T 5-pentamethylcyclopentadienyl titanium

Dicarbonylbis(Ti -pentamethylcyclopentadienyl)titanium is moderately stable in air, but it is best handled and stored under an inert atmosphere. It is extremely soluble in both aliphatic and aromatic solvents. The H NMR spectrum (C Ds) exhibits a singlet at 8 1.67 ppm (external TMS). The IR spectrum displays two metal carbonyl stretching vibrations at 1940 and 1858 cm (hexane). The mass spectrum shows a parent ion at m/e 374. 

Dichlorobis(Ti -pentamethylcyclopentadienyl)hafnium is a yellow air-stable solid that is soluble in both aromatic and chlorinated solvents. The H NMR spectrum (CDClj) exhibits a singlet at 8 2.05 ppm. 

A 100-mL three-necked round-bottomed flask is fitted with a reflux condenser and gas inlet and outlet tubes. Approximately 60 mL of THF is added to thei flask together with freshly cut potassium metal (1.11 g, 28.4 mmol), anhydrous MgClj (1.90 g, 20.0 mmol), and KI (0.50 g, 3.0 mmol). 

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