Treatment of tris(norbornene)platinum with diphosphines and subsequent protonation affords a series of cationic complexes [Pt(C7H11)(L2)]+(L2= peralkyldiphosphine) in which the norbornyl ligand binds to platinum viaσ-alkyl and β-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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Carr et al. (1988) studied this question.