Abstract
AbstractHerein we report that 1,4‐dilithio‐1,3‐butadienes, a type of 1,3‐butadienyl dianion, can act as non‐innocent ligands, taking electrons from low‐valent transition metals. Dilithio reagents reacted with [{RhCl(cod)}2] to give dilithio rhodacycle 3 a. Single‐crystal X‐ray structural analysis revealed the structure of 3 a with averaged bond lengths. XPS data suggested that the oxidation state of Rh in 3 a was more likely to be Rh3+. CDA/ECDA confirmed the electron‐transfer process. 7Li NMR spectra of 3 a and theoretical calculations revealed a considerable aromatic character. In this process, the dilithio compounds behaved as non‐innocent ligands and formal oxidants. These results demonstrated that organolithium compounds with suitable π‐conjugation could be used as electron acceptor.
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