Highly regioselective simultaneous introduction of phosphino and seleno groups into unsaturated bonds by the novel combination of (Ph2P)2 and (PhSe)2 upon photoirradiation.

A novel combination of tetraphenyldiphosphine and diphenyl diselenide under photoirradiation conditions attains simultaneous introduction of diphenylphosphino and phenylseleno groups into carbon-carbon unsaturated bonds such as terminal alkynes or allenes, regioselectively.