Process for the production of distyryl-biphenyl compounds
US5969204A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Dec 19, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07B37/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the production of compounds useful as fluorescent whitening agents of formula: ##STR1## in which X and Y, are as defined herein and n is 1 or 2, comprises A) diazotising one mole of an amine of formula: ##STR2## (2A) to produce a diazonium compound of the formula: ##STR3## (2) in which G.sub.1 is a counter ion; and diazotising one mole of an amine of formula: ##STR4## (3A) to produce a diazonium compound having the formula: ##STR5## (3); and B) reacting one mole of a divinyl compound having the formula: ##STR6## (4) with one mole of a compound having the formula (2) and with one mole of a compound having the formula (3), in the presence of an inorganic or organic palladium salt, or a mixture thereof, as catalyst-precursor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.