Process for the preparation of benzotriazole derivatives

Details Process for the preparation of benzotriazole derivatives Process for the preparation of benzotriazole derivatives

Category

C - Chemistry, Metallurgy

Subcategory

07

Subsubcategory

D

CPC

260/313.1

IPC codes

C07D 249/20 (2006.01)

Type

Patent

Patent number

CA 1337939

Description

Halogenated 2-(2-hydroxyphenyl)-2H-benzotriazoles of the formula Image I, in which X is halogen, R1 is hydrogen, C1-C12alkyl, C5-C6cycloalkyl, phenyl or phenyl-C1-C4alkyl and R2 is C1-C12alkyl, C5-C6cycloalkyl, phenyl, phenyl-C1-C4alkyl or a group -CnH2n -COOR3, in which n is 0 to 4 and R3 is hydrogen or C1-C12alkyl, can be prepared particularly advantageously by catalytic hydrogenation of a corresponding o-nitroazo compound in the presence of a hydrogenation catalyst consisting of 0.1 to 3 % of Pt on a support and of an organic amine.

Application Number

613306

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