A new method for the preparation of dienylcobaloxime complexes which involves reactions of cobaloxime anions and/or hydrides with enynes is reported. This new dienyl complex preparative method leads to cobalt-substituted 1,3-or 1,2-dienes depending on the enyne substitution pattern chosen. Subsequent Diels-Alder reactions of the 1,3-dienyl complexes and demetalation reactions of cobalt-substituted cycloadducts are also reported.
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