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The preferred catalytic cycle occurring in the conversion of isobutene and 2-butene to propylene and pentenes over WH ₃ /Al ₂ O ₃ has been investigated via an energetic analysis of the metallacyclobutanes formed upon 2 + 2 butene cycloaddition with alumina supported tungsten alkylidenes.
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Motta et al. (2016) studied this question.
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