Harnessing strained ring metal carbenes in transition-metal catalysis

-sulfonylhydrazones, [1.1.1]propellane, and strained methylenecyclobutane derivatives. It aims to highlight developments and applications of strained metal carbene species, with a particular emphasis on reaction mechanistic insights, selectivity control, and merits and limitations of each strategy, alongside their potential implications for synthetic and medicinal chemistry. We hope that this review will stimulate further innovation among researchers in strained metal carbene chemistry and beyond.