This part of the title specifies the type of compounds being synthesized. Phosphine oxides are compounds that contain a phosphorus atom bonded to an oxygen atom. "Exocyclic" suggests that these compounds have their functional groups located outside of a ring structure, in contrast to "endocyclic" functional groups, which would be within a ring.
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Phosphine oxide, (2,2-diphenylethyl)diphenyl-
