Instant Notes: Analytical Chemistry

The CH 2 protons in propanamide(Fig. 7) are deshielded by the adjacent

carbonyl group and couple with the CH 3 protons to give an A 2 X 3 quartet and

triplet. The resonance of the amine protons at 6.4 d/ppm is broadened by

proton-proton exchange and could be removed by shaking with D 2 O. The inte-

gral ratios are 2:2:3.

266 Section E – Spectrometric techniques

600 500 400 300 200

(Hz)

100 0

d (ppm)

10 9 8 7 6 5 4 3 2 1 0

Solvent: CDCl 3

CH 3 CH 2 CONH 2

Fig. 7.^1 H spectrum of propanamide.

500 400 300 200

(Hz)

100 0

8.0 7.0 6.0 5.0 4.0

d (ppm)

3.0 2.0 1.0 0

CH 2 CH 2 OCH 3

C

O

(b)

(b)

(c)

(c)

(a)

(a)

(d)

(d)

Fig. 6.^1 H spectrum of phenylethyl ethanoate.