Fluorenol catalyzed reduction of o-nitroazobenzenes and 2-aryl-2

Details Fluorenol catalyzed reduction of o-nitroazobenzenes and 2-aryl-2 Fluorenol catalyzed reduction of o-nitroazobenzenes and 2-aryl-2

1992-12-15

1993-11-16

Morris, Patricia L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548259, C07D24920

Patent

active

052625419

ABSTRACT:
A process for producing 2-aryl-2H-benzotriazole by reducing an o-nitroazobenzene with a saccharide having an aldehyde group as a reducing agent in the presence of fluorenol as a catalyst and a base in solution. The reaction is conducted at a temperature of from about 60.degree. C. to about 80.degree. C. The reaction time and amount of catalyst is significantly reduced compared to the use of an aromatic ketone catalyst. The invention also provides a method for producing 2-aryl-2H-benzotriazole by reducing a 2-aryl-2H-benzotriazole-N-oxide intermediate with a saccharide having an aldehyde group as a reducing agent, in the presence of fluorenol under similar conditions.

REFERENCES:
patent: 2362988 (1944-11-01), Conzetti
patent: 3773751 (1973-11-01), Brooks, Jr.
patent: 4642350 (1987-02-01), Davitz et al.
patent: 4780541 (1988-10-01), Seino
patent: 4835284 (1989-05-01), Seino

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