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Selective Ortho Alkylation of Phenol With Alcohols Over Catalysts Derived From Hydrotalcite-Like Anionic Clays

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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.

Affiliations: 1: Present address: Ceramics Technology Department, National Research Institute of Nagoya, Nagoya-462, JAPAN; 2: Department of Chemistry, Indian Institute of Technology, Madras-600 036, INDIA


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