The ether product has the same absolute confguration as the starting alkoxide because nobonds to the stereogenic center are made or broken in the reaction.(c)Vicinal halohydrins are converted to epoxides on being treated with base.(d)The reactants, an alkene plus a peroxy acid, are customary ones for epoxide preparation. Thereaction is a stereospecifc syn addition of oxygen to the double bond.(e)Azide ion is a good nucleophile and attacks the epoxide function. Substitution occurs at carbonwith inversion of confguration. The product istrans-2-azidocyclohexanol.(f)Ammonia is a nucleophile capable of reacting with epoxides. It attacks the less hindered car-bon of the epoxide function.Aryl halides do not react with nucleophiles under these conditions, and so the bromine sub-
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