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

摘要

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.

主权项

1. A process for preparing 6-chlorodibenzo[d,f]-[1,3,2]dioxaphosphepin, which comprises:
a) adding a suspension of 2,2′-dihydroxybiphenyl in an inert solvent to an excess of phosphorus trichloride under inert gas in a reactor and stirring, to obtain a reaction mixture and resulting gas; b) discharging and neutralizing the at least one resulting gas from the reaction mixture; c) removing excess phosphorus trichloride and also the solvent; and d) isolating 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepin.