Abstract
It is shown that in oligomerization of ethylene by the systems TiCl 4C 2H 5AlCl 2 and Ti(nOC 4H 9) 4C 2H 5AlCl 2 in ethyl chloride at −20°, extensive chain transfer to monomer results in formation of fifty to two hundred oligomer chains per atom of titanium or ten to fifty chains per atom of aluminium. It is shown by infrared and PMR spectroscopy, ozonization and bromination that the oligomers prepared in ethyl chloride have a low degree of unsaturation not exceeding 10 mole % of double bonds calculated on the total quantity of oligomer, and a high degree of branching, varying from three hundred to one thousand CH 3 groups per thousand CH 2 groups. It is suggested that the high degree of branching of the ethylene oligomers is a result of isomerization of monomer units during the course of chain propagation, and that the low unsaturation is due to termination with cyclization of the chain. A number of facts supporting these suggestions are presented.
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