Process for the preparation of basic oxazine dyestuffs

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

1981-03-24

1982-12-07

Higel, Floyd D.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

544102, C09B 1900

Patent

active

043628737

ABSTRACT:
The invention relates to a process for the preparation of dyestuffs of the formula: ##STR1## in which R.sub.1 represents hydrogen, alkyl, alkenyl or aralkyl, R.sub.2 represents alkyl, alkenyl, cycloalkyl, aryl or aralkyl, R.sub.3 represents hydrogen, alkyl or alkoxy, R.sub.4 represents hydrogen, alkyl, aryl or aralkyl, R.sub.5 represents hydrogen or alkyl, R.sub.6 represents hydrogen, alkyl or alkoxy, R.sub.7 represents hydrogen or alkyl or forms with R.sub.6 a condensed benzene ring, and X.crclbar. represents an anion, which process comprises reacting a nitroso compound of formula (II) with an aminophenol of formula (III) or a nitroso compound of formula (IV) with a compound of formula (V): ##STR2## in which R.sub.1 to R.sub.7 have the same meanings as above, R'.sub.3, R'.sub.6 and R'.sub.7 each represents H or alkyl, R.sub.8 is a possibly substituted alkyl radical, and R.sub.9 is an alkoxy radical or a possibly substituted amino group. The reaction is effected in the presence of an anhydride such as acetic anhydride and the dyestuffs may be prepared without heating with excellent yields.

REFERENCES:
patent: 2741605 (1956-04-01), Zwilgmeyer
patent: 3681347 (1972-08-01), Herz et al.
patent: 3806504 (1974-04-01), Mundlos et al.
patent: 3894014 (1975-07-01), Baumann et al.
patent: 3928339 (1975-12-01), Mundlos et al.

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