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CASA: New Chiral NMR Shift Reagents
No.181(August 2019)
- C3671
- (R,R)-CASA-H (1)
- C3672
- (S,S)-CASA-H (2)
- C3673
- (R,R)-CASA-Na (3)
- C3674
- (S,S)-CASA-Na (4)
CASAs (1-4) are chiral hexa-dentate aluminum complexes usable as chiral shift reagents. When a mixture of a substrate and CASA are measured in NMR, the chemical shifts of the protons adjacent to oxygen and nitrogen functions are shifted, there by resolving the peaks of the two enantiomers present. Furthermore, CASAs are applicable to both polar and non-polar deuterated solvents.
(Measured at TCI, 400 MHz, CD3OD, racemic, S form, R form on right)
These products were produced by collaboration with Prof. Hyunwoo Kim, Korea Advanced Institute of Science and Technology (KAIST).
References
- 1) 1H NMR Chiral Analysis of Charged Molecules via Ion Pairing with Aluminum Complexes
- 2) A chiral aluminum solvating agent (CASA) for 1H NMR chiral analysis of alcohols at low temperature
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