09-11-2021-2205 - 1,2-Bis(diphenylphosphino)ethane (dppe)

 1,2-Bis(diphenylphosphino)ethane (dppe) is an organophosphorus compound with the formula (Ph₂PCH₂)₂ (Ph = phenyl). It is a commonly used bidentate ligand in coordination chemistry. It is a white solid that is soluble in organic solvents.

The preparation of dppe is by the alkylation of NaPPh₂:^[1][2]

P(C₆H₅)₃ + 2 Na → NaP(C₆H₅)₂ + NaC₆H₅

NaP(C₆H₅)₂, which is readily air-oxidized, is treated with 1,2-dichloroethane(ClCH₂CH₂Cl) to give dppe:

2 NaP(C₆H₅)₂ + ClCH₂CH₂Cl → (C₆H₅)₂PCH₂CH₂P(C₆H₅)₂ + 2 NaCl

https://en.wikipedia.org/wiki/1,2-Bis(diphenylphosphino)ethane