[BH4-].[Na+].[C:3]([CH:6]1[CH2:10][CH2:9][CH:8]([CH3:11])[C:7]1([CH3:14])[CH:12]=[O:13])([CH3:5])=[CH2:4]>C(O)(C)C>[C:3]([CH:6]1[CH2:10][CH2:9][CH:8]([CH3:11])[C:7]1([CH3:14])[CH2:12][OH:13])([CH3:5])=[CH2:4]Into a 250 ml flask equipped with stirrer, thermometer reflux condensor, heating mantle and nitrogen blanket apparatus are placed 15 grams of sodium borohydride, 100 ml anhydrous isopropyl alcohol and 65 grams of 2-isopropenyl-1,5-dimethylcyclopentane carboxaldehyde having the structure: ##STR26## prepared according to U.S. Pat. No. 4,474,992 issued on Oct. 2, 1984.
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