0395144-A1 is referenced by 30 patents and cites 5 patents.

A process for preparing aromatic ureas having the general formula I: wherein each of R and R independently represents a hydrogen atom, an alkyl or cycloalkyl group, R represents an optionally substituted aryl or heteroaryl group, and R represents an alkyl, alkenyl, alkynyl or alkoxy group, or an optionally substituted cycloalkyl, aryl or heteroaryl group, which process comprises reacting an aromatic amine having the general formula II: wherein R and R are as hereinbefore defined, or a symmetrical aromatic urea having the general formula III: wherein R and R are as hereinbefore defined, with an amine having the general formula IV: wherein R and R are as hereinbefore defined, and carbon monoxide in the presence of a catalyst comprising: a) palladium; b) an organo-nitrogen or organo-phosphorous ligand having a lone pair of electrons; and c) a metal salt comprising a cation of a metal selected from the group consisting of copper, iron, vanadium chromium, zinc, tin, uranium and cerium, and an anion of an acid having a pK of less than 2, except of a hydrohalogenic acid.

Title
A process for the preparation of aromatic ureas.
Application Number
EP19900200959 19900418
Publication Number
0395144 (A1)
Application Date
April 18, 1990
Publication Date
October 31, 1990
Inventor
Terlouw Willem
NL
Goodall Brian Leslie
US
Assignee
Shell Int Research
NL
IPC
C07C 275/28
C07C 273/18
C07D 261/00
C07C 273/00
C07D 261/14
C07C 273/18
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