A photooxidation approach to the conversion of phosphines into the corresponding phosphine
oxides is reported. By taking advantage of O2 in the air as an oxidant and oxygen source, phosphine oxides were obtained efficiently
in moderate to excellent yields. A four-coordinated organoboron compound was used
as the photocatalyst to activate O2 to its singlet state. This photooxidation method features mild reaction conditions,
broad functional-group tolerance, and a wide substrate scope.
Key words
photocatalysis - oxidation - phosphines - phosphine oxides - boron catalysis