Physical
NMR impurity finder
Identify a 1H peak from its shift, or look up where a known compound appears (Fulmer table).
nearest tabulated δ in the chosen solvent
Identify mode: the chemical shift of the unexpected peak.
Identify mode: how close a tabulated shift must be to count as a match.
Look-up mode: the compound whose expected shift you want.
Protocol result
⚗ Aliquot
NMR impurity finder · nearest tabulated δ in this solvent · the lab bench, calculated
NMR✓ nearest tabulated δ in this solvent
Most likely: Water (H2O / HDO) (OH, δ 1.56, Δ 0)
1
Matches are advisory; confirm with multiplicity and integration. Shifts are concentration- and temperature-dependent.
| Impurity | Group | Mult | δ (ppm) | Δ |
|---|---|---|---|---|
| Water (H2O / HDO) | OH | s | 1.56 | +0 |
Matches
1
Source
Fulmer 2010