Patent · US Expired

Stilbene derivatives

US4684744A · kind A · utility

0Cited by

4References

5Claims

0Family size

Assignee

Ciga-Geiby Corporation · US

Inventors

Klaus Artz · Muttenz, CH
Hans R. Meyer · Binningen, CH
Dieter Reinehr · Kandern, DE
Kurt Weber · Elgg, CH

Key dates

Filing date	Mar 21, 1985
Grant date	Aug 4, 1987
Priority date	—
Expiry date	Mar 21, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C255/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Stilbene derivatives of the formula ##STR1## wherein X is chlorine or bromine, R.sub.1 is hydrogen, carboxyl, cyano, C.sub.1 -C.sub.6 -alkyl or a non-chromophorically esterified carboxyl group, and R.sub.2 and R.sub.3 independently of one another are each hydrogen, unsubstituted or non-chromophorically substituted C.sub.1 -C.sub.6 -alkyl or C.sub.3 -C.sub.4 -alkenyl, or a non-chromophoric substituent of the 2nd order. They are valuable intermediates for producing optical brighteners of the 4,4'-disubstituted stilbene series.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.