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Diphosphines, sometimes called bisphosphanes, are organophosphorus compounds used as ligands in inorganic and organometallic chemistry. They are identified by the presence of two phosphino groups linked by a backbone, and are usually chelating.〔Hartwig, J. F. Organotransition Metal Chemistry, from Bonding to Catalysis; University Science Books: New York, 2010. ISBN 189138953X〕 ==Synthesis== Many widely used diphosphine ligands have the general formula Ar2P(CH2)nPAr2. These compounds can be prepared from the reaction of X(CH2)nX (X=halogen) and MPPh2 (M = alkali metal):〔Wilkinson, G.; Gillard, R.; McCleverty, J. ''Comprehensive Coordination Chemistry: The synthesis, reactions, properties & applications of coordination compounds'', vol.2.; Pergamon Press: Oxford, UK, 1987; p. 993. ISBN 0-08-035945-0 〕 :Cl(CH2)nCl + 2 NaPPh2 → Ph2P(CH2)nPPh2 + 2 NaCl Diphosphine ligands can also be prepared by other methods, such as from dilithiated reagents and chlorophosphines:〔Gareth J. Rowlands "Planar Chiral Phosphines Derived from ()Paracyclophane" Israel Journal of Chemistry 2012, Volume 52, Issue 1-2, pages 60–75.〕 :XLi2 + 2 ClPAr2 → X(PAr2)2 + 2 LiCl (X = hydrocarbon backbone) Another popular method involves the addition of secondary phosphines to vinylphosphines: :Ph2PH + 2 CH2=CHPAr2 → Ph2PCH2-CH2PAr2 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Diphosphines」の詳細全文を読む スポンサード リンク
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