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The stereochemistry of the product resulting from the rearangement of (1S,3R,8R,9R,10R)‐9,10‐epoxy‐3,7,7,10‐tetramethyltricyclo[6,4,0,01,3]dodecane has been established by X‐ray crystallography. The molecule, C32H50O, is composed of two distinct parts linked by a dioxo bond. In each part of the molecule, the conformation of the six‐membered ring is imposed by the position of the double bond.

To a mixture of (0.85 g, 4.9 mmol) of metachloroperoxybenzoic acid (mCPBA) [1,2] and (1.63 g, 19.6 mmol) of sodium hydrogenocarbonate (NaHCO3) in 20 ml of dichloromethane was added (1 g, 2.42 mmol) of 1 in 10 ml of CH2Cl2.[...]