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
我们介绍1-(2-茚基)-2-(3-茚基)乙烷(5)的简短合成及其将其转化为ansa-茂金属[乙烯(eta5-inden-1-yl)(eta5-茚满-2-基)]二氯化钛(13)。用于制备双茚5的合成策略依赖于2-(苯磺酰基)茚满的有效烷基化,然后通过HMPA辅助的E1cB消除苯亚磺酸盐。该串联序列绕开了进行C(1)-烷基化的茚的倾向,并使得能够获得C(2)-取代的茚基。标题ansa-titanocene(4)合成中的关键步骤具有以前从未报道的平衡步骤,可生成5的双(茚阴离子)。与TiCl4。(THF)2络合,然后将金属茂氢化,得到ansa-钛茂4。