Английская Википедия:1,2-Bis(dimethylphosphino)ethane
1,2-Bis(dimethylphosphino)ethane (dmpe) is a diphosphine ligand in coordination chemistry. It is a colorless, air-sensitive liquid that is soluble in organic solvents. With the formula (CHШаблон:SubPMeШаблон:Sub)Шаблон:Sub, dmpe is used as a compact strongly basic spectator ligand (Me = methyl), Representative complexes include V(dmpe)Шаблон:Sub(BHШаблон:Sub)Шаблон:Sub, Mn(dmpe)Шаблон:Sub(AlHШаблон:Sub)Шаблон:Sub, Tc(dmpe)Шаблон:Sub(CO)Шаблон:SubCl, and Ni(dmpe)ClШаблон:Sub.[1]
Synthesis
It is synthesised by the reaction of methylmagnesium iodide with 1,2-bis(dichlorophosphino)ethane:[2]
- ClШаблон:SubPCHШаблон:SubCHШаблон:SubPClШаблон:Sub + 4 MeMgI → MeШаблон:SubPCHШаблон:SubCHШаблон:SubPMeШаблон:Sub + 4 MgICl
Alternatively it can be generated by alkylation of sodium dimethylphosphide.
The synthesis of dmpe from thiophosphoryl chloride has led to serious accidents and has been abandoned.[3]
Related ligands
- Bis(dicyclohexylphosphino)ethane, a bulkier analogue, which is also a solid.
- 1,2-Bis(diphenylphosphino)ethane, more air-stable than dmpe, but less basic.
- 1,2-Bis(dimethylphosphino)benzene, a more rigid analogue of dmpe.
- Tetramethylethylenediamine, the diamine analogue of dmpe.
References
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