The reverse Diels-Alder reaction, or as the German literature refers to it, the retrodiene decomposition, is almost as old as the Diels-Alder itself. In 1929 Diels and Alder1 reported the preparation of the adduct of to react with acetylenedicarboxylic ester for 2 hr at 200°, gives 4-methylphthalic acid and 3-methyl-l-CH,•CTKCHj).
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