Citation: Jian Wei ZHANG, Ji Yu GUO, Xiao Tian LIANG, Mu Jian LU. The Fallacy of Using Chiral Shift Reagents to Differentiate d，l and meso Isomers[J]. Chinese Chemical Letters, ;1996, 7(11): 1003-1004. shu

The Fallacy of Using Chiral Shift Reagents to Differentiate d，l and meso Isomers

a Institute of Materia Medica Chinese Academy of Medical Sciences & Peking Union MedicalCollege Beijing 100050;
b Depanment of Chemistry Peking Universty University Beijing 100871

Received Date: 22 April 1996

A d,l mixture(R-R and S-S)can be resolved into the d and the I enantiomers.while the meso isomer(R-S,identical with S-R)cannot be physically separated.This fact has occasionally been "extrapolated" to differentiate d,I and meso isomers with a chiral shift reagent,where the meso isomer is presumed not to show any signal "doubling" during the(usually)downfield shift.This assumption has been shown to be incorrect by the behavior of a meso molecule which does give signal "doubling".
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