Patent · US Active

Terrylene and quaterrylene derivatives

US8569500B2 · kind B2 · utility

0Cited by

7References

12Claims

0Family size

Assignee

BASF SE

Inventors

Neil Gregory Pschirer · Mainz, DE
Jianqiang Qu · Shanghai, CN
Martin Koenemann · Ludwigshafen, DE

Key dates

Filing date	Aug 3, 2010
Grant date	Oct 29, 2013
Priority date	—
Expiry date	Jul 19, 2031

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B5/62
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing a rylenetetracarboxylic dianhydride, or a salt thereof having application formula Ib by subjecting a rylenetetracarboximide of application formula II to a hydrolysis under alkaline conditions in the presence of a polar organic solvent and removing the rylenetetracarboxylic dianhydride Ib from any rylenetetracarboxylic monoimide monoanhydride of application formula Ia which is formed to form the rylenetetracarboxylic dianhydride, or the salt thereof having formula Ib; or hydrolyzing the rylenetetracarboximide of application formula II under conditions that form the compound of application formula Ib and substantially no rylenetetracarboxylic monoimide monoanhydride of application formula Ia.

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