Stable cyclopropenylvinyl ligands via insertion into a transient cyclopropenyl metal bond
Lachlan J Watson1, Anthony F Hill1
1Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory, ACT 2601, Australia. a.hill@anu.edu.au.
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 (RCCCO2Me, R = H, CO2Me) to afford unusually stable cyclopropenylvinyls, implicating the intermediacy of σ-cyclopropenyl isomers. In contrast, treatment of [RhCl{py(NHPBu2)2-2,6}] with the same reagent instead results in double functionalisation (SEAr) at the pincer backbone.
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