Long-Range Shielding Effects in the <sup>1</sup>H NMR Spectra of Mosher-like Ester Derivatives
作者:Thomas R. Hoye、Sara E. Erickson、Sherrie L. Erickson-Birkedahl、Christopher R. H. Hale、Enver Cagri Izgu、Michael J. Mayer、Patrick K. Notz、Matthew K. Renner
DOI:10.1021/ol1003862
日期:2010.4.16
differences (Δδs) in the two diastereomers of menthyl esters of known chiral derivatizing agents (CDAs) were compared to those of the α-methoxy-α-trifluoromethyl-1-naphthylacetyl (MTN(1)A) analogues I. Discrimination of the terminal diastereotopic methyl resonances in esters of the homologous, symmetrical carbinols II was evaluated. Remarkably, the methyls differed in the MTN(1)A esters III even when