Process for the manufacture of basic oxazine dyestuffs

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

1977-12-21

1980-04-01

Ford, John M.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

C07D26528

Patent

active

041962869

ABSTRACT:
Process for the manufacture of a basic oxazine dyestuff of the formula (1) ##STR1## in which R, R.sub.2 and R.sub.3 denote alkyl with 1 to 4 carbon atoms and R.sub.1 denotes H or alkyl with 1 to 4 carbon atoms, or R and R.sub.1, or R.sub.2 and R.sub.3, conjointly with the amine nitrogen also form a saturated 5-membered or 6-membered ring, which optionally contains further hetero-atoms, R.sub.4 denotes H or methyl and X .sup..crclbar. ##STR2## in which the R's, independently of one another, and R.sub.1 and R.sub.4 have the meaning indicated under formula (1), is nitrosylated in a cyclic ether, sulpholane or an alkyl-substituted amide, optionally mixed with water or an aliphatic alcohol, and the resulting suspension, which contains the nitroso compound, is subjected, without intermediate isolation of the said nitroso compound, to a condensation reaction with an aminophenol of the formula (3) ##STR3## in which R.sub.2 and R.sub.3 have the meaning indicated under formula (1).

REFERENCES:
patent: 3681347 (1972-08-01), Herz et al.
patent: 3806504 (1974-04-01), Mundlos et al.
patent: 3894012 (1975-07-01), Baumann et al.
patent: 3928339 (1975-12-01), Mundlos et al.
patent: 3972879 (1976-08-01), Psaar
patent: 4018763 (1977-04-01), Moser et al.

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