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Packed with functionality: The key step in the title reactions with acetone cyanohydrin is a regioselective hydronickelation of allenes. Subsequent carbometalation of the alkyne followed by reductive elimination gave cyano‐functionalized tetrasubstituted alkenes in a regio‐ and stereoselective manner (see scheme; EWG=electron‐withdrawing group, Ts=p‐toluenesulfonyl).
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