (2006.01) C07C 275/30 (2006.01)

Patent

CA 1310953

T 108 A B S T R A C T PROCESS FOR THE PREPARATION OF UREA DERIVATIVES AND CATALYST SYSTEM The invention relates to a process for the preparation of urea derivatives of the general formula Image (I) wherein R is an alkyl group and X is a halogen atom, an alkyl-, alkoxy-, aryloxy-, cyano-, ester- or trifluoromethyl group and n is from 0 to 5, which comprises reacting an aromatic nitro compound of the general formula Image (II) wherein X and n are as defined above with carbon monoxide and an amine HNR2 wherein R is an alkyl group, in the presence of a catalyst system comprising (a) 8 group VIII noble metal or a compound thereof, (b) a bidentate ligand and (c) an acid having a pKa of more than 2 or a transition metal salt of said acid. EIRH04

538117

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