Reversible Stannylenoid Formation from the Corresponding Stannylene and Sodium Phosphaethynolate

This study reports the synthesis of a novel stannylenoid 2 through the reaction of dialkylstannylene with sodium phosphaethynolate (NaOCP), followed by investigation of its reactivity and stability. Stannylenoid 2 exhibits high stability in THF and remains intact under elevated temperatures for extended periods. Upon irradiation, 2 undergoes CO release reaction, forming a highly stable compound 7. The solid‐state structure of 7, determined by single‐crystal X‐ray diffraction, reveals a diamond‐shaped Sn₂P₂ moiety with distorted tetrahedral geometry. Computational studies using density functional theory (DFT) confirm the experimental findings, showing strong Sn−P bonding and a nucleophilic character for the phosphorus atoms. The results provide new insights into the reactivity of stannylenoids and their potential applications in synthetic chemistry.