T. Yamanaka, F. Nakata
1977
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Journal
Bulletin of the Chemical Society of Japan
Abstract
The kinetics in a liquid-phase isopropylation of m-cresol (I) with 9–25 kg/cm2 of propylene (VI) was studied at 240–280 °C over catalysts prepared from FeSO4 and γ-Al2O3. The rates of the formation of thymol (II) and 4-isopropyl-5-methylphenol (III) and the subsequent isopropylations of II and III were fitted to an irreversible, firstorder rate equation with respect to each starting material. All of the rate constants were roughly proportional to the 1.5th power of the surface acidity of 1≤H0≤3 of catalysts and the 2.2nd power of the pressure of VI. The apparent activation energies were 22 kcal/mol for Steps I→II, II→2,4-diisopropyl-5-methylphenol (V), and III→V and 6.5 kcal/mol for Steps I→III and II→2,6-diisopropyl-5-methylphenol (IV).