[Cl:1][CH2:2][CH2:3][CH2:4][S:5]([O:8][CH2:9][C:10]([CH3:23])([CH3:22])[CH:11]([O:14][CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[CH:12]=C)(=[O:7])=[O:6].O=O.[O:26]=[O+][O-].CSC>ClCCl>[Cl:1][CH2:2][CH2:3][CH2:4][S:5]([O:8][CH2:9][C:10]([CH3:22])([CH3:23])[CH:11]([O:14][CH2:15][C:16]1[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=1)[CH:12]=[O:26])(=[O:6])=[O:7]Following the general procedure for the preparation of aldehydes from alkenes of Description 11, (3R/S)-2,2-dimethyl-3-(phenylmethoxy)pent-4-enyl (3-chloropropyl]sulfonate (12a) (10.0 g, 27.7 mmol) dissolved in 150 mL of dichloromethane (DCM) was treated with a mixture of oxygen and ozone (O2/O3). Upon completion of the reaction, 4.0 mL (3.4 g, 55 mmol) of dimethyl sulfide (DMS) was added. After work-up, the crude material was purified by silica gel column chromatography using a mixture of ethyl acetate (EtOAc) and hexane (Hxn) (EtOAc/Hxn=1:2) as eluent to provide 7.6 g (76% yield) of the title compound (12b) as a colorless oil. The analytical data was consistent with the proposed structure and the data obtained for the enantiopure compound (11b).
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