Process for the preparation of substituted 3,5-dichloro-2,4-difl

Details Process for the preparation of substituted 3,5-dichloro-2,4-difl Process for the preparation of substituted 3,5-dichloro-2,4-difl

1990-10-10

1992-01-14

Siegel, Alan

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

Organic compounds

Isocyanate esters

564417, 570147, C07C26300, C07C20900, C07C 2200

Patent

active

050812882

ABSTRACT:
Substituted 3,5-dichloro-2,4-difluoro-benzenes of the formula ##STR1## in which R represents nitro, amino (including the corresponding ammonium salts) or isocyanato, which can be prepared from 2,3,4,5-tetrachloro-nitrobenzene by means of the reaction, carried out initially, with alkali metal fluorides at elevated temperature in a polar, aprotic solvent, starting from a crude 2,3,4,5-tetrachloro-nitrobenzene containing 2,3,5,6-tetrachloro-nitrobenzene and/or 2,3,4,6-tetrachloro-nitrobenzene, and substituted 3,5-dichloro-2,4-difluoro-benzene being isolated from the reaction mixture at the nitro stage or, after reduction of the nitro group, at the amino stage or, after reduction and phosgenation of the amino group, at the isocyanate stage.

REFERENCES:
patent: 3294629 (1966-12-01), Pyne et al.

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