When electron-deficient alkynes reacted with η⁴-(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.

中文翻译：

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通过 η4-（乙烯基烯酮亚胺）铁配合物与缺电子炔烃的反应形成吡咯

当缺电子炔烃与 η ⁴ -(乙烯基烯酮亚胺)铁配合物反应时，产生吡咯。吡咯的形成涉及炔烃与烯酮亚胺部分的 [2 + 3] 环加成、乙烯基的迁移和解络。带有两个吸电子基团的炔烃或带有吸电子基团的末端炔烃反应生成吡咯。