Diphosphines

US6566298B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Birgit Driessen-Holscher · Aachen, DE
• Joachim Kralik · Hanau, DE
• Inga Ritzkopf · Aachen, DE
• Christian Steffens
• Guido Giffels · Bonn, DE
• Claus Dreisbach
• Thomas Prinz · Neunburg vorm Wald, DE
• Walter Lange · Cologne, DE

Key dates

• Filing date: Aug 15, 2002
• Grant date: May 20, 2003
• Expiry date: Aug 15, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2531/827
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to the preparation and use as catalysts of diphosphines of the formula (I) in whichR is C6-C14-aryl or C4-C13-heteroaryl containing 1 to 3 heteroatoms selected from the group consisting of nitrogen, oxygen, and sulfur, wherein the aryl and heteroaryl radicals may optionally be substituted by halogen, C1-C6-alkyl, C1-C6-alkoxy, and/or trimethylsilyl, andR1 to R4, independently of one another, are each hydrogen, C1-C10-alkyl, C1-C10-alkoxy, F, Cl, or Br.