Phosphine oxides are phosphorus compounds with the formula OPX
3. When X =
alkyl or
aryl, these are organophosphine oxides.
Triphenylphosphine oxide is an example. An inorganic phosphine oxide is
phosphoryl chloride (POCl
3). Such compounds are thermally stable, decomposing only above 450 °C.
Phosphoryl refers to a functional group drawn with a phosphorus-oxygen double bond.