What you are given
- NMR solvent: Chloroform-d
- Observed δ (ppm): 1.56
Formula: nearest tabulated δ in the chosen solvent
Physical
How do you calculate nMR impurity finder?
Identify a 1H peak from its shift, or look up where a known compound appears (Fulmer table). The relationship used is nearest tabulated δ in the chosen solvent.
Worked example
Every number below is computed by the calculator, not typed in
The working
- Solvent:
Chloroform-d=CDCl3 - Observed:
δ=1.56 ppm - Window:
± tolerance=0.1 ppm - Matches:
within window=1
Most likely: Water (H2O / HDO) (OH, δ 1.56, Δ 0)
Do it with your own numbers.
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