Novel stilbene compounds and process for the manufacture thereof

Details Novel stilbene compounds and process for the manufacture thereof Novel stilbene compounds and process for the manufacture thereof

1980-09-26

1982-01-12

Demers, Arthur P.

Harness for working animal

25230127, C07D40514, C07D40914, C07D41314

Patent

active

043106650

ABSTRACT:
Compounds of the formula ##STR1## wherein X is O or S, R.sub.1 and R.sub.2 each are hydrogen, fluorine, chlorine, phenyl, alkyl, alkoxy, dialkylamino, trialkylammonium, acylamino or optionally functionally modified carboxy or sulfo groups, two adjacent radicals R.sub.1 and R.sub.2 optionally forming together a phenylene, a lower alkylene or a 1,3-dioxapropylene group; and A is a group of the formulae ##STR2## in which R.sub.3 is an alpha-, beta- or gamma-pyridyl, pyridyl-methylene, thiophenyl, furanyl, benzofuranyl, pyrazinyl, pyrimidinyl or pyridazinyl group. These compounds, which are suitable as optical brighteners, are prepared by reaction of a compound of the formula ##STR3## with a compound of the formula

REFERENCES:
patent: 3644345 (1972-02-01), Siegrist et al.
patent: 4142044 (1979-02-01), Gunther et al.

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