Process for the preparation of 2,4- or 2,6-dihalogeno-aniline

Details Process for the preparation of 2,4- or 2,6-dihalogeno-aniline Process for the preparation of 2,4- or 2,6-dihalogeno-aniline

1991-11-26

1992-09-08

Elmore, Carolyn

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

Organic compounds

Chalcogen in the nitrogen containing substituent

544172, 544395, 546192, 546238, 548572, 548577, 560 47, 564393, 564394, 564412, 564413, 564442, C07C20978

Patent

active

051459582

ABSTRACT:
2,4- or 2,6-dihalogeno-aniline can be prepared by reacting an amino-benzoic acid ester of the formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 have the meanings indicated in the description, with 2-2.5 moles of a chlorinating or brominating agent in an inert reaction medium at a temperature of 40.degree.-160.degree. C. and subsequently hydrolyzing and decarboxylating the dihalogenated amino-benzoic acid ester.

REFERENCES:
patent: 3801636 (1974-04-01), Harrom
patent: 4182877 (1980-01-01), Harris et al.
patent: 4447647 (1984-05-01), Werner et al.
Acharya et al., Chem Abs. 84: 164351a, 1976.
Liebenow, et al., Chem Abs. 103: 37181f, 1985.
Cirera et al., Chem Abs. 104: 109177e, 1986.
Organic Synthesis, vol. 24, pp. 47-53 John Wiley & Sons, Inc., New York, (1945).
Receuil Des Travaux Chimiques Des Pays-Bas, vol. 78, No. 7, pp. 534-542 C. Van Det Stelt et al. (1959).
Chemical Abstracts, vol. 97, No. 19, p. 675 (1982).

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