internal Zr+...(pyrrolyl)B- ionpairinteraction with a Zr...pyrrolyl-alphacarbon separation of 2.723(3) A (determined by X-ray diffraction). From the dynamic NMR spectra of 15 the bond strength of the internal ionpairinteraction was estimated to be deltaGdiss (223 K) approximately = to15 kcalmol(-1). Treatment of dimethylzirconocene (16) with 2 yields the metallocene borate salt [Cp2ZrCH3]+[(C4H4N)B(CH3)(C6F5)2]-
用N-吡咯烷基锂处理(C6F5)2BF x OEt2(3)配合物,得到双(五氟苯基)(N-吡咯基)硼烷(2),一种强有机金属路易斯酸,其特征在于X射线衍射(BN键)长度:1.401(5)A)。它在晶体中显示出柱状上部结构,并包含吡咯基单元的pi堆栈。化合物2易于从各种4号烷基茂金属型络合物中提取烷基阴离子,并导致各个茂金属离子或离子对的干净形成。例如,用2处理Cp3ZrCH3(9)可转移甲基阴离子,得到离子对[Cp3Zr] + [(C4H4N)B(CH3)(C6F5)2]-(12)。X射线晶体结构分析显示12与锆和吡咯基β-碳(2.641(2)A)紧密接触。硼烷2加到(丁二烯)锆茂(13)中以产生甜菜碱系统[Cp2Zr] + [(C4H6)B-(NC4H4)(C6F)2]-(15)。配合物15在金属环框架内包含一个扭曲的eta3-烯丙基部分,并且具有内部Zr + ...(吡咯基)B-离子对相互作用,且Zr