The rates of decarboxylation of 2-oxo-1-oxaspiro[4,5]decane-4-carboxylic acid have been measured at five temperatures between 455·6 and 498·9°K. The reaction is first order and homogeneous with ΔH‡= 29·0 kcal. mole–1 and ΔS‡=–13·6 e.u. at 500°K, which suggests a concerted intramolecular mechanism for decomposition.
D. B. Bigley and R. W. May, J. Chem. Soc. B, 1969, 994 DOI: 10.1039/J29690000994
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