Process for the preparation of 5-fluoro-2-nitrobenzoic acid

Details Process for the preparation of 5-fluoro-2-nitrobenzoic acid Process for the preparation of 5-fluoro-2-nitrobenzoic acid

1996-06-20

1998-05-26

Gerstl, Robert

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

Organic compounds

Carboxylic acids and salts thereof

C07C20558

Patent

active

057568316

ABSTRACT:
5-Fluoro-2-nitrobenzoic acid having low contents of 3-fluoro-2-nitro-benzoic acid is prepared in a simple manner by nitrating 3-fluorobenzoic acid in an anhydrous medium using an anhydrous nitrating acid and isolating and purifying 5-fluoro-2nitro-benzoic acid, by taking 7.5 to 15 parts by weight of water, based on 1 part by weight of 3-fluorobenzoic acid used, introducing the reaction mixture reacted to exhaustion into this volume of water taken, filtering off the precipitate formed and washing it with water.

REFERENCES:
patent: 5543550 (1996-08-01), Rapp et al.
Ege, Liebigs Ann. Chem 1976 pp. 946,960, 1976.
Wiberg, Laboratory Technique in Organic Chemistry p.99, 1960.
J. Farmer et al, Tetrahedron Letters, vol. 29, No. 40, pp. 5105-5108 (1988).
H. Slothouwer, Recueil Des Travaux Chimiques De Pays-Bas, vol. 33, pp. 324-342 (1914).

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