| abstract |
A process is specified for the preparation of tertiary phosphines of the formula R'PR2 or R2P-[CH2]3-PR2 in which R is an aryl, pyridyl or arylsulfonic acid group and R' is an aryl, pyridyl, arylsulfonic acid or n-butyl group, which comprises reacting phosphines of the formula HnPR''3-n or H2P-[CH2]3-PH2 in which R'' is hydrogen or an n-butyl, aryl or pyridyl group and n is 1 or 2 with a halogen compound of the formula X-R, in which R has the abovementioned meaning and X is fluorine, chlorine or bromine, in the presence of powdered potassium hydroxide and dimethyl sulfoxide and/or dimethoxyethane at temperatures between 0 and 100 DEG C., at least 1 mol of potassium hydroxide being used per mole of halogen compound. |