J. Coxon, J. Cambridge, S. G. Nam
Jul 1, 2004
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Journal
Synlett
Abstract
The prochiral H S and H R of the N-(4-nitrophenylsulfonyl)-L-phenylalanyl ester of 2-phenyl, 2-p-methylphenyl- and 2-m-methoxyphenyl-ethan-1-ol are differentiated and defined in the 1 H NMR spectrum by shift studies with ytterbium d-3-heptafluorobutyrylcamphorate. In each case, 4a-c, H S is more sensitive than H R to the addition of the shift reagent.