Process for the manufacture of basic oxazine dyes

Details Process for the manufacture of basic oxazine dyes Process for the manufacture of basic oxazine dyes

1975-04-14

1977-04-19

Meyers, Albert T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D26512

Patent

active

040187632

ABSTRACT:
A process for the preparation of basic oxazine dyes of the formula ##STR1## wherein R represents a low molecular alkoxy or alkyl group which is substituted or unsubstituted, R.sub.1 represents a low molecular alkyl group which is substituted or unsubstituted, R.sub.2 represents a low molecular alkyl group which is substituted or unsubstituted or an aryl radical, and each of R.sub.3 and R.sub.4 independently represents hydrogen or a low molecular alkyl radical which is substituted or unsubstituted, and R.sub.1 may be attached to R.sub.2 and R.sub.3 to R.sub.4 through a heteroatom, and wherein the ring a can carry further non-ionogenic substituents or a fused benzene ring, and X.sup.- represents an anion, which process comprises treating a compound of the formula ##STR2## wherein R.sub.1, R.sub.2 and a have the meanings previously assigned to them, with nitrous acid in a polar, water-miscible solvent and adding to the resultant nitrosation mixture, without isolating the nitroso compound, a diamine of the formula ##STR3## wherein R, R.sub.3 and R.sub.4 have the indicated meanings and each of R.sub.5 and R.sub.6 represents hydrogen or a low molecular alkyl group.

REFERENCES:
patent: 3048586 (1962-08-01), Girard
patent: 3629248 (1971-12-01), Schafer et al.
patent: 3681347 (1972-08-01), Herz et al.
Organic Syntheses, vol. 2, Ed. by Blatt, 1943, John Wiley & Sons Inc., London, pp. 223-225.

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