Thermal decomposition of the dry sodium salt (3) of 4-hydroxy-4-methylvaleric acid γ-lactone toluene-p-sulphonylhydrazone leads to 2,2-dimethylcyclobutanone (7) and 2,2-dimethyl-2,3-dihydrofuran (8).
W. C. Agosta and A. M. Foster, J. Chem. Soc. D, 1971, 433 DOI: 10.1039/C29710000433
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