For 10 points, name this organophosphorus compound used in the Wittig reaction.
A hexamer of copper hydride bonded to this compound is known as Stryker's reagent. This compound is the most famous member of a class of compounds for which the Tolman cone angle was developed to describe. Two equivalents of this compound, a chlorine atom, and carbon monoxide bond to iridium in Vaska's complex. It can be used to reduce azides to amines via hydrolysis in one reaction and is used alongside diethyl azodicarboxylate to convert alcohols into various functional groups in another reaction. Those reactions are named for Staudinger and Mitsunobu. This compound is converted to its oxide via the elimination of an oxaphosphetane intermediate in a reaction where it reacts with a carbonyl to form a phosphonium ylide, which is then converted to an alkene. For 10 points, name this organophosphorus compound used in the Wittig reaction.
A hexamer of copper hydride bonded to this compound is known as Stryker's reagent.
triphenylphosphine [or PPh3; or triphenylphosphane; or TPP]