The irradiation of 2-methoxytropone (12-A) leads to methyl 4-oxo-2-cyclopentenylacetate (12-D). The course of the reaction can be followed by gas chromatography and two intermediates are observed, which have structures 12-B and 12-C. Indicate a mechanism for the three successive reactions. The first two are photochemical, whereas the third is probably an acid-catalyzed reaction that does not require light.
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