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ortho-Lithiation of triphenylphosphonio-methylide and, also, triphenylphosphine oxide

Treating Ph3P+C-H2 with RLi (R = Me, Bu) gave mainly RPh2P+C-H2 via extensive ligand exchange whereas R1Li (R1 = MeEtCH, Me3C) reacts to give o-lithiated Ph2(o-LiC6H4)P+C-H2. Ph3PO is also o-lithiated by PhLi or Me3CLi to give Ph2(o-LiC6H4)P+O-. [on SciFinder (R)]

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