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Catalysis of Friedel‐Crafts Alkylation by a Montmorillonite Doped with Transition‐Metal Cations
Author(s) -
Laszlo Pierre,
Mathy Arthur
Publication year - 1987
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19870700310
Subject(s) - chemistry , friedel–crafts reaction , catalysis , montmorillonite , alkylation , halide , transition metal , lewis acids and bases , homogeneous , metal halides , metal , doping , inorganic chemistry , organic chemistry , heterogeneous catalysis , thermodynamics , physics , optoelectronics
Catalysts are obtained by exchange of the interstitial cations in the K10 montmorillonite. They are applied to Friedel‐Crafts alkylations with halides, alcohols, and olefins. They are quite effective even with unactivated hydrocarbons. Isomer distribution depends little on the catalyst used. Thermodynamic equilibration does not take place, the reactions appear to be kinetically controlled. Efficiency of the catalysts bears no apparent relation to that of the corresponding Lewis acids under homogeneous conditions, and it depends on the nature of the alkylating agent. Zr( IV ) and Ti( IV ), in general, give the best results.