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. 2024 May 29;15:4579. doi: 10.1038/s41467-024-49042-1

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© The Author(s) 2024, corrected publication 2024

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Fig. 1 — a Schematic depiction of Büchner ring expansion and the equilibria between cycloheptatriene (CHT) and norcaradiene (NCD); R is organic substituent. b Selected examples of P(III) precursors as synthons of transient phosphinidenes; R is organic substituent, and L is coordinating ligand.