Preparation of optical brighteners

Details Preparation of optical brighteners Preparation of optical brighteners

1980-12-08

1983-04-19

Edmundson, F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

25230121, 260465D, 260465G, 260465K, C07C12164, C07C 64767, D06L 312, C11D 342

Patent

active

043805140

ABSTRACT:
A process for the preparation of unsymmetrically substituted optical brighteners of the general formula ##STR1## where X and Y independently of one another are hydrogen, fluorine, chlorine, cyano, C.sub.1 -C.sub.10 -alkoxycarbonyl, unsubstituted or substituted carbamyl or sulfamyl, a sulfonic acid aryl ester group, C.sub.1 -C.sub.10 -alkylsulfonyl or phenylsulfonyl, and at least one of X and Y is not hydrogen, and of mixtures of such optical brighteners, wherein terephthalaldehyde is reacted successively with a compound of the general formula IIa ##STR2## and a compound of the general formula IIb ##STR3## where X and Y have the above meanings and alkyl is preferably C.sub.1 -C.sub.4 -alkyl, in the presence of an alkali, in a solvent from which the monocondensation product precipitates.

REFERENCES:
patent: 3177208 (1965-04-01), Stilz et al.
patent: 3294570 (1966-12-01), Pommer et al.
patent: 3959340 (1976-05-01), Weber
patent: 4314820 (1982-02-01), Weber et al.
patent: 4316860 (1982-02-01), Marky

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