Process for the preparation of benzotriazoles

Details Process for the preparation of benzotriazoles Process for the preparation of benzotriazoles

1990-09-13

1994-01-04

Morris, Patricia L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548259, C07D24918

Patent

active

052761614

ABSTRACT:
2-(2-Hydroxyphenyl)-2H-benzotriazoles of the formula ##STR1## in which R is hydrogen, C.sub.1 -C.sub.12 alkyl or C.sub.1 -C.sub.4 alkoxy, 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 suitable o-nitroazo compound in the presence of a Pt, Pd, Pt/Pd or Rh hydrogenation catalyst and an alkylenediamine or an acyclic or cyclic polyalkylene polyamine in a halogenated or nonhalogenated aromatic hydrocarbon as solvent.

REFERENCES:
patent: 3978074 (1976-08-01), Jancis
patent: 4219480 (1980-08-01), White et al.
patent: 4230867 (1980-10-01), Kintopf et al.
patent: 4999433 (1991-03-01), Prestel et al.
patent: 5187289 (1993-02-01), Fukuoka et al.

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