Abstract
Abstract : Bis-cyclopentadienyl titanium dichloride (I) was allowed to react with about a thousandfold excess of several aluminum alkyls in benzene solution and the electron spin resonance (e.s.r.) spectra of these solutions were observed at 3.2 cm. wave length and at 20C. The reactions with several aluminum alkyls were investigated: Me3Al, Et3Al, iso-Bu3Al, Et2AlCl, and EtAlCl2. The nature of the e.s.r. spectrum was found to depend upon the aluminum alkyl which was allowed to react with I. Furthermore, the e.s.r. spectrum of the EtAlCl2 system was found to change with time. The product of the reaction between Et3Al and I was shown to be the compound Cp2TiCl2AlEt2, which has one unpaired electron. The final products of the reactions based upon Et2AlCl and EtAlCl2 are most probably the compounds Cp2TiCl2AlEtCl and Cp2TiCl2AlCl2, respectively. The spectra indicate that more than one paramagnetic species is present. The compositions and structures of the products of systems based upon Me3Al and isoBu3Al are not known, but the formulations Cp2TiCl2AlR2 may well apply. (Extracted)
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