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|Section2= }} Cyclooctadiene rhodium chloride dimer is the organorhodium compound with the formula Rh2Cl2(C8H12)2, commonly abbreviated ()2 or Rh2Cl2(COD)2. This yellow-orange, air-stable compound is a widely used precursor to homogeneous catalysts.〔Giordano, G.; Crabtree, R. H. “Di-μ-chloro-bis(η4-1,5-cyclooctadiene)dirhodium(I)” Inorganic Syntheses, 1990, volume 28, pages 88-90. 〕 ==Preparation and reactions== The synthesis of ()2 involves heating a solution of hydrated rhodium trichloride with 1,5-cyclooctadiene in aqueous ethanol in the presence of sodium carbonate:〔 :2 RhCl3.3(H2O) + 2 COD + 2 CH3CH2OH + 2 Na2CO3 → ()2 + 2 CH3CHO + 8 H2O + 2 CO2 + 4 NaCl ()2 is principally used as a source of the electrophile "()+." :()2 + n L → ()+Cl− (where L = PR3, alkene, etc. and n = 2 or 3) In this way, chiral phosphines such as chiraphos, DIPAMP, and DIOP have been attached to Rh. The resulting chiral catalysts are capable of asymmetrically hydrogenating certain prochiral alkenes. A closely related but still more reactive complex is chlorobis(cyclooctene)rhodium dimer. 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「cyclooctadiene rhodium chloride dimer」の詳細全文を読む スポンサード リンク
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