Patent ID: 6362380
Filing Date: 2002-03-26
Classification: C07B,C07C

Abstract:
A process for preparing 2-nitrobiphenyls of the formula I where R is halogen, Râ€² or ORâ€², where Râ€² is a C-organic radical which may carry groups inert under the reaction conditions, n is 0, 1, 2 or 3, and, in the case of n being 2 or 3, the radicals R are the same or different, which comprises reacting a chloronitrobenzene of the formula II in the presence of a base and of a palladium catalyst selected from the group consisting of:a) palladium triarylphosphine complex having palladium in the oxidation state zero, b) palladium salt in the presence of triarylphosphine as complex ligand, and c) metallic palladium which is optionally deposited on supports, in the presence of triarylphosphine, in a solvent with a phenylboronic acid (IIIa) or an alkyl ester thereof of the formula IIIb where R1 is C1-C6-alkyl, or an anhydride thereof.