Titanatrane CpTi(OCH(CH3)CH2)3N (3) was prepared by the reaction of CpTiCl3 with N(CH2CH(CH3)OH)3 in the presence of triethylamine. The reaction of CpTi(OMe)3 (8) with N(CH2CH2OH)2(CH2CHPhOH), erythro-N(CH2CH2OH)2(CHPhCHPhOH), and N(CH2CH2OH)2(CH2CPh2OH) gave cyclopentadienyltitanatranes 12–14. Compound 8 reacts with threo-N(CH2CH2OH)2(CHPhCHPhOH) to give a mixture of threo-CpTi(OCH2CH2)2(OCHPhCHPh)N and threo-MeOTi(OCH2CH2)2(OCHPhCHPh)N. Slow hydrolysis of the latter product gave threo-[Ti3O(OMe)(OCH2CH2)2− (OCHPhCHPh)N} 3]2, which was studied by X-ray diffraction analysis. The crystal structures of 3 and 12 were also determined by X-ray diffraction analysis. The titanium coordination polyhedron in these complexes is a distorted trigonal bipyramid in which the equatorial positions are occupied by three oxygen atoms and the axial positions contain the N atom and the Cp group. The titanium—nitrogen distances (2.313(2), 2.291(2) Å in two independent molecules of 3 and 2.271(2) Å in compound 12) confirm the presence of Ti←N transannular interaction.
合成了
钛酸胺 CPTi(OCH(
CH3)
CH2)3N (3),反应物为 CPTiCl3 和 N( CH( )OH)3,在
三乙胺存在下进行反应。CPTi(OMe)3 (8) 与 N( OH)2( CHPhOH)、erythro-N( OH)2(CHPhCHPhOH) 和 N( OH)2( CPh2OH) 反应,得到
环戊二烯基
钛酸胺 12–14。化合物 8 与 threo-N( OH)2(CHPhCHPhOH) 反应生成 threo-CPTi(O )2(OCHPhCHPh)N 和 threo-MeOTi(O )2(OCHPhCHPh)N 的混合物。后者产品的缓慢
水解得到 threo-[Ti3O(OMe)(O )2−(OCHPhCHPh)N} 3]2,采用 X 射线衍射分析进行研究。化合物 3 和 12 的晶体结构也通过 X 射线衍射分析进行测定。这些配合物中
钛的配位多面体为扭曲的三角双锥,赤道位置被三个氧原子占据,轴向位置则包含了氮原子和 CP 基团。
钛—氮距离(在两个独立的 3 分子中分别为 2.313(2)、2.291(2) Å,化合物 12 中为 2.271(2) Å)证实了存在 Ti←N 跨环相互作用。