What is "chlorodiphenylphosphine"

Chlorodiphenylphosphine is an organophosphorus compound with the formula (CH)PCl, abbreviated PhPCl. It is a colourless oily liquid with a pungent odor that is often described as being garlic-like and detectable even in the ppb range. It is useful reagent for introducing the PhP group into molecules, which includes many ligands. Like other halophosphines, PhPCl is reactive with many nucleophiles such as water and easily oxidized even by air.