The equilibrium proportions of the constitutional isomers (1)–(4) and the conformational behaviour of the cis-fused 1,3,6,8-tetraoxabicyclo[5,3,0]decanes (1a)–(4a) provide no evidence for the gauche arrangement of the vicinal oxygen substituents being a stabilising feature in these systems.
I. J. Burden and J. F. Stoddart, J. Chem. Soc., Chem. Commun., 1974, 863b DOI: 10.1039/C3974000863B
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