Pyrrole Formation via Reactivity of η4-(Vinylketenimine)iron Complexes with Electron-Deficient Alkynes

: When electron-deficient alkynes reacted with η 4 -(vinylketenimine)iron complexes, pyrroles were produced. Pyrrole formation involved the [2+3] cycloaddition of alkyne to the ketenimine moiety, migration of the vinyl group, and decomplexation. Either alkynes bearing two electron-withdrawing groups, or terminal alkynes with an electron-withdrawing group reacted to generate pyrroles.

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