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π SIMILAR VOLUMES
The Cyclopropylalkylidenecyclopropane Thermal Double Ring Expansion. A Novel Route to the Bicyclo[5.3.1]undecane Skeleton of the AB Ring System of Taxanes. -The mechanism of the reaction is explained by the initial formation of a diradical followed by opening to a homoallylic biradical which closes
The functionalized tricyclic framework (XI) of the diterpene forskolin is synthesized by an intramolecular Diels-Alder reaction of the dienyne (VII), which is obtained by stereoselective introduction of the C side chains at C-1 and C-2 of tri-O-acetyl-D-galactal (I) via C-Ferrier and Claisen-Ireland