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Diphosphines are a class of compounds used as ligands in inorganic and organometallic chemistry. They are identified by the presence of two phosphine ligands joined by a backbone, and are usually chelating.
Additional recommended knowledge
The most widely used diphosphine ligands are the bis(diphenylphosphino)alkanes, Ph2P(CH2)nPPh2. These can be prepared from X(CH2)nX (X=halogen) and YPPh2 (Y=alkali metal) in THF . Bidentate phosphines with only one bridging group such as dppm tend to promote metal-metal interaction or bond formation because the two donor P atoms are so close together. The use of chelate phosphines with many bridging groups giving long flexible chains has quite a different effect. For example, the chelate phosphine Bu2tP(CH2)10PBu2t can give complexes that have as many as 72 atoms in a ring .
While there can be very many diphosphine ligands possible, there are some which are commonly used, and which are commercially available. These include:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Diphosphines". A list of authors is available in Wikipedia.|