Synthesis of [Ethylene-1-(η<sup>5</sup>-4,5,6,7-tetrahydro-1-indenyl)-2- (η<sup>5</sup>-4‘,5‘,6‘,7‘-tetrahydro-2‘-indenyl)]titanium Dichloride, the Elusive Isomer of the Brintzinger-Type <i>a</i><i>nsa</i>-Titanocenes
作者:Patrick A. Kelly、Gideon O. Berger、Justin K. Wyatt、Michael H. Nantz
DOI:10.1021/jo034975o
日期:2003.10.1
We present a short synthesis of 1-(2-indenyl)-2-(3-indenyl)ethane (5) and a method for its conversion to the ansa-metallocene [ethylene(eta5-inden-1-yl)(eta5-inden-2-yl)]titanium dichloride (13). The synthetic strategy applied to prepare bisindene 5 relies on the efficient alkylation of 2-(phenylsulfonyl)indane followed by HMPA-assisted E1cB-elimination of phenylsulfinate. This tandem sequence circumvents