摘要:
A simple and convenient route for synthesizing organotitanium (IV) complexes with a general formula CP2Ti(SeR)(2) or CP2TiCl(SeR) has been developed. This synthetic route includes reduction Of Cp2TiCl2 with Mg and an in situ treatment of the intermediate 'Cp2Ti' with diselenides RSeSeR. Interestingly, while the route involving reaction Of Cp2TiCl2, Mg and RSeSeR in a molar ratio of 1:1:1 produced CP2Ti(SeR)2, (1-5, R=alpha-C10H7, o-MeC6H4, m-MeC6H4, P-ClC6H4, p-BrC6H4) in 91-97% yields, the route involving reaction of Cp2TiCI2, Mg and RSeSeR in a molar ratio of 1: 0.5: 0.5 afforded Cp2TiCl(SeR) (6-7, R=p-ClC6H4, p-BrC6H4) in 70% and 92% yields, respectively. 1-7 are new and have been characterized by elemental analysis and spectroscopy, as well as by X-ray diffraction analysis for 6 and 7. A possible pathway for production of these two types of organotitanium (IV) complexes, mainly depending upon the molar ratio of the starting materials, are briefly discussed. (C) 2003 Elsevier B.V. All rights reserved.