title: Tetraphenyldiphosphine
text: # Tetraphenyldiphosphine
  
  Tetraphenyldiphosphine is the organophosphorus compound with the formula $[PPh_2]_2,$ where Ph = phenyl $(C_6H_5).$ It is a white, air-sensitive solid that dissolves in nonpolar solvents. It is a centrosymmetric molecule with a P-P bond of 2.2592 Å.
  
  Tetraphenyldiphosphine is produced by reductive coupling of chlorodiphenylphosphine:
  
      2 $Ph_2PCl$ + 2 Na → $Ph_2P-PPh_2$ + 2 NaCl
  
  The compound is used as a source of the $Ph_2P^−$ group.
  
      $Ph_2P-PPh_2$ + 2 Na → + 2 $NaPPh_2$
  