Synthesis and Characterization of a Carbene‐Stabilized Silylene–Phosphinidene

The isolation of silylene–phosphinidene is challenging due to its rapid dimerization or oligomerization during the reaction. Recently, the synthesis of a novel silylene ( 1 ) is reported, which leads to the formation of an unsymmetrical bis‐silylene ( 2 ), and it's their intriguing reactivity toward silylene(II) is further studied. Expanding on this reactivity, the reaction of 2 with Me cAACPCl is explored, which affords silylene–phosphinidene [R(MecAAC)SiPCAAc Me ( 3 )] oxidatively in low yield. Alternatively, when RSiCl(CAAc Me ) ( 1 ) is treated with Me cAACPCl under reducing conditions, compound 3 is obtained in an isolated yield of 78%. In addition, quantum chemical calculations are carried out to elucidate the electronic structures of compounds 3 and 4 , providing deeper insight into the nature of their chemical bonding.