Add time:07/30/2019         Source:sciencedirect.com

Phenylation of dichloro-μ4-norbornadienepalladium either with diphenylmercury or, more conveniently, with sodium tetraphenylborate gave di-μ-chlorobis(2:5.6-μ-3-endo-phenylnorbornen-2-yl-endo-palladium) (IV). This reaction provides the first definitive evidence for a cis addition of Pd-R to a coordinated double bond. By contrast phenylation of dichloro-μ4-norbornadieneplatinum gave first [Pt(Ph)(Cl)(nor-C7H8)] and then [PtPh2(nor-C7H8)] and no phenylation of the norbornadiene could be induced. Complex (IV) underwent a reversible ring-closure to give the nortricyclenyl complex (VI), [PdCl(py)2(C7H8)], on reaction with pyridine. In the solid state (IV) is bonded in a σ,π-form but the homoallylic form for (IV) and for related complexes is probably easily accessible.

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