Secondary phosphine oxides (SPOs) have been widely used for the synthesis of tertiary phosphine oxides and have found applications as Wittig–Horner reagents [1–2] and, later, as effective ligands for transition-metal complexes.[3] Recently, Li et al. showed that SPOs form air-stable palladium complexes, such as POPd1, when they are mixed with PdCl2 (MeCN) 2 and then treated with Et3N.[4] These complexes proved efficient as catalysts in ...
