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The extra‐ligand‐free CuTC‐catalyzed CP cross coupling reaction of propargylic acetates with H‐phosphine oxides is reported to afford allenylphosphine oxides. The reaction took place efficiently with diphenylphosphine oxide and electron‐deficient di(4‐fluorophenyl)phosphine oxide, but less effectively with electron‐rich ones such as di(4‐methoxylphenyl)phosphine oxide and dialkylphosphine oxides. H‐phosphine oxides themselves may serve as the ligand.
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Liu et al. (2025) studied this question.
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