S. Velu et Cs. Swamy, Selective ortho alkylation of phenol with alcohols over catalysts derived from hydrotalcite-like anionic clays, RES CHEM IN, 26(3), 2000, pp. 295-302
The vapour phase alkylation of phenol with a series of alcohols containing
different number of carbons ranging from C-1 to C-8 were investigated over
catalysts derived from magnesium-aluminium hydrotalcite with Mg/Al atomic r
atio 3 (MgAl 3.0-HT). The results indicated that at 623 K the catalytic act
ivity for phenol conversion increased with increasing chain length of linea
r 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-a
lkyl and 2,6-dialkylphenols (approximate to 60 %) in the alkylation of phen
ol with 1-hexanol or 1-octanol.