[CH3:1][C:2](O)([CH2:5][CH2:6][CH:7]=[C:8]([CH3:19])[CH2:9][CH2:10][CH:11]=[C:12]([CH3:18])[CH2:13][O:14][CH2:15][O:16][CH3:17])[CH:3]=[CH2:4].[Cr](Cl)([O-])(=O)=[O:22].[NH+]1C=CC=CC=1.CCCCCC.C(OCC)(=O)C>ClCCl.CCOCC>[CH3:17][O:16][CH2:15][O:14][CH2:13][C:12]([CH3:18])=[CH:11][CH2:10][CH2:9][C:8]([CH3:19])=[CH:7][CH2:6][CH2:5][C:2]([CH3:1])=[CH:3][CH:4]=[O:22]A solution of 3,7,11-trimethyl-12-(methoxymethyl)oxy-1,6,10-dodecatrien-3-ol (460 mg, 1.6 mmol) in dichloromethane (30 ml) was added pyridinium chlorochromate (690 mg, 3.2 mmol), and the mixture was stirred at room temperature for 8 hours. After addition of a mixture of hexane, ethyl acetate, and ether (3:1:1) (100 ml), the mixture was stirred and insoluble materials were filtered. The filtrate was concentrated in vacuo, and the residue was purified with silica gel column chromatography to give 12-(methoxymethyl)oxy-3,7,11-trimethyl-2,6,10-dodecatrienal (233 mg, 52%). The physico-chemical properties of the product was the same as those described in Reference Example 1.
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