Quantitatively Correlating the Effect of Ligand-Substituent Size in Asymmetric Catalysis Using Linear Free Energy Relationships
作者:Jeremie J. Miller、Matthew S. Sigman
DOI:10.1002/anie.200704257
日期:2008.1.11
Examination of the Role of Taft-Type Steric Parameters in Asymmetric Catalysis
作者:Matthew S. Sigman、Jeremie J. Miller
DOI:10.1021/jo901698t
日期:2009.10.16
We report the use of Taft steric parameters to correlate the substituent size of a ligand with the enantiomeric ratio of a reaction. Linear free energy relationships can be constructed by plotting the log of enantiomeric ratio (er) versus the steric parameters reported by Taft and modified by Charton. Successful correlations were found for aldehyde and ketone allylation under NHK conditions using modular