Patent · US Expired

Benzimidazo-[1,2-a]-quinolines

US4219651A · kind A · utility

1Cited by

5References

1Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Dieter Gunther · Kelkheim, DE
Rudiger Erckel · Eppstein, DE
Horst Fruhbeis · Kelkheim, DE

Key dates

Filing date	Sep 2, 1977
Grant date	Aug 26, 1980
Priority date	—
Expiry date	Sep 2, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D471/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Benzimidazo-[1,2-a]-quinolines of the formula ##STR1## In the solid and dissolved state, the compounds of the invention are strongly fluorescing from reddish-blue to red, depending on the substitution. The compounds can be used as optical brighteners and as fluorescent dyestuffs. Furthermore they are valuable intermediates for the preparation of optical brighteners and fluorescing dyestuffs. They are distinguished by a very good fastness to light.

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