Selective Ortho alkylation of phenol with alcohols over catalysts derived from hydrotalcite-like anionic clays |
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| Authors: | S Velu C S Swamy |
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| Institution: | (1) Department of Chemistry, Indian Institute of Technology, Madras, 600 036, India;(2) Present address: Ceramics Technology Department, National Research Institute of Nagoya, Nagoya 462, Japan |
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| Abstract: | The vapour phase alkylation of phenol with a series of alcohols containing different number of carbons ranging from C1 to C8 were investigated over catalysts derived from magnesium-aluminium hydrotalcite with Mg/Al atomic ratio 3 (MgAl 3.0-HT). The
results indicated that at 623 K the catalytic activity for phenol conversion increased with increasing chain length of linear
long chain alcohols to give 2-alkylated linear alkyl phenols, without any isomerisation of the alkyl moiety. Isomorphous substitution
of Mg2+ by Cu2+ or Ni2+ in the MgAl 3.0-HT resulted in an increase in selectivity of 2-alkyl and 2,6-dialkylphenols (≈60%) in the alkylation of phenol
with 1-hexanol or 1-octanol. |
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