Stable cyclopropenylvinyl ligands via insertion into a transient cyclopropenyl metal bond†
Lachlan J.
Watson 
a
and
Anthony F.
Hill
*a
a
and
Anthony F.
Hill
*a
Abstract
Treatment of the rhodium pincer complexes [RhCl(RPm)] (RPm = N,N′-bis(di-R-phosphinomethyl)perimidinylidene, R = Ph, Cy) with triphenylcyclopropenium hexafluorophosphate affords rhodacyclobutadiene complexes. These in turn react with activated alkynes (RC![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CCO2Me, R = H, CO2Me) to afford unusually stable cyclopropenylvinyls, implicating the intermediacy of σ-cyclopropenyl isomers. In contrast, treatment of [RhCl{py(NHPtBu2)2-2,6}] with the same reagent instead results in double functionalisation (SEAr) at the pincer backbone.
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