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A reactor was charged with 0.123 g (S)-zopiclone. To the reactor was added 0.056 g benzenesulfonic acid. The reaction was agitated and charged with 17.2 g ethanol. The reaction was cooled to 0° C., and the reaction was allowed to stir for greater than one hour after a slurry appeared. The reaction mixture was filtered and washed once with 0.5 g ethanol, dried in vacuo at approximately 50° C. for approximately 6 h to yield the titled compound in 52% yield.

1. stirringto stir for greater than one hour after a slurry
2. filtrationThe reaction mixture was filtered
3. washwashed once with 0.5 g ethanol
4. customdried in vacuo at approximately 50° C. for approximately 6 h