How to figure out the number of HNMR signals?

organic chemistry tutor NYC

HNMR stands for hydrogen nuclear magnetic resonance. This technique allows us to figure out the structure of many molecules. It is especially useful in pharmaceutical industries for the research in drug discovery.

The number of signals that HNMR gives is equal to the number of different hydrogens.

Two hydrogens are different when they are on carbons attached to different groups.

Here is a set of tips that will allow you to solve the HNMR number of signal problems successfully:

1. First, you must show all the hydrogen to see what you are working with.

2. Look for lines of symmetry. Symmetry can be horizontal, diagonal or vertical. There can be multiple lines of symmetry for the same molecule. When two hydrogens are on opposite sides of the line of symmetry, they are going to give the same signal.

3. Hydrogens in t