1,2-Bis(diphenylphosphino)ethane
1,2-Bis(diphenylphosphino)ethane (dppe) is a commonly used bidentate ligand in coordination chemistry. Dppe is almost invariably chelating, although there are examples of unidentate (e.g., W(CO)5(dppe)) and of bridging behavior.
Preparation
The preparation of dppe is conducted via the alkylation of NaPPh2 which is typically prepared from triphenylphosphine (P(C6H5)3) as follows:
NaP(C6H5)2, which is readily air-oxidized, is treated with 1,2-dichloroethane (ClCH2CH2Cl) to give dppe:
Reactions
Reduction
The reduction of dppe by lithium to give PhHP(CH2)2PHPh has been reported.
Hydrolysis by water gives:
Oxidation
Treatment of dppe with conventional oxidants such as hydrogen peroxide (H2O2), aqueous bromine (Br2), etc., always produces dppeO in low yield (e.g., 13%) as a result of non-selective oxidation leading to mixtures of the starting material, the monoxide, and dioxide. Selective mono-oxidation of dppe can be achieved by reaction with PhCH2Br to give dppeO.
This is followed by purification and alkaline catalyzed hydrolysis of the mono-phosphonium salt.
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