Process for the preparation of N,N'-substituted ureas

Details Process for the preparation of N,N'-substituted ureas Process for the preparation of N,N'-substituted ureas

1995-05-26

1996-04-16

Ford, John M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544208, 544211, 544321, 544323, 544332, C07D25146, C07D25152, C07D23969

Patent

active

055084028

ABSTRACT:
A process for the preparation of substituted benzenes or benzenesulfonic acid and its derivatives comprising diazotisation of an aminobenzene or ortho-amino-benzenesulfonic acid derivative followed by homogeneous palladium-catalysed coupling with an olefine and heterogeneous palladium-catalysed hydrogenation of the olefinic substituent, wherein the homogeneous catalyst is reduced and precipitated as metal after the coupling in the reaction mixture and used as a heterogeneous palladium catalyst for the hydrogenation step. The process is particular suitable for the preparation N-benzenesulfon-N'-triazinyl-urea herbicides.

REFERENCES:
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