Dispiro-1,2,4-trioxane derivatives 3, on thermolysis in decane at 190 °C, afford either oxalactones 4, or ketolactones 5, or mixtures of both as the predominant ring-expansion products depending on the respective natures of the dispiro substituents.
A. Haq, B. Kerr and K. J. McCullough, J. Chem. Soc., Chem. Commun., 1993, 1076 DOI: 10.1039/C39930001076
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