Process for the preparation of ethane-1,2-diphosphinic acid diesters

US4001352A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans-Jerg Kleiner · Kronberg, DE
• Walter Rupp

Key dates

• Filing date: Apr 25, 1975
• Grant date: Jan 4, 1977
• Expiry date: Apr 25, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/3235
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of ethane-1,2,-diphosphinic acid diesters of the formula ##STR1## where R.sub.1 represents alkyl, phenyl and/or phenalkyl groups having from 1 to 18 carbon atoms and R.sub.2 alkyl groups having from 1 to 18 carbon atoms, which may be optionally substituted by halogen atoms, which comprises reacting phosphonous acid esters of the formula ##STR2## where R.sub.1 and R.sub.2 are as define above, with acetylene in the presence of catalytic amounts of radical-forming agents and/or with UV irradiation.