Titanium tetrachloride reacts with 2,6ƒ{bis[1ƒ{phenylimino)ethyl]pyridine, 1, and 2,6ƒ{bis[1ƒ{(2,6ƒ{diƒ{isopropylphenylimino) ethyl]pyridine, 2, giving the adducts of general formulae [Ti(1)Cl3]Cl, 3, and [Ti(2)Cl3]Cl, 6, the latter through the intermediacy of the covalently bonded [Ti(2)Cl4], 4. Heating 6 leads to reduction to the titanium(III) derivative [Ti(2)Cl3], 12, the latter characterized by Xƒ{ray diffraction methods. The reaction of [Ti(1)Cl3]Cl with a toluene solution of MAO proceeds with methylation at the orthoƒ{position of the pyridine ring to give the titanium(IV) derivative [Ti(C22H21N3)Cl3], 8. The reaction of [Ti(2)Cl3]Cl with MAO gives a mixture of products containing [Ti(2)Cl2(OAlCl3)], 9. Compound 9, which has been prepared independently by reacting 6 with AlOCl, is a rare case of a compound containing the ƒ{OAlCl3 moiety, as shown by a singleƒ{crystal Xƒ{ray diffraction study. From the tetrachlorides of zirconium and hafnium with 1 or 2, the corresponding adduc...
Bis(arylimino)pyridine Derivatives of Group 4 Metals: Preparation, Characterization and Activity in Ethylene Polymerization
CALDERAZZO, FAUSTO;PAMPALONI, GUIDO;
2005-01-01
Abstract
Titanium tetrachloride reacts with 2,6ƒ{bis[1ƒ{phenylimino)ethyl]pyridine, 1, and 2,6ƒ{bis[1ƒ{(2,6ƒ{diƒ{isopropylphenylimino) ethyl]pyridine, 2, giving the adducts of general formulae [Ti(1)Cl3]Cl, 3, and [Ti(2)Cl3]Cl, 6, the latter through the intermediacy of the covalently bonded [Ti(2)Cl4], 4. Heating 6 leads to reduction to the titanium(III) derivative [Ti(2)Cl3], 12, the latter characterized by Xƒ{ray diffraction methods. The reaction of [Ti(1)Cl3]Cl with a toluene solution of MAO proceeds with methylation at the orthoƒ{position of the pyridine ring to give the titanium(IV) derivative [Ti(C22H21N3)Cl3], 8. The reaction of [Ti(2)Cl3]Cl with MAO gives a mixture of products containing [Ti(2)Cl2(OAlCl3)], 9. Compound 9, which has been prepared independently by reacting 6 with AlOCl, is a rare case of a compound containing the ƒ{OAlCl3 moiety, as shown by a singleƒ{crystal Xƒ{ray diffraction study. From the tetrachlorides of zirconium and hafnium with 1 or 2, the corresponding adduc...I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
