Patent · US Expired

4-Benzoxazolyl-4'-oxadiazolyl stilbene optical brighteners

US4142044A · kind A · utility

11Cited by

8References

4Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Dieter Gunther · Kelkheim, DE
Rudiger Erckel · Eppstein, DE
Erich Schinzel
Gunter Rosch · Bad Soden am Taunus, DE

Key dates

Filing date	Mar 4, 1977
Grant date	Feb 27, 1979
Priority date	—
Expiry date	Mar 4, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D263/57
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Compounds of the formula ##STR1## wherein X is O or S, A is a group of the formula ##STR2## and R.sub.1, R.sub.2 and R.sub.3 are non-chromophorous substituents. They are prepared by reacting a 4'-benzoxa(thia)zolyl-2-stilbene-4-carbonic acid chloride with an amidoxim containing the group R.sub.3 or by reacting a 4'-benzoxa(thia)zolyl-2-stilbene-4-amidoxime with an acid chloride containing the group R.sub.3. These compounds are used as optical brighteners.

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