Transition metal-catalysed carbene- and nitrene transfer to the C1-building blocks carbon monoxide and isocyanides provides heteroallenes (i.e. ketenes, isocyanates, ketenimines and carbodiimides). These are versatile and reactive compounds allowing in situ transformation towards numerous functional groups and organic compounds, including heterocycles. Both one-pot and tandem processes have been developed providing valuable synthetic methods for the organic chemistry toolbox. This review discusses all known transition metal-catalysed carbene- and nitrene transfer reactions towards carbon monoxide and isocyanides and in situ transformation of the heteroallenes hereby obtained, with a special focus on the general mechanistic considerations.

中文翻译：

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过渡金属催化的卡宾和氮烯转移为一氧化碳和异氰化物

过渡金属催化的卡宾和氮宾转移至C1结构单元一氧化碳和异氰化物，提供杂丙二烯（即烯酮、异氰酸酯、烯酮亚胺和碳二亚胺）。这些是多用途的反应性化合物，允许原位转化为多种官能团和有机化合物，包括杂环。一锅法和串联法均已开发出来，为有机化学工具箱提供了有价值的合成方法。本综述讨论了所有已知的过渡金属催化的卡宾和氮烯向一氧化碳和异氰化物的转移反应以及由此获得的杂丙二烯的原位转化，特别关注一般机理考虑。