Process for the preparation of 1,2,3-tricyanobenzene, phthalocyanines which are obtainable from 1,2,3-tricyanobenzene, and their use as pigments

US5386051A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunther Beck · Leverkusen, DE
• Bernd Kaletta · Langenfeld, DE

Key dates

• Filing date: Dec 10, 1993
• Grant date: Jan 31, 1995
• Expiry date: Dec 10, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B47/0678
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

1,2,3-Tricyanobenzene can be prepared in a good yield from fluorobenzonitriles by reaction with an alkali metal cyanide. This product can be converted into metal-free tetracyanophthalocyanines or into the corresponding metal complexes by tetramerisation, if appropriate in the presence of metals or metal compounds. These products are excellent organic pigments.