Method for the preparation of biphephos

US9127030B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Burkard Kreidler · Recklinghausen, DE
• Dirk Fridag · Haltern am See, DE
• Bernhard Schemmer · Haltern am See, DE
• Bjoern Wechsler · Borken, DE
• Andrea Christiansen · Neu-Ulm, DE
• Doris Neumann · Offenbach, DE

Key dates

• Filing date: Dec 22, 2011
• Grant date: Sep 8, 2015
• Expiry date: Dec 22, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/65746
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for producing 6,6′-[(3,3′-di-tert-butyl-5,5′-dimethoxy-1,1′-biphenyl-2,2′diyl)bis(oxy)]bis(dibenzo[d,f][1,3,2]dioxaphosphepine), abbreviated to biphephos (see formula 1), with low chlorine content.