Reactivity of IrCl(PPh<sub>3</sub>)<sub>3</sub> with diphenylacetylene — A direct route to 1-iridaindene

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<jats:p> The 1-iridaindene complex, Ir[C<jats:sub>8</jats:sub>H<jats:sub>5</jats:sub>(Ph-2)]Cl(PPh<jats:sub>3</jats:sub>)<jats:sub>2</jats:sub> (2), has been prepared from the reaction of IrCl(PPh<jats:sub>3</jats:sub>)<jats:sub>3</jats:sub> with PhC≡CPh by a novel direct cycloiridation reaction. A plausible mechanistic pathway has been suggested involving π-coordination assisted ortho- C–H activation and subsequent alkyne hydroiridation reaction to provide the five-member iridacycle.Key words: iridium, diphenylacetylene, C–H activation, cyclometallation, metallacycle. </jats:p>

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