Treatment of tris(norb0rnene)platinum with diphosphines and subsequent protonation affords a series of cationic complexes [Pt(C7HI1)(L2)]+ (L2 = peralkyldiphosphine) in which the norbornyl ligand binds to platinum via a-alkyl and P-C-H agostic interactions; the strength of the latter bond varies and has been characterised by n.m.r. and X-ray structure analysis.
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