Bisphosphinic acid anhydrides and process for their preparation

US4196141A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans-Jerg Kleiner · Kronberg, DE
• Walter Dursch · Königstein, DE
• Fritz Linke · Königstein, DE

Key dates

• Filing date: Feb 7, 1979
• Grant date: Apr 1, 1980
• Expiry date: Feb 7, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/305
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Bisphosphinic acid anhydrides of the formula ##STR1## in which R is a saturated open chain or cyclic alkylene radical, an arylene or aralkylene radical, and R.sup.1 and R.sup.2, which may be identical or different, represent optionally halogen substituted alkyl, aryl or aralkyl radicals, and m represents an integer .gtoreq.1, preferably .gtoreq.2 and a process for their preparation which comprises reacting bisphosphinic acid derivatives of the formula ##STR2## in which R.sup.3 and R.sup.4, are hydrogen, monovalent cations, the ammonium group or optionally halogen-substituted alkyl groups, with inorganic acid chlorides and/or with phosgene and/or with oxalyl chloride and/or with the corresponding bromine compounds in a molar ratio of about 1:1 at a temperature up to 250.degree. C.