Journal of Organometallic Chemistry p. 239 - 248 (1980)
Update date:2022-08-24
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Ojima, Iwao
Kogure, Tetsuo
Asymmetric hydrogenations of n-propyl pyruvate and ketopantoyl lactone catalyzed by rhodium complexes with (-) DIOP and BPPM were carried out under a variety of conditions.It was found that i) the Schrock-Osborn mechanism was not operative in these reactions at all since no acceleration of the reaction rate by the addition of water (1percent) was observed, ii) there was a clear difference between cationic and neutral (in situ) rhodium catalysts in their enantioslectivity, and iii) there was a remarkable solvent effect on the extent and direction of asymmetric induction.Possible mechanisms are discussed on the basis of these results.
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