Vibrational spectroscopy and EXAFS studies of an organotin molybdate with the formula [((Me)(2)(menthyl)Sn)(2)MoO4(H2O)(3.5)] reveal that the compound is polymeric and contains [MoO4](2-) tetrahedra coordinated to [R3Sn](+) cationic spacers. The compound can be used as a recyclable solid catalyst for the selective epoxidation of cyclooctene by tert-butylhydroperoxide. In the epoxidation of prochiral olefins such as trans-beta-methylstyrene, the corresponding epoxide isomers are obtained with fairly good to excellent selectivity, albeit with low enantiomeric or diastereomeric excesses.