Process for alkylating elemental phosphorus

US6011172A · kind A · utility

Assignee

• Clariant Corporation · DE

Inventors

• Norbert Weferling · Hürth, DE
• Othmar Stelzer · Wuppertal, DE
• Gunter Kolbe · Kerpen, DE

Key dates

• Filing date: Nov 24, 1998
• Grant date: Jan 4, 2000
• Expiry date: Nov 24, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/48
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing alkali metal salts and/or alkaline earth metal salts of alkylphosphonous acids and dialkylphosphinic acids from elemental yellow phosphorus and alkyl halides, which comprises carrying out the reaction in the presence of aqueous alkali metal hydroxide or alkaline earth metal hydroxide or mixtures thereof. The invention likewise relates to the use of the compounds prepared by the process according to the invention for preparing flame retardants, extraction media and plant protection agents.