Cyclohexen-1-ol is a cyclic alcohol with a double bond, specifically it is a cyclohexene molecule with a hydroxyl group (-OH) attached to one of the carbon atoms in the ring.
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Preparation of cyclohexenol 16. DMAP=4-(dimethylamino)-pyridine, Cbz=benzyloxycarbonyl, THF=tetrahydrofuran, TBS=tert-butyldimethylsilyl, dppf=1,1'-bis(diphenylphosphino)ferrocene.