5675quenched with the addition of 5 mL of 5% aqueous NapSz03. The resulting mixture was then extracted with diethyl ether (50 mL). The organic layer was washed with 5% aqueous Na2S203 (20 mL) and brine (50 mL) and dried over anhydrous MgSO,, and the solvent was evaporated under reduced pressure. The residue thus obtained was purified by flash column chromatography on silica gel with hexanes as the eluent. Recrystallization from petroleum ether afforded an analytical sample.
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