Back to results
US 5,332,861 AGranted
Process for preparing distyrylbiphenyl compounds
AssigneeCiba-Geigy Corporation
InventorLeonardo Guglielmetti
Life of this patent
Estimating the term…
Abstract
Process for preparing distyrylbiphenyl compounds by condensation of a substituted or unsubstituted 4,4'-bis(dialkoxyphosphonomethyl)biphenyl compound with a substituted or unsubstituted benzaldehyde in liquid ammonia as the solvent and in the presence of strong bases; and the use of these distyrylbiphenyl compounds as fluorescent whitening agents.
Claims16
A process for preparing distyrylbiphenyl compounds of the formula (1) ##STR8## by condensation of a compound of the formula (2) ##STR9## with a compound of the formula (3) ##STR10## in which R.sub.1 is hydrogen, C.sub.1 -C.sub.5 alkyl or halogen;
- R.sub.2 is C.sub.1 -C.sub.8 alkyl;
- M is a salt-forming colourless cation;
- n is 2 or 4;
- m is 0 or 2;
- and
- p is 0 or 1;
- provided m+p is 2 or 4,
- which comprises carrying out the condensation in liquid ammonia in the presence of strongly alkaline substances.
5 more elements
Dependencies are inferred from the claim text.