C(OP([CH:9]([CH:12]([CH3:14])[CH3:13])[C:10]#[N:11])(OCC)=O)C.C[Si]([N-][Si](C)(C)C)(C)C.[K+].[CH3:25][C:26](=[CH:28][CH2:29][CH2:30]/[C:31](=[CH:33]/[CH:34]=O)/[CH3:32])[CH3:27].O>C1(C)C=CC=CC=1.CCCCCC.C(OCC)(=O)C>[CH3:14][CH:12]([C:9](=[CH:34][CH:33]=[C:31]([CH3:32])[CH2:30][CH2:29][CH:28]=[C:26]([CH3:27])[CH3:25])[C:10]#[N:11])[CH3:13]To a solution of 2-(diethylphosphono)isovaleronitrile (6.54 g, 30 mmol) in toluene (55 ml) was added a 0.5M solution of potassium bis(trimethylsilyl)amide in toluene (56 ml) with stirring on a cooling bath at -70° C. After 30 minutes, geranial (3.80 g, 25 mmol) was added thereto with continuous stirring at the same temperature, and then the reaction mixture was warmed up to room temperature. After addition of water to the mixture, the organic layer was extracted. The organic extract was washed with saturated aqueous sodium bicarbonate and saturated aqueous sodium chloride, dried over MgSO4, and filtered. The filtrate was concentrated to give a residue, which was then subjected to silica gel column chromatography (solvent: n-hexane/ethyl acetate=100:l) to give 2-(1-methylethyl)-5,9-dimethyl-2,4,8-decatrienenitrile (4.87 g, 90%, 2Z:2E=22.4:1).
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