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We propose a ruthenium(II)‐catalyzed C─H vinylation of 1‐aryl urazoles using calcium carbide (CaC 2 ). Notably, hexafluoroisopropanol (HFIP) may promote the rapid dissociation of CaC 2 to generate a reactive acetylene–Ca–alkoxide species, which involves migration and protonation pathways with a ruthenacycle complex. The resulting vinylated products can be further diversified through one‐pot reactions and post‐transformations, underscoring the synthetic value of this method.
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Park et al. (2026) studied this question.
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