Formation of solvate dihydrides

By comparing the results of H- H and 3ip-3ip 2D EXSY spectra, it was possible to conclude that 28a and 28b can interconvert without the 

Similar observations of reversible formation of solvate dihydrides were made for other BisP -Rh complexes, for the TangPhos-Rh com-plex, and for the PHANEPhos-Rh complex.  

The examples of direct observation of solvate dihydrides together with the computational data collected in the Table 1.1 illustrate the fact that these species are kinetically competent intermediates in the catalytic cycle of Rh-catalyzed asymmetric hydrogenation. 

---

Formation of solvate dihydrides Experimentally formation of solvate dihydrides has been observed for several Rh-diphosphine catalysts. Thus, two diastereomeric dihydrides 28a, b were obtain via the reversible oxidahve addition of H2 to the solvate complex [Rh(f-Bu-BisP )(CD30D)2]+ (27) and have been characterized by NMR (Scheme 1.9). 

Scheme 1.12 Irreversible formation of solvate dihydrides. (Gridnev, I. D. and Imamoto, T., Chem. Commun., 7447-7464, 2009. Reproduced by permission of The Royal Society of Chemistry.)...

---