ChemInform Abstract: Oxygen‐Selenium Exchange Using Phenylselenophosphonic Dichloride (PhP(Se)Cl2): Conversion of C=O into C=Se.

Abstract Treatment of the carboxamides (I), the aldehydes (IV), and the 1,2‐dithiolone (VI) with phenylselenophosphonic dichloride (II) results in the formation of the corresponding seleno derivatives (III), (V), and (VII).