C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/468.2
C07C 269/04 (2006.01) C07C 271/18 (2006.01) C07C 271/50 (2006.01) C07C 271/64 (2006.01) C07F 1/00 (2006.01)
Patent
CA 2011856
T 321 FF ABSTRACT PROCESS FOR PREPARING CARBAMATES, AND INTERMEDIATES THEREIN The invention provides a process for the preparation of N-benzoylcarbamates of general formula Image ( I ) wherein Rl represents a hydrogen atom, a halogen atom, a Cl-4 alkyl group, a C1-4 alkoxy group or a trifluoromethyl group, R2 represents a halogen atom, a Cl-4 alkyl group, a C1-4 alkoxy group or a trifluoromethyl group, R3 represents a hydrogen atom, a halogen atom, a methyl group or a trifluoromethyl group, and R represents a Cl-8 alkyl group optionally substituted by one or more halogen atoms or a phenyl group optionally substituted by one or more substituents selected from halogen atoms and methyl groups, characterised by reacting an alkali metal PS16004 salt of a benzamide of general formula Image (II) wherein R1, R2 and R3 are as defined above, with a carbonate of formula RO-CO-OR (III) wherein R is as defined above, in the presence of an inert solvent, and neutralising the resulting alkali metal salt of the compound of formula I; and (intermediate) alkali metal salts of the compounds of formula I. PS16004
de Waal Jannetje
Verbrugge Pieter Adriaan
Shell Canada Limited
Swabey Ogilvy Renault
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