Abstract
Abstract The reaction of isoprene by the catalyst systems composed of cobalt(III) or iron(III) ace-tylacetonate, an electron donor, and triethylaluminum was studied. It was found that isoprene is selectively dimerized to form a mixture of 1,5- and 2,5-dimethyl-1,5-cyclooctadiene by the catalyst prepared by the reaction of iron(III) acetylacetonate, 2,2′-dipyridyl, and triethylaluminum. The intermediate complex of the reaction was then examined by studying the effects of the molar ratio of the catalyst components on the reaction or by the measurement of the electronic absorption spectra of the reaction solution. The reaction of butadiene with the catalyst systems described above was also carried out and compared with that of isoprene.
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