Process for producing 2,4-dichloro-3-alkyl-6-nitrophenol

Details Process for producing 2,4-dichloro-3-alkyl-6-nitrophenol Process for producing 2,4-dichloro-3-alkyl-6-nitrophenol

1989-03-07

1991-04-30

Lone, Werren B.

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

Organic compounds

Oxygen containing

568713, C07C20526, C07C20520

Patent

active

050120158

ABSTRACT:
2,4-Dichloro-3-alkyl-6-nitrophenol, which is a precursor of 2,4-dichloro-3-alkyl-6-aminophenol useful for the production of a cyan coupler to be used with a sensitive material in the field of a photography in color, is industrially advantageously produced by (a) nitration of 2,4,5-trichloro-3-alkylbenzene, followed by hydrolysis of the resulting 2,4,5-trichloro-3-alkyl-6-nitrobenzene, or (b) hydrolysis of 2,4,5-trichloro-3-alkylbenzene-6-sulfonic acid or a salt thereof, followed by nitration of the resulting 2,4-dichloro-3-alkylphenol-6-sulfonic acid or a salt thereof, the starting material usable for these processes being 4-alkylbenzenesulfonic acid or a salt thereof, which is easily available.

REFERENCES:
patent: 3903178 (1975-09-01), Nakamura et al.
patent: 3928470 (1975-12-01), Soula et al.
patent: 4038328 (1977-07-01), Pelster

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