Evonik Degussa Gmbh

Evonik Oxeno Gmbh

Bjoern Wechsler

Dirk Fridag

Burkard Kreidler

Bernhard Schemmer

Robert Franke

Andrea Christiansen

Doris Neumann

The invention relates to a method for producing 6-chlorodibenzo[d,f][1,3,2]-dioxaphosphepin (formula 1), comprising the following steps: a) addition of 2,2'-dihydroxybiphenyl, which is suspended in an inert solvant. into a reactor to an excess of phosphorous trichloride under inert gas and stirring; b) discharge and neutralization of the resulting gases from the reaction mixture; c) separation of the excess phosphorous trichloride and the solvant; d) obtention of 6-chlorodibenzo[d,f][1,3,2]-dioxaphosphepin.

Method for producing 6-chlorodibenzo[D,F] [1,3,2] dioxaphosphepin

The invention relates to a process for producing 6,6'-[(3,3&#x2032;-di-tert-butyl-5,5&#x2032;-dimethoxy-1,1&#x2032;-biphenyl-2,2&#x2032;diyl)bis(oxy)]bis(dibenzo[d,f][1,3,2]dioxaphosphepine), abbreviated to biphephos (see formula 1), with low chlorine content. 

Method for the preparation of biphephos

The invention relates to a method for producing 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepin (formula 1), comprising the following steps: a) addition of 2,2'-dihydroxybiphenyl, which is suspended in an inert solvant. into a reactor to an excess of phosphorous trichloride under inert gas and stirring; b) discharge and neutralization of the resulting gases from the reaction mixture; c) separation of the excess phosphorous trichloride and the solvant; d) obtention of 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepin.

Method for producing 6-chlorodibenzo[d,f] [1,3,2]-dioxaphosphepin

The invention relates to a method for producing 6-chlorodibenzo[d,f][1,3,2]-dioxaphosphepin (formula 1), comprising the following steps: a) addition of liquid 2,2'-dihydroxybiphenyl into a reactor to an excess of phosphorous trichloride under inert gas and stirring; b) discharge and neutralization of the resulting gases from the reaction mixture; c) separation of the excess phosphorous trichloride; d) obtention of 6-chlorodibenzo[d,f][1,3,2]-dioxaphosphepin.

Growing community of inventors

Borken, Germany

Bjoern Wechsler