The epoxidation of 1,4-bis(allyloxy)butane to give 1-allyloxy-4-glycidoloxybutane and 1,4-bis(glycidoloxy)butane was investigated. The reaction was carried Out with 30 wt % hydrogen peroxide under phase transfer catalysis (PTC) conditions in the presence of sodium tungstate(VI) dihydrate and orthophosphoric(V) acid (WO42-/PO43-). Methyltrioctylammonium chloride (Aliquat 336) was used as the phase transfer catalyst. The effect of agitation speed and reaction temperature on the yield of epoxidation products was determined.