Golden metamorphose! The cover picture shows a linear unsaturated molecule, which in the presence of a gold catalyst rearranges to a complicated branched product, an isomerization involving an oxygen atom transfer. This resembles the fascinating metamorphose of a caterpillar to a butterfly. In their Full Paper on p. 1200 ff., A. S. K. Hashmi, K. Graf et al. report that this conversion proceeds in a highly diastereoselective manner. A complex cascade involving activation by π coordination of gold, a [3,3]-sigmatropic rearrangement, and an electrocyclic ring opening is suggested as the mechanism of this conversion.
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