METHOD OF PREPARING VAT DYES AND PIGMENTS CONTAINING PERYLENE FRAGMENT Russian patent published in 1999 - IPC

Abstract RU 2128200 C1

FIELD: chemical industry. SUBSTANCE: method comprises treating original compound of formula I: or II: in the presence of zinc dust and catalyst in aprotic dipolar solvent at 70-220 C and subsequently oxidizing reaction mixture. Catalyst is nickel (II) fluoride, chloride, bromide, iodide or sulfate, and promoter is alkali or alkaline-earth metal halide, or ammonium salt. EFFECT: increased yield of thee desired products. 72, 7 tbl

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RU 2 128 200 C1

Authors

Adonin N.Ju.

Starichenko V.F.

Rjabinin V.A.

Dates

1999-03-27—Published

1997-01-27—Filed