Tetraalkyl analogs of DIOP, (−)-EtDIOP, (−)-i-PrDIOP, and (−)-CyDIOP, have been prepared for the first time by the reaction of (+)-2,3-O-isopropylidene-2, 3-dihydroxy-1,4-difluorobutane and the corresponding lithium dialkylphosphides. These diphosphines form cationic Rh(I) complexes, [Rh{(-)-RDIOP} (NBD)]C104 (R=Et, i-Pr, and Cy), which show remarkable reactivity toward dihydrogen
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Tani et al. (1982) studied this question.
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