Free interactive chemistry · SIM-SPEC-NMR-002

2D NMR correlation

2D NMR: cross-peaks show which protons are coupled (COSY) and which H is on which C (HSQC).

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How to use this simulation

Choose a compound.
Choose COSY or HSQC.
Tap a peak to read what it tells you.

What to notice

COSY cross-peaks join protons on neighbouring carbons.
HSQC shows one peak for each carbon that carries H.

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Use COSY to trace the carbon chain from one end to the other.

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