Process for the preparation of 2-nitro-5-fluoro- or -5-chlorophe

Details Process for the preparation of 2-nitro-5-fluoro- or -5-chlorophe Process for the preparation of 2-nitro-5-fluoro- or -5-chlorophe

1992-10-07

1993-07-13

Lone, Werren B.

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

Organic compounds

Oxygen containing

C07C20520

Patent

active

052275353

ABSTRACT:
The present invention relates to a process for the preparation of isomerically pure 2-nitro-5-fluoro- or -5-chlorophenol, by reacting 2,4-difluoronitrobenzene or 2,4-dichloronitrobenzene with aqueous alkali metal or alkaline earth metal hydroxide solution or suspension in the absence of organic solvents or other solubility promoting substances at temperatures from about 20.degree. C. to about 190.degree. C., adjusting the pH of the reaction mixture to about 1 to about 6 by the addition of acid, steam distilling the resultant product and isolating it from the distillate after cooling.

REFERENCES:
patent: 3461173 (1969-04-01), Peterson
patent: 3928470 (1975-12-01), Soula et al.
patent: 4310711 (1982-01-01), Muller et al.

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