Titanium and zirconium neopentyl chloro complexes, MNpxCl4−x (x = 1−4)
摘要:
The comproportionation reaction between the titanium and zirconium homoleptic neopentyl complexes, TiNp4 and ZrNp4 (Np = 2,2'dimethylpropyl; CH2CMe3) and the metal tetrachlorides, TiCl4 and ZrCl4 provides a facile route to all of the titanium and zirconium neopentyl chloro complexes, MNpxCl4-x (x = 1,2,3). All the complexes described are moisture-sensitive, and in the case of the titanium complexes, light-sensitive also. The stability of the complexes at room temperature has also been estimated. The neopentyl chloro complexes, and the isotopically labelled species (where (Np-d) = CH(D)CMe3), have been spectroscopically characterised, the H-1 NMR resonance of the CH2 protons displays an increasing shift to high frequency in the series MNp4, MNp3Cl, MNp2Cl2, MNpCl3. A modified synthesis of Me3CCHDCl from Me3CCHDOH is reported. (C) 1997 Elsevier Science S.A.