Process for the preparation of benzotriazoles

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

1995-07-12

1996-11-05

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

055719244

ABSTRACT:
2-(2-Hydroxyphenyl)-2H-benzotriazoles can be prepared particularly advantageously by catalytically reducing a suitable o-nitroazobenzene compound to the corresponding N-oxybenzotriazole compound in the presence of hydrazine hydrate, a metal catalyst selected from the group consisting of Raney-Ni and the noble metals, an organic or inorganic base, an organic solvent, and optionally water; followed by isolating said N-oxybenzotriazole compound and converting it to the corresponding 2-(2-hydroxyphenyl)-2H-benzotriazole.

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: 5276161 (1994-01-01), Prestel et al.
Chemical Abstract 111:214490u & 111:214491v, 1989.
Chemical Abstract 117:191853x of JP 04,159,267, Jun. 1992 (1989).
Organic Syntheses, vol. 67, pp. 187-192, 1988.
Chemical Abstract 117:251972x of JP 04,193,869, Jul. 1992.
Chemical Abstract 89(21):180008c of JP 53063379, Jun. 1978.

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