To a mixture of 0.39 g of 4-(2,6-diethyl-4-(3,3-dichloro-2-propenyloxy)phenoxy)butyloxyacetaldehyde, 0.16 g of 1-propanethiol and 10 ml of chloroform was slowly added dropwise 0.16 g of trimethylsilyl chloride with stirring at room temperature. After stirring at room temperature for 3 hours, the reaction mixture was poured into 5% aqueous sodium carbonate solution and extracted twice with diethyl ether. The diethyl ether layers were combined, washed with water, dried over magnesium sulfate and then evaporated to give a crude product. The crude product was subjected to silica gel chromatography, which afforded 0.20 g of 3,5-diethyl-1-(3,3-dichloro-2-propenyloxy)-4-(4-(2,2-di(propylthio)ethoxy)butyloxy)benzene (yield, 41%), nD26.4 1.5300.
