O=[C:2]1[CH2:9][C:6]([CH3:8])([CH3:7])[CH2:5][C:4]([CH3:10])=[CH:3]1.[C:11]([O:14][CH:15]=[CH2:16])(=[O:13])[CH3:12]>>[CH3:7][C:6]1([CH3:9])[CH2:5][C:4]2([CH3:10])[CH:14]([CH2:2][CH2:3]2)[C:15](=[O:16])[CH2:8]1.[C:11]([O-:14])(=[O:13])[CH3:12]The photochemical reaction system of this invention is illustrated by another dual irradiation in which the inner flask reaction is the same as in Example 1, but in which the photochemical reaction in the outer flask consists in reacting isophorone with vinyl acetate to yield 4,4,6-trimethyl bicyclo[4.2.0]octane-2-one (7 or 8) acetate: ##STR3##
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