Process for the preparation of bis-styrylbenzenes

Details Process for the preparation of bis-styrylbenzenes Process for the preparation of bis-styrylbenzenes

1983-03-18

1988-11-15

Sutto, Anton H.

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

Organic compounds

Nitriles

558416, 560 76, C07C12164

Patent

active

047851287

ABSTRACT:
A fluorescent brightener is proposed which consists of 51-99% of an unsymmetrically substituted compound of the formula ##STR1## in which R and R.sub.1 are identical or different and, if R and R.sub.1 are identical, R.sub.1 must occupy a position in the phenyl ring to which it is bonded which differs from the position occupied by R in its phenyl ring, and in which R and R.sub.1 independently of one another are CN or a carboxylic acid ester group, and 49-1% of a symmetrically substituted compound of the formula ##STR2## in which R is as defined above and the two R's are bonded to identical positions in their phenyl rings, as are also agents which contain these fluorescent brighteners and the use of these fluorescent brighteners for the fluorescent brightening of, in particular, textile materials, preferably made of polymer. The said fluorescent brighteners are prepared by reacting terephthalaldehyde preferably with a correspondingly substituted benzylphosphonate and further reacting the resulting mixture of a correspondingly substituted 4-stilbene aldehyde and a symmetrical p-bis-styrylbenzene with a benzylphosphonate which differs from the benzylphosphonate first used.

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