Process for the preparation of benzotriazole derivatives

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

1989-09-26

1991-03-12

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548261, C07D24920

Patent

active

049994336

ABSTRACT:
Hologenated 2-(2-hydroxyphenyl)-2H-benzotriazoles of the formula ##STR1## in which X is halogen, R.sub.1 is hydrogen, C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.6 cycloalkyl, phenyl or phenyl-C.sub.1 -C.sub.4 alkyl and R.sub.2 is C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.6 cycloalkyl, phenyl, phenyl-C.sub.1 -C.sub.4 alkyl or a group --C.sub.n H.sub.2n --COOR.sub.3, in which n is 0 to 4 and R.sub.3 is hydrogen or C.sub.1 -C.sub.12 alkyl, 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.

REFERENCES:
patent: 3978074 (1976-08-01), Gancis
patent: 4219480 (1980-08-01), White et al.
patent: 4230867 (1980-10-01), Kintopf et al.

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