活性白土触媒を用いたα-メチルスチレンの二重化反応<ミニノート>

概要

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Dimerization of α-methylstyrene to produce 2,4-diphenyl-4-methyl-1-pentene (1-PT) was carried out over an activated earth catalyst in presence of diethylcarbonate as a co-catalyst. The co-catalyst suppressed the formation of the undesirable products, 2,4-diphenyl-4-methyl-2-pentene (2-PT), 1,1,3-trimethyl-3-phenylindan (IND), and trimers (Trimers), with a decrease of the dimerization rate. From the above results, it was suggested that the co-catalyst prevents the adsorption of 1-PT on active sites of the catalyst suface. The selectivities of 2-PT and IND decrased as the reaction temperature decreased, because the activation energy of 1-PT formation was lower than those of 2-PT and IND formations. On the other hand, low reaction temperature favored the formation of Trimers. It seems that the intermediates are strongly adsorbed on the active sites and react easily with AMS at the lower reaction temperature.
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