Process for the manufacture of cationic hydrazone dyes

Details Process for the manufacture of cationic hydrazone dyes Process for the manufacture of cationic hydrazone dyes

1976-04-27

1977-05-31

Curtis, Allen B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C09B 5500, C07D21172, C07D21506

Patent

active

040268853

ABSTRACT:
A process for the manufacture of dyes of the formula ##STR1## WHEREIN EACH OF R.sub.1 and R.sub.2 represents a methyl or ethyl radical, n is 1 or 2, X.sup.- is the charge equivalent of an anion and B represents a divalent radical which completes the ring a to form a pyridinium or quinolinium ring which is unsubstituted or substituted by chlorine or methyl, and the ring b is unsubstituted or substituted by low molecular alkyl or alkoxy or by halogen, which process comprises treating a compound of the formula ##STR2## WHEREIN R.sub.1, n, X.sup.-, B, a and b are as defined in formula (1) and m is 1 or 2, in aqueous medium at a pH of 12 or above, with dimethyl or diethyl sulphate, with the proviso that if m=1, at least 2 equivalents of dimethyl or diethyl sulphate are used.

REFERENCES:
patent: 3635955 (1972-01-01), Hansen et al.
patent: 3741982 (1973-06-01), Fujino et al.
patent: 3769279 (1973-10-01), Kuhlthau et al.
patent: 3829418 (1974-08-01), Raue et al.
patent: 3897418 (1975-07-01), Kuhlthau

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