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What are some common chemical shift ranges in $C^{13} N M R$ $C^13 NMR$ spectrum?

1 Answer

Nov 8, 2015

See below.

Explanation:

The common broad ranges are:

$160 - 220 X C=O$ $160-220 color(white)(X)"C=O"$
$115 - 150 X C=C, C\equivN$ $115-150color(white)(X)"C=C, C≡N"$
$10 - 90 X X Alkane C$ $10-90color(white)(XX)"Alkane C"$

Each of these ranges is further subdivided. For example,

160-220 ppm Range

$205 - 220 X RCOR$ $205-220 color(white)(X)"RCOR"$
$190 - 200 X RCHO$ $190-200 color(white)(X)"RCHO"$
$160 - 185 X RCOOH, RCOOR$ $160-185 color(white)(X)"RCOOH, RCOOR"$

10-90 ppm Range

$50 - 90 X {RCH}_{2} O$ $50-90color(white)(X)"RCH"_2"O"$
$30 - 60 X {RCH}_{2} Cl$ $30-60color(white)(X)"RCH"_2"Cl"$
$25 - 35 X R_{3} CH$ $25-35color(white)(X)"R"_3"CH"$
$16 - 25 X {RCH}_{2} R$ $16-25color(white)(X)"RCH"_2"R"$
$10 - 15 X {RCH}_{3}$ $10-15color(white)(X)"RCH"_3$

These ranges are often presented in a chart like the one below.

chemwiki.ucdavis.edu

Even this limited information might enable you to match the carbon atoms to their corresponding peaks in the NMR spectrum of methyl methacrylate.

chemwiki.ucdavis.edu

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