“…However, to date, only three major intermolecular reaction classes have been reported for these intermediates (Figure B), the most frequently studied being nucleophilic trappings (e.g., 7 + KO t- Bu → 6 ) and cycloadditions (e.g., 7 + 8 → 9 ) . More than 50 studies detailing such reactions have been reported, including more recent studies by Guitián, , West, − Okano and Mori, , Schreiber, and our laboratory. − A complementary, albeit rarely studied, approach utilizes transition metal catalysis to intercept the cyclic allene (e.g., 7 + 10 → 11 ). , However, this strategy poses an inherent kinetic challenge due to the requirement for reaction between a catalytically generated intermediate and an in situ generated fleeting cyclic allene, both of which are present in low concentration.…”