Process for preparing distyrylbiphenyl compounds

US5929270A · kind A · utility

Assignee

• Ciba Specialty Chemicals Corporation · US

Inventors

• Dietmar Huglin · Eimeldingen, DE
• Robert Hochberg · Glückstadt, DE
• Oliver Becherer · Bad Kötzting, DE
• Reinhard Weigmann · Kandern, DE

Key dates

• Filing date: May 19, 1998
• Grant date: Jul 27, 1999
• Expiry date: May 19, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/76
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process is provided for the production of compounds having the formula: ##STR1## in which R is hydrogen, C.sub.1 -C.sub.5 alkyl, cyano or halogen; M is hydrogen or a salt-forming colorless cation; and n is 2; PA1 which process comprises reductively de-aminating a compound having the formula: ##STR2## in which R and n have their previous significance and M' is hydrogen, a salt-forming colorless cation or optionally substituted phenyl; and converting any optionally substituted phenyl group M' to a group M. The present invention also provides processes for the production of the compounds of formula (2) and various novel intermediates for use in the new processes. The compounds of formula (1) are useful as fluorescent whitening agents.