H-NMR Flashcards Preview

Organic Chemistry Lab > H-NMR > Flashcards

Flashcards in H-NMR Deck (11)
Loading flashcards...
1

H on a Phenol

About 4-7 ppm

2

Benzyl Proton

About 6.5-8

3

Ketone hydrogen

9-10 ppm

4

Carboxylic Acid Hydrogen

10-12 ppm

5

Amide Hydrogens

5-8 ppm

6

Methyl Proton

0.85 ppm

7

Methylene Proton

1.20 ppm

8

Methine Proton

1.55 ppm

9

Enantiotopic Hydrogens

When a carbon is bonded to two H's and two nonequivalent groups, the H's are enantiotopic.
They are chemically equivalent so they show up as ONE signal on the NMR.

10

Diastereotopic Hydrogens

When a carbon bound to an asymmetric center is also bound to two H's, the H's are diastereotopic.
The H's are NOT chemically equivalent so they will show up as TWO signals in the NMR

11

J (coupling constant)

The distance between adjacent peaks. The magnitude is an indication as to how strongly the nuclear spin of the protons effect each other.
Measured in Hz