[gamma]-Lactones: Methyl 11-Oxa-10-oxobicyclo[6.3.0]undec-4-ene-9-carboxylate, Methyl 11-Oxa-10-oxobicyclo[6.3.0]undec-2-ene-9-carboxylate and Methyl 9-Oxa-10-oxobicyclo[6.3.0]undecane-11-carboxylate

The structures of three [gamma]-lactone derivatives, methyl 11-oxa-10-oxobicyclo[6.3.0]undec-4-ene-9-carboxylate, C₁₂H₁₆O₄, methyl 11-oxa-10-oxobicyclo[6.3.0]undec-2-ene-9-carboxylate, C₁₂H₁₆O₄ and methyl 9-oxa-10-oxobicyclo[6.3.0]undecane-11-carboxylate, C₁₂H₁₈O₄, have been solved in order to determine the relative configuration of their three asymmetric stereocentres.

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