Abstract
The cationic PtH complex, [ trans-PtH(PPh 3) 2(THF)], and OC(C≡CCMe 3) 2 undergo reaction in CH 2Cl 2 solution at −78 to 25°C to form, following a chloride quench of the reaction solution, a neutral Pt(II)(PPh 1) 2Cl complex containing a η 1-( exo-alkylidene)cyclobutenone ligand. This carbocyclic ligand is formed through addition of the PtH bond to one of the alkynyl substituents of the dialkynyl ketone followed by an overall Pt-mediated insertion of the second alkynyl substituent into the resulting PtC(alkenyl) bond. A proposed mechanism for this reaction is presented along with supporting experimental data. The X-ray structurwe of this new Pt complex, trans-Pt[CC-(CMe 3)C(O)CC(CMe 3)(H)](PPh 3) 2(Cl)·1/2CH 2Cl 2·H 2O, has been determined: space group, Pnma (No. 62); a = 18.829(1), b = 15.848(2), c = 17.019(2) A ̊ ; Z = 4 .
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