Difluorochloracetyl, dichloracetyl and trichloracetyl chloride preparation

US5919341A · kind A · utility

Assignee

• SOLVAY FLUOR und DERIVATE GmbH · DE

Inventors

• Max Braun · Großburgwedel, DE
• Werner Rudolph · Hannover, DE
• Kerstin Eichholz · Langenhagen, DE

Key dates

• Filing date: Dec 23, 1997
• Grant date: Jul 6, 1999
• Expiry date: Dec 23, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/58
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing chlorodifluoroacetyl chloride from 1,1-difluoro-2,2-dichloroethylene and dichloroacetyl chloride from trichloroethylene or 1,1,2,2-tetrachloroethane, in which the starting compounds are continuously reacted in the gaseous phase with oxygen to obtain a photochemical oxidation reaction, chlorine being added as a sensitizer, the reaction mixture being irradiated with light having a wavelength .lambda..gtoreq.280 nm, the reaction preferably being carried out unpressurized. Particularly high yields with height selectivity are achieved by using doped high pressure mercury vapor lamps to irradiate the reaction mixture.