Electron-deficient cyclopropenium cations as Lewis acids in FLP chemistry
作者:Dipendu Mandal、Zheng-Wang Qu、Stefan Grimme、Douglas W. Stephan
DOI:10.1039/d3cc02684a
日期:——
substituents are Lewisacidic despite the presence of π-electrons. The chloride and electron affinities are examined computationally and experimentally, respectively. These cations form classic Lewis acid-base adducts with PPh3, while sterically demanding phosphines yield frustratedLewispairs (FLPs) which participate in FLP additions. Depending on the basicity of the phosphine used, addition to alkynes or alkyne
Metallocene-catalyzed olefin polymerizations using triphenylcyclopropenium tetrakis(pentafluorophenyl)borate as the activator
作者:Huiying Li、Douglas C Neckers
DOI:10.1139/v03-047
日期:2003.6.1
enyl)borate activates bis(cyclopentadienyl)dimethyl titanium resulting in a highly reactive initiating system for the polymerization of styrene. In contrast to triphenylmethyl tetrakis(pentafluorophenyl)borate which is quite active in the absence of the metallocene, TPCP borate shows no activity for styrene polymerization in the absence of bis(cyclopentadienyl)dimethyl titanium. TPCP is the most efficient