Beiträge zur Chemie des Phosphors. 181 [1, 2]. Dinatrium-hydrogenhenicosaphosphid Na2HP21

Contributions to the Chemistry of Phosphorus. 181. Dinatrium Hydrogen Henicosaphosphide Na₂HP₂₁ The hydrogen henicosaphosphide Na₂HP₂₁ ( 2 ) has been obtained as the final product in the reaction of trisodium henicosaphosphide, Na₃P₂₁ ( 1 ), with acetylacetone or glacial acetic acid. The attack of the proton occurs at the phosphide P atom of the P₇(5)? middle group analogous to norbornane, the site of greatest nucleophilicity of the P₂₁^3? ion. The basicity of the HP₂₁^2? ion toward the above-mentioned protonating agents is not sufficient for the formation of P₂₁H₃; a rearrangement of the P₂₁(3) skeleton takes place on reaction with stronger acids.