[BH4-].[Na+].[Cl-].[Cl-].[Cl-].[Ce+3].[CH3:7][C:8](=[CH:12][CH2:13][CH:14]1[CH2:19][CH:18]2[C:16]([CH3:20])([CH2:17]2)[C:15]1([CH3:22])[CH3:21])[C:9](=[O:11])[CH3:10].O>CO>[CH3:7][C:8](=[CH:12][CH2:13][CH:14]1[CH2:19][CH:18]2[C:16]([CH3:20])([CH2:17]2)[C:15]1([CH3:21])[CH3:22])[CH:9]([OH:11])[CH3:10]0.37 g (10 mmol) of sodium borohydride was added portionwise with cooling to the solution of 3.7 g (10 mmol) of cerium trichloride and 2.0 g (10 mmol) of 3-methyl-5-(1,2,2-trimethylbicyclo[3.1.0]hex-3-yl)pent-3-en-2-one in 25 ml of methanol. After 5 more minutes water was added and the mixture extracted with diethyl ether, dried (MgSO4) and evaporated in vacuo. Purification by flash. chromatography on silica gel (eluent: hexane/MTBE 9:1) gave 1.3 g (58% yield) of 3-methyl-5-(1,2,2-trimethylbicyclo [3.1.0]hex-3-yl)pent-3-en-2-ol.
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