Synthesis and Chemistry of Titanacyclopentane and Titanacyclopropane Rings Supported by Aryloxide Ligation

摘要

Treatment of the tintancayclopentadiene compound [Ti(OC_6H_3Ph_2-2,6)_2(C_4Et_4)](3) (OC_6H_3Ph_2-2,6=2, 6- diphenylphenoxide) with olefins leads to the formation of a variety of stable titanacyclopentane derivatives along with one equivalent of substituted 1, 3-cyclohexadiene. The structural and spectroscopic properties of the ethylene product [Ti(OC_6H_3Ph_2-2,6)_2(CH_2)_4] (4) show a ground state titanacyclopentane structure, but facile fragmentation on the NMR time scale to form a bis(ethylene) complex has been detected.