Process for preparing 2,4-dichloro-3-alkyl-6-nitrophenols

Details Process for preparing 2,4-dichloro-3-alkyl-6-nitrophenols Process for preparing 2,4-dichloro-3-alkyl-6-nitrophenols

1991-05-29

1992-08-04

Lone, Werren B.

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

Organic compounds

Oxygen containing

568713, C07C20526

Patent

active

051361094

ABSTRACT:
2-4-Dichloro-3-alkyl-6-nitrophenols which are useful as intermediate of cyan couplers in color photography are prepared by sulfonating 4-chloro-3-alkyl-phenols to obtain 5-chloro-4-alkylhydroxybenzenesulfonic acids, chlorinating the acids in an aqueous phase to obtain 3,5-dichloro-4-alkyl-2-hydroxybenzenesulfonic acids and nitrating the sulfonic acids.

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patent: 4670608 (1987-06-01), Paetz et al.
patent: 4731320 (1988-03-01), Sasaki et al.
Patent Abstracts of Japan, Abstract No. 61-57536, vol. 10, No. 219, Jul. 31, 1986, p. 104 C 363.
Chemical Abstracts, vol. 100, No. 13, Mar. 26, 1984, p. 611 Abstract No. 102932f.
Chemical Abstracts, vol. 106, No. 5, Feb. 2, 1987, p. 503 Abstract No. 32565m.
Patent Abstracts of Japan, vol. 6, No. 139, Jul. 28, 1982, p. 139 C 116, abstract No. 57-64646.

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