SCHEDULED MAINTENANCE
Re-examination of the isomerisation of 1,1′-epoxybicyclohexyl-2-one into spiro-diketones has confirmed that reaction with antimony pentachloride in sulphur dioxide affords cycloheptanespirocyclohexane-2,7-dione, whereas thermal rearrangement gives cycloheptanespirocyclohexan-2,2′-dione.
E. G. E. Hawkins and R. Large, J. Chem. Soc., Perkin Trans. 1, 1973, 2169 DOI: 10.1039/P19730002169
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