SETT ATT FRAMSTELLA TERTIERA FOSFINOXIDER GENOM ATT FRAN DIHYDROXIMETYLFOSFONIUMHALOGENIDER I SMELT TILLSTAND AVSPALTA FORMALDEHYD OCH HALOGENVETE

摘要

Production of tertiary phosphine oxides of the general formula (I): (I) in which the substituents R1 and R2, being identical or different, each stand for an alkyl, alkenyl, alkinyl, cycloalkyl, aralkyl or aryl radical having from 1 to 18 carbon atoms. The phosphine oxides are made by splitting off formaldehyde and hydrogen halide at temperatures within the range about 150 DEG and 350 DEG C, in the presence of hydrogen halide, from a molten compound of the general formula (II): (II) in which R1 and R2 have the meanings given above and X stands for halogen; separating the formaldehyde and hydrogen split off from the reaction mixture, and treating the resulting crude product so as to separate the compound of general formula (I) therefrom.