METHOD OF PRODUCING O-CHLOROANILINE Russian patent published in 2017 - IPC C07C209/36 C07C211/52 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing o-chloroaniline, which can be used in fine organic synthesis. Method is carried out by catalytic reduction of o-nitrochlorobenzene with molecular hydrogen in presence of palladium catalysts, modified with white phosphorus, in atomic ratio of components Pd/P = 1:0.7–1:1.2 in a liquid dispersion medium in temperature range of 30–80 °C (303-353 K) and hydrogen pressure 1 isb.atm. Catalyst used is a palladium catalyst, formation of which is carried out in presence of carbon support - sibunite, and liquid dispersion medium used is toluene. Method enables to obtain an end product with high output and selectivity of 94.0–95.8 wt% at different temperatures (30–80 °C) without accumulation in large amounts of undesirable intermediate compounds: (o-chlorophenyl)hydroxylamine and products of its condensation (2,2'-dichloroazoxybenzene and 2,2'-dichloroazobenzene).

EFFECT: reduced amount of (o-chlorophenyl) hydroxylamine lowers explosion hazard of method.

1 cl, 3 dwg, 3 tbl, 18 ex