Double stereocontrol is achieved in the Pd-catalyzed cyclization of Δ -oxonene precursors (see reactions outlined below). The configuration of the olefinic double bond and of the allylic carbon center α to the ether oxygen atom is dictated by the configuration of the double bond in the starting compound (E/Z), the Pd ligand (dppe = Ph PCH CH PPh ), and the reaction time.
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