Abstract
AbstractElectron spin resonance measurements on the systems TiCl4(Al(C2H5)Cl2)2, TiCl3‐CH3(Al(C2H5)Cl2)2, and TiCl4(Al(C2H5)2Cl)2 have revealed the formation of a particle with an unpaired electron, S, the concentration of which could be continuously followed with time. The kinetics of the former two systems are estimated and a mechanism for the reduction of the Ti(IV) compounds is proposed. It is shown that the concentration of the unpaired electrons equals the concentration of trivalent titanium in solution. The rate of polymerization of ethylene with the catalyst TiCl4 (Al(C2H5)2Cl)2 proves to be proportional to the concentrations of unpaired electrons. The structure of the particle carrying the unpaired electron is probably a complex consisting of TiCl3 and the dimer aluminum alkyl chloride.
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