Process for the production of 2-aryl-2h- benzotriazoles

Details Process for the production of 2-aryl-2h- benzotriazoles Process for the production of 2-aryl-2h- benzotriazoles

C - Chemistry, Metallurgy

07

D

260/313.1

C07D 249/20 (2006.01)

Patent

CA 1154779

Abstract of the Disclosure A process for the production of 2-aryl-2H-benzotriazoles having the formula I Image (I) comprises reducing and cyclizing the corresponding o-nitro- azobenzenes having the formula II Image (II) with hydrogen at a temperature in the range of about 20°C to about 100°C and at a pressure in the range of about 1 atmosphere to about 66 atmospheres in an alkaline medium at a pH over 10 in the presence of a nickel catalyst, preferably molybdenum-promoted Raney nickel. High yields of pure product are obtained directly with a concomitant reduction of undesired by-product and a reduction in effluent pollution problems.

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