Process for producing 5-nitro-3,4-dihydro-1(H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate

US7202378B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Joachim Zechlin · Neuss, DE
• Kai Verkerk · Hilden, DE
• Dietmar Wastian · Dormagen, DE
• Katrin Joschek
• Tim Loddenkemper · Dormagen, DE
• Wilfried Pinke · Dormagen, DE
• Michael Schelhaas
• Georg Ronge · Mülheim an der Ruhr, DE

Key dates

• Filing date: Apr 7, 2006
• Grant date: Apr 10, 2007
• Expiry date: May 29, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate, in which 4-(2-nitrophenyl)-n-butyronitrile is converted to 4-(2-nitrophenyl)-n-butyric acid.