A new optically active diphosphine ligand, [(5,6),(5‘,6‘)-bis(ethylenedioxy)biphenyl-2,2‘-diyl]bis(diphenylphosphine) (SYNPHOS) has been synthesized. Laboratory-scale synthesis and scale-up development of this ligand are described herein. This new atropisomeric diphosphine was also used in ruthenium-catalyzed asymmetric hydrogenation.
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Paule et al. (2003) studied this question.
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