C8 and C12 sp Carbon Chains That Span Two Platinum Atoms: The First Structurally Characterized 1,3,5,7,9,11-Hexayne
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Reaction sequences involving trans-(p-tol)-(Ar3P)2PtCl (Ar = Ph, p-tol), HCCCCH, HCCSiEt3, and oxidative CH/HC cross- or homocoupling (O2, cat. CuCl/TMEDA) give the Cx complexes trans,trans-(p-tol)(Ar3P)2Pt(CC) nPt(PAr3)2(p-tol) (n = 4, 6), which have been characterized by crystallography and by IR, NMR, and UV-visible spectroscopy.