The title compound, [Ti(C14H15)(2)Cl-2], belongs to a class of complexes that are potentially active as pre-catalysts in the stereospecific polymerization of olefins. In the crystal structure, molecules lie on C-2 axes with pseudo-tetrahedral coordination around the Ti atoms. Conformational features of the compound are discussed, in conjunction with calculations that demonstrate the existence of other energetically favorable conformations in addition to that found in the reported crystal structure.
Doerrer, Linda H.; Green, Malcolm L. H.; Haeussinger, Daniel, Journal of the Chemical Society, Dalton Transactions, 1999, # 13, p. 2111 - 2118
作者:Doerrer, Linda H.、Green, Malcolm L. H.、Haeussinger, Daniel、Sassmannshausen, Joerg
DOI:——
日期:——
Control of <i>ansa</i>-Zirconocene Stereochemistry by Reversible Exchange of Cyclopentadienyl and Chloride Ligands
作者:Richard M. Buck、Nawaporn Vinayavekhin、Richard F. Jordan
DOI:10.1021/ja0681523
日期:2007.3.1
to pure rac. The isomerization requires Cp−enantioface exchange and is catalyzed by chloride ion, which reversibly displaces Cp- from Me2Si(3-R-C5H3)2ZrMe3SiN(CH2)3NSiMe3}. Kinetic analyses for selected complexes showed first-order dependence of the isomerization rate on both metallocene and chloride concentrations. Reversible Cp-/Cl- exchange is also facile for ansa-bis-Cp}ZrCl2 and nonbridged Cp2ZrCl2