Studies on the Hydroalkylation of Benzene and Methylbenzenes in the Presence of a Combination Catalyst of Pd-Al2O3 and NaCl-AlCl3

The mechanism of the hydroalkylation of benzene and methylbenzenes to cyclohexylbenzenes was studied in the presence of a palladium-fused salt (NaCl-AlCl3) catalyst under hydrogen pressure. The activities of the hydrogenation catalyst and the alkylation catalyst were each estimated kinetically. The...

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Bibliographic Details
Published inChemical & pharmaceutical bulletin Vol. 35; no. 4; pp. 1334 - 1338
Main Authors KAMIYAMA, TSUTOMU, ENOMOTO, SABURO, INOUE, MASAMI
Format Journal Article
LanguageEnglish
Published Tokyo The Pharmaceutical Society of Japan 1987
Maruzen
Japan Science and Technology Agency
Subjects
benzene
Chemistry
cyclohexene
cyclohexylbenzene
Exact sciences and technology
fused salt
hydroalkylation
Kinetics and mechanisms
mechanism
Organic chemistry
palladium catalyst
Reactivity and mechanisms
Mixed catalyst
Substituent effect
Aluminium III Chlorides
Arrhenius equation
Palladium
Rate constant
Hydrogenation
Alkylation
Supported catalyst
Sodium Chlorides
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Summary:The mechanism of the hydroalkylation of benzene and methylbenzenes to cyclohexylbenzenes was studied in the presence of a palladium-fused salt (NaCl-AlCl3) catalyst under hydrogen pressure. The activities of the hydrogenation catalyst and the alkylation catalyst were each estimated kinetically. The activity of the fused salt was compared with that of anhydrous aluminum chloride for the alkylation of aromatic compounds. The rate constants and Arrhenius parameters of the hydrogenation on palladium and the alkylation on the fused salt supported the presence of the cyclohexyl cation as an intermediate species in the hydroalkylation.
ISSN:0009-2363
1347-5223
DOI:10.1248/cpb.35.1334