Study on the Reaction Mechanism of the Reaction of Isolable Hydrido-chalcogenolato Platinum Complexes with Alkynes

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The hydroselenation of hydrido-selenolato Pt(II) complexes with alkynes was studied. On the basis of the results employing the complexes having a 9-triptycyl group on the selenium and triphenylphosphine or 1,2-(diphenylphosphino)ethane as the phosphorus ligand, it was revealed that the dissociation of a phosphorus ligand is essential in the initial stage. It is also discovered that the complex having triphenyl phosphite ligands reacts with phenylacetylene to yield the corresponding selenaplatinacycle and styrene.