Carbon NMR Prediction Tool
Predict 13C NMR chemical shifts and carbon environments for organic structure analysis. Use this reference guide to understand chemical shift ranges, common environments, and the evidence students combine before assigning an NMR spectrum.
Use the Shift Ranges First
Until the predictor launches, compare the table below with your spectrum and combine chemical shift, integration, splitting, and molecular formula.
What the 13C NMR predictor will show
The live tool will estimate carbon environments, broadband-decoupled peak positions, symmetry-equivalent carbons, and carbonyl/sp2/sp3 assignments.
Reference Scope
The reference material focuses on compound name, formula, SMILES, solvent, instrument frequency, and NMR type because those details affect chemical shift interpretation.
Common Carbon NMR Shift Ranges
| Environment | Typical Range | Notes |
|---|---|---|
| Alkyl C | 0-50 ppm | sp3 carbon region |
| C-O / C-N | 50-90 ppm | heteroatom-substituted carbon |
| Alkyne C | 65-90 ppm | sp carbon region |
| Alkene / aromatic C | 100-150 ppm | sp2 carbon environments |
| Carbonyl C | 160-220 ppm | esters, acids, aldehydes, ketones |
How Carbon NMR Prediction Will Work
The planned workflow is simple: enter a compound name, formula, or SMILES string, choose the NMR experiment settings, and receive an annotated prediction. The final tool will include likely peaks, environment labels, and explanations that help students connect spectra to structure.
Until the live prediction model is released, use the reference ranges above to estimate where common organic environments appear. Real spectra may shift with solvent, concentration, hydrogen bonding, conjugation, stereochemistry, and instrument conditions.