Synthesis of new titanatranes containing organic substituents in the atrane fragmentстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Titanatrane CpTi(OCH(CH3)CH2)(3)N (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) angstrom in two independent molecules of 3 and 2.271(2) angstrom in compound 12) confirm the presence of Ti <- N transannular interaction.