Cycloaddition reactions. Thermal addition of dimethyl acetylenedicarboxylate to 1-methoxyindene

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Abstract
The cycloaddition of 1-methoxyindene 2 to dimethyl acetylenedicarboxylate to form a fused cyclobutene system 3 is discussed. Photochemical ring enlargement of 3 leads to a benzocycloheptatriene system 5 while reduction yields a dihydro derivative 4. Saponification of 3 followed by photochemical ring expansion yields the diacid 7 which is subsequently hydrolyzed and decarboxylated to ketoacid 8.

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