Bis‐Ylide Ligands from Acyclic Proximal Diphosphonium Precursors
作者: Carine MaalikiMohammed AbdalilahCécile BarthesCarine DuhayonYves CanacRemi Chauvin
作者单位: 1CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, 31077 Toulouse, France, Fax: +33‐5‐61553003, http://www.lcc‐
2 Université de Toulouse, UPS, INP, LCC, 31077 Toulouse, France
刊名: European Journal of Inorganic Chemistry, 2012, Vol.2012 (25), pp.4057-4064
来源数据库: Wiley Journal
DOI: 10.1002/ejic.201200407
关键词: YlidesYlide ligandsPhosphorusRhodiumElectrostatic interactions
原始语种摘要: Abstract(#br)1,2‐ or 1,3‐Phenylene‐diphosphonium bis‐ylides have been prepared and their stabilities compared by analysis of the effects of the substitution pattern of the phenylene bridge and the steric hindrance of the P ‐alkyl substituents in the diphosphonium precursors RPh2P+(C6H4)+PPh2R′ (R,R′ = Me, Et). In the o ‐phenylene series, the vicinity of the phosphorus centers allows the distal P+/C charge separation of the mono‐ylide intermediate to be canceled by the formation of a cyclic ylidophosphorane. The ring strain in the latter was released through phenylene–P(σ5) bond cleavage to afford relaxed diphosphonium bis‐ylides, which were isolated as carbodiphosphorane, or protonated in...
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