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. 2023 Apr 6;13(8):5428–5448. doi: 10.1021/acscatal.3c00591

Scheme 3. Redox Chemistry of Early Transition Metal Carbenes.

Scheme 3

(A) Locus of redox events in Fischer carbene metal carbonyl complexes. (B) Electronic communication in reduced biscarbenes. (C) Electronically separated communication in ferrocenyl-based biscarbene metal carbonyl complexes. (D) Stepwise oxidation of a divinyl-bridged ferrocenyl derivative to a Fischer carbene, which proceeds via a carbene radical stage.