Abstract
The kneaded mixture composed of a Friedel-Crafts catalyst and a metal salt has very strong acidity comparable to those of superacids, and shows a remarkable catalytic activity for alkane isomerization at room temperature. The synergism was examined in detail, and Cu(AlCl 4) 2 and Cu(GaCl 4) 2, novel ‘solid superacid’ substances, were isolated as the active species formed in AlCl 3-CuCl 2 and GaCl 3-CuCl 2 (or -CuSO 4) kneaded mixture respectively. The mechanism of pentane isomerization with Cu(AlCl 4) 2, including the X-ray crystal structure of this compound, is described. Cu(AlCl 4) 2 is also effective for benzene polymerization.
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