Abstract Several methods for the preparation of organobromophosphanes from RPCl2 and R2PCl by halogen exchange are described. In case of aryl compounds optimal results are obtained by equilibration of the chlorophosphanes with PBr3 followed by distillation or crystallization, while gaseous HBr proved to be most efficient for converting the alkyl phosphanes. The isomeric composition of X [sbnd] C6H4PCl2 (X [dbnd] F, Cl, Br, CH3O,( ...
