[C:1]1(=[O:6])[CH2:5][CH2:4][CH:3]=[CH:2]1.[CH2:7]([O:9][C:10]([O:12][CH2:13][CH3:14])=[CH2:11])[CH3:8]>CCCCC>[CH2:7]([O:9][C:10]1([O:12][CH2:13][CH3:14])[CH2:11][CH:5]2[CH:4]1[CH2:3][CH2:2][C:1]2=[O:6])[CH3:8]To a solution of cyclopent-2-enone (3.7 g, 45 mmol) in pentane (80 mL) was added 1,1-diethoxyethene (89 mL, 677 mmol). The mixture was put in an ACE Photo Reactor (450 W lamp), and stirred at RT for 20 hr. It was concentrated to give the title compound as a pale yellow oil.
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