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The dimerization of -methylstyrene [ (1 -methylethenyl)benzene] with acidic ion-exchange resins such as Amberlyst 15, "monodisperse" K 2661, Lewasorb AC 10 FT, Nation NR 50, various acidtreated clays, etc., as catalysts, in a variety of solvents was studied in 0.05-and 0.10-m-i.d. mechanically agitated reactors in the temperature range 60-160 °C. In cumene and anisóle media, the dimerization was found to be kinetically controlled and followed first-order kinetics with respect to a-methylstyrene. In phenol and substituted phenol media, the dimerization was also found to be kinetically controlled, but the rates for specified catalyst loadings were higher by a factor of 2-3 compared to that in cumene medium. Some experiments were also carried out with aqueous 85% formic acid, aqueous 80% chloroacetic acid, aqueous 50% p-toluenesulfonic acid, etc., to explore their utility for obtaining dimers. The selectivity with respect to the individual unsaturated dimers (2,4-diphenyl-4-

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