Process for the preparation of tertiary phosphines

US5268479A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Othmar Stelzer · Wuppertal, DE
• Klaus-Peter Langhans · Wuppertal, DE
• Norbert Weferling · Hürth, DE

Key dates

• Filing date: Dec 2, 1992
• Grant date: Dec 7, 1993
• Expiry date: Dec 2, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/58
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process is specified for the preparation of tertiary phosphines of the formula EQU R'PR.sub.2 or R.sub.2 P--[CH.sub.2 ].sub.3 --PR.sub.2 in which R is an aryl, pyridyl or arylsulfonic acid group and R' is an aryl, pyridyl, arylsulfonic acid or n-butyl group, which comprises reacting phosphines of the formula EQU H.sub.n PR".sub.3-n or H.sub.2 P--[CH.sub.2 ].sub.3 --PH.sub.2 in which R" is hydrogen or an n-butyl, aryl or pyridyl group and n is 1 or 2 with a halogen compound of the formula EQU X-R, in which R has the abovementioned meaning and X is fluorine, chlorine or bromine, in the presence of powdered potassium hydroxide and dimethyl sulfoxide and/or dimethoxyethane at temperatures between 0 and 100.degree. C., at least 1 mol of potassium hydroxide being used per mole of halogen compound.