Process for the preparation of acid dyestuffs of low electrolyte

Details Process for the preparation of acid dyestuffs of low electrolyte Process for the preparation of acid dyestuffs of low electrolyte

1984-03-15

1986-01-28

Hollrah, Glennon H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260386, 260389, 260391, 260393, 260394, 260395, C09B 1110, C09B 116

Patent

active

045669996

ABSTRACT:
Process for the preparation of triphenylmethane dyestuffs of low electrolyte content, of the formula (A) ##STR1## wherein R.sub.1 and R.sub.2 each denote hydrogen, C.sub.1 -C.sub.4 -alkyl, benzyl or sulfobenzyl, R.sub.3 and R.sub.4 each denote hydrogen, C.sub.1 -C.sub.4 -alkyl or --SO.sub.3 H and R.sub.5 denotes a phenyl, chlorophenyl, dialkylaminophenyl, alkyldialkylaminophenyl, alkoxyphenylaminophenyl, sulfoanilido, sulfanilidophenyl, disulfobenzylaminophenyl, disulfophenyl, disulfohydroxyphenyl, sulfonaphthyl, disulfonaphthyl, hydroxydisulfonaphthyl or alkylphenylaminosulfonaphthyl group, the dyestuff molecule containing at least one sulfonic acid group, in the form of their ammonium or alkaline earth metal salts, by dissolving the corresponding leuco-compounds of the dyestuffs of the formula (A) with aqueous ammonia solution or mixtures of aqueous ammonia solution and alkali metal hydroxide solution, and then

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Scanlan, J. Am. Chem. Soc., 1935, pp. 887-892, "The Preparation and Spectrophotometric Study of the Lower Basic Members".
Scanlan, J. Am. Chem. Soc., 1936, pp. 1427-1429, "The Magenta Series, II., Some Higher Basic Members".

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