Characterization of a Silver Vinylcarbene Intermediate in Carbene–Alkyne Metathesis and Its Concerted C(sp 2 )–H Bond Insertion - Àlex Díaz-Jiménez; Roger Monreal-Corona; Arijit Saha; Andrea Álvarez-Núñez; Anna Company; Teodor Parella; Pedro J. Pérez; Ana Caballero; Anna Roglans; Albert Poater; Anna Pla-Quintana (Journal of the American Chemical Society, 2026)