Method for producing bisbenzoxazoles

US8067612B2 · kind B2 · utility

Assignee

• Clariant Finance (BVI) Limited · VG

Inventors

• Matthias Krull · Harxheim, DE
• Alexander Lerch · Gelnhausen, DE
• Roman Morschhaeuser · Mainz, DE
• Norbert Beye · Kelkheim, DE
• Hanspeter Gethoeffer · Budenheim, DE
• Helmut Ritter · Wuppertal, DE
• Sarah Schmitz · Duisburg, DE

Key dates

• Filing date: Oct 5, 2007
• Grant date: Nov 29, 2011
• Expiry date: Oct 21, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D413/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing bisbenzoxazoles that are interconnected by means of a system of conjugated double bonds, according to which o-aminophenols are reacted with dicarboxylic acids, the carboxyl groups of which are interconnected via a double bond or a system of conjugated double bonds, to form an ammonium salt, said ammonium salt being converted in the presence of dehydrogenating catalysts and solvents with a low dielectric loss into benzoxazol by means of microwave radiation.