[TiCl3(tmeda)(thf)] produced a titanium methylene complex. The X-ray diffraction study displayed a dinuclear methylene structure [TiCl(tmeda)]2(μ-CH2)(μ-Cl)2. Treatment of an ester with the titanium methylene complex resulted in methylenation of the ester carbonyl to form a vinyl ether. The titanium methylene complex also reacted with a terminal olefin, resulting in olefin-metathesis and olefin-homologation. Cyclopropanation
Some coordination compounds of titanium and zirconium halides with tertiary phosphines and related ligands
作者:D. Gordon、M.G.H. Wallbridge
DOI:10.1016/s0020-1693(00)82221-5
日期:1986.1
reported including, (PhO)2TiCl2·2L (or L′) (L = PMe3, PPh3; L′ = dmpe, dbpe, tmed); MCl4·L (M = Ti, Zr; L = dbpe): TiCl3·L (L = dmpe, dbpe, tmed): TiCl3·tmed·THF and ZrCl4·1.5tmed. The solution properties of some of the TiCl4 adducts are discussed, as deduced from 31P NMR spectra.
A monomeric titanium(III) complex, TiCl3(tmeda)(thf) (1), has been prepared by a reaction of TiCl4 with TMEDA, Zn, and a catalytic amount of PbCl2 in an almost quantitative yield. The solid state structure of 1 is revealed by X-ray crystallographic analysis. The complex 1 couples aromatic aldehydes under mild conditions to give 1, 2-diols in good to excellent yields with high dl-selectivities.