(2R,3R)‐2,3‐Bis(diphenylphosphino)butane

(2R,3R) [74839-84-2] C28H28P2 (MW 426.48) InChI = 1S/C28H28P2/c1-23(29(25-15-7-3-8-16-25)26-17-9-4-10-18-26)24(2)30(27-19-11-5-12-20-27)28-21-13-6-14-22-28/h3-24H,1-2H3/t23-,24-/m0/s1 InChIKey = FWXAUDSWDBGCMN-ZEQRLZLVSA-N (2S,3S) [64896-28-2] InChI = 1S/C28H28P2/c1-23(29(25-15-7-3-8-16-25)26-17-9-4-10-18-26)24(2)30(27-19-11-5-12-20-27)28-21-13-6-14-22-28/h3-24H,1-2H3/t23-,24-/m1/s1 InChIKey = FWXAUDSWDBGCMN-DNQXCXABSA-N (ligand for asymmetric hydrogenation of alkenes2 and β-keto esters;3 allylic alkylation;4 hydroarylation5) Alternate Name: (R,R)-CHIRAPHOS. Physical Data: mp 107–109 °C; [α]D20 +195° (c = 1.5, CHCl3). Form Supplied in: white solid; widely available. Handling, Storage, and Precautions: is indefinitely stable in air in the solid state. Solutions of CHIRAPHOS are readily oxidized to the phosphine oxide and should be handled under N2 or Ar.2