After a partial deactivation, g-alumina (g-Al2O3) is a good catalyst for selective methylation of 1,2-benzenediol at 260-310 Deg. The main products are the desired 3-methyl-1,2-benzenediol and 2-methoxyphenol, which may be converted in another step into 3-methyl-1,2-benzenediol, giving an overall selectivity for the desired products of 80 to 90%. The catechol forms a strongly chemisorbed surface species on g-alumina and its steric-adsorption model correlates with the kinetic data. [on SciFinder (R)]