Preparation of acetalized azo dyes

Details Preparation of acetalized azo dyes Preparation of acetalized azo dyes

1992-06-05

1993-09-21

Ramsuer, Robert W.

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

Organic compounds

Azo

534581, 534831, 534856, C09B 4328

Patent

active

052470717

ABSTRACT:
Acetalized azo dyes are prepared by diazotizing an amine, coupling with a hydroxyalkyl-containing coupling component and subsequently reacting with a vinyl ether in a process which comprises carrying out the coupling reaction in a two-phase reaction mixture comprising water and an aromatic hydrocarbon, subsequently separating off the aqueous phase and reacting the azo dye, which is present in the organic phase, without intermediate isolation, with a vinyl ether in the presence of a polybasic carboxylic acid as catalyst.

REFERENCES:
patent: 3244753 (1966-04-01), Leary
patent: 4011209 (1977-03-01), De Feo et al.
patent: 4904765 (1990-02-01), Derber et al.

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