Instant Notes: Analytical Chemistry

Apart from the CH 3 carbon at 22 d/ppm, the remaining carbon-13 resonances

in 3-hydroxy methylbenzene(Fig. 11) are all in the unsaturated region between

100 and 160 d/ppm. The3-carbonis deshielded more than the remainder, being

bonded directly to oxygen, but the chemical shifts of the remainder reflect the

variations in electron density around the ring.

E13 – NMRS: interpretation of proton and carbon-13 spectra 269

d (ppm)

190180170160150140130120110100 90 80 70 60 50 40 30 20 10 0

OH

aCH 3

a

b c f c g b

e

d

d

e

f

g

Fig. 11.^13 C spectrum of 3-hydroxymethylbenzene.