Addition of a chiral shift reagent to a NMR sample often simplifies complex^1H N

Question

Addition of a chiral shift reagent to a NMR sample often simplifies complex^1H NMR spectrum. How chiral shift reagent simplifies complex^1H NMR spectrum? Un-decoupled^13C NMR and off-resonance^13C NMR reveals the number of hydrogen(s) present on each carbon in a molecule by providing multiplicities of each carbon signal. Is there any other carbon NMR experiment(s) one can carry out that will provide the same information? If the above answer is yes, list the name the experiment(s) and elaborate how the technique(s) work.

Explanation / Answer

4. The shift reagent reduce the shielding of all protons and the shift increase with the proximity of the protons to the shift reagents.

5. (a) APT: Attached Proton Tests (b) DEPT: Distortionless Enhancement by Polarisation Transfer (c) SFORD: Single Frequency Off Resonance Decoupling

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