What are some common chemical shift ranges in #C^13 NMR# spectrum?

Answer 1

See below.

The common broad ranges are:

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

Each of these ranges is further subdivided. For example,

160-220 ppm Range

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

10-90 ppm Range

  • #50-90color(white)(X)"RCH"_2"O"#
  • #30-60color(white)(X)"RCH"_2"Cl"#
  • #25-35color(white)(X)"R"_3"CH"#
  • #16-25color(white)(X)"RCH"_2"R"#
  • #10-15color(white)(X)"RCH"_3#

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

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

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Answer 2

Some common chemical shift ranges in (^{13}\text{C}) NMR spectrum are:

  • Alkyl carbons: (0-50) ppm
  • Alkenyl and alkynyl carbons: (50-90) ppm
  • Aromatic carbons: (100-150) ppm
  • Carbonyl carbons: (160-220) ppm
  • Carboxylic acids and esters: (160-180) ppm
  • Amides: (160-180) ppm
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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