[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]([CH3:15])([CH3:14])[C:9](F)=[CH:10][C:11]#N)=[CH:4][CH:3]=1.[H-].C([Al+]CC(C)C)C(C)C.C([O:28]CC)C>CCCCCC.O.Cl>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]([CH3:15])([CH3:14])[CH:9]=[CH:10][CH:11]=[O:28])=[CH:4][CH:3]=1A solution of 4-(p-chlorophenyl)-3-fluoro-4-methyl-2-pentenenitrile, (Z)- (15.6 g, 69.7 mmol) in diethyl ether is treated dropwise with diisobutylaluminum hydride (83.6 mmol, 83.6 mL of a 1M solution in hexane) over 90 minutes at -45° C. under nitrogen, stirred at -40° C. for 35 minutes, and diluted sequentially with water and 2N hydrochloric acid at -10° C. The resultant aqueous mixture is stirred at room temperature for one hour and extracted with diethyl ether. The organic extracts are combined, washed.sequentially with water, 2N hydrochloric acid and water, dried over anhydrous sodium sulfate, and concentrated in vacuo to give the title product as a brown oil (15.34 g, 97% yield).
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