Vapour phase O-methylation of 2-naphthol over the solid bases alkali-loaded silica and Cs-loaded MCM-41

O-alkylation of 2-naphthol has been investigated in the vapour phase over a lkali-loaded fumed silica and Cs-MCM-41. Both SiO2 and MCM-41 had low C-alk ylation activities and no O-alkylation activity. The introduction of alkali ions considerably increases 2-naphthol conversion with 2-methoxynaphthalen e being the major product. The activity of the catalysts increases with alk ali loading and the basicity of the metal (Cs >K > Na > Li). Very high conv ersion (similar to 99%) of 2-naphthol and selectivity (> 95%) for 2-methoxy naphthalene are obtained over Cs-loaded fumed silica and MCM-41. A small am ount of 1-methyl-2-hydroxynaphthalene is also formed over the Li-, Na- and K-loaded silica.