Enantiomerically pure P-chiral phosphinoselenoic chlorides: inversion of configuration at the P-chirogenic center in the synthesis and reaction of these substances.

Reaction of diastereomerically pure phosphinoselenoic acid salts with oxalyl chloride leads to enantiomerically pure P-chiral phosphinoselenoic chlorides with inversion of configuration at phosphorus; one of these chlorides is converted to a phosphinoselenothioic acid salt with a high degree of enantioselectivity.