Vibrational spectroscopy and EXAFS studies of an organotin molybdate with the formula [((Me) 2 (menthyl)Sn) 2 MoO 4 (H 2 O) 3.5 ] reveal that the compound is polymeric and contains [MoO 4 ] 2) tetrahedra coordinated to [R 3 Sn] + 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-b-methylstyrene, the corresponding epoxide isomers are obtained with fairly good to excellent selectivity, albeit with low enantiomeric or diastereomeric excesses.