Chelating P,N versus P,P Ligands: Differing Reactivity of Donor-Stabilized Pt(η2-PhC⋮CPh) Complexes Toward Diphenylacetylene
Organometallics2002Vol. 21(6), pp. 1118–1123
Citations Over TimeTop 15% of 2002 papers
Abstract
The thermal activation of the η2-diphenylacetylene complex (PN)Pt(η2-PhC⋮CPh) (1) (PN = (diisopropylphosphinodimethylamino)ethane leads to the formation of the platinacyclopenta-2,4-diene compound (PN)Pt(CPh)4 (3), which can be quantitatively obtained by reaction of 1 with 1 equiv of diphenylacetylene. Two transient intermediates are observed by 31P NMR spectroscopy during the course of the latter reaction. These species were independently synthesized and characterized. Hexaphenylbenzene is catalytically generated by reaction of 1 in the presence of excess diphenylacetylene. In contrast, no reaction of diphenylacetylene with (dippe)Pt(η2-PhC⋮CPh) (2) (dippe = bis(diisopropylphosphino)ethane) was observed.
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