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Chapter 14: Q.21558-14-29P. (page 558)

Esters of chrysanthemic acid are naturally occurring insecticides. How many lines are present in the NMR spectrum of chrysanthemic acid?

Short Answer

Expert verified

The 13C NMR spectrum consists of nine lines.

Step by step solution

01

13C  NMR spectroscopy

The 13C NMR spectroscopy is used to describe the carbon environment of a compound.

The signals in the 13C NMR spectrum give the number of equivalent and non-equivalent carbon atoms which is used to interpret the structure of an unknown compound.

02

Equivalent and non-equivalent carbon atoms

The carbon atoms that have the same chemical environment and that resonate at the same frequency are termed chemically equivalent.

The carbon atoms that have a different chemical environment and that resonate at different frequencies are termed non-equivalent carbon atoms.

03

Number of lines in the 13C NMR spectrum of chrysanthemic acid

Non-equivalent carbon atoms in chrysathemic acid

There are nine non-identical carbon atoms in chrysanthemic acid and hence its 13C NMR spectrum consists of nine signals/lines.

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Most popular questions from this chapter

Question. Treatment of butan-2-one (CH3COCH2CH3) with a strong base followed by CH3l forms a compound Q, which gives a molecular ion in its mass spectrum at 86. The IR (> 1500 only) and 1H-NMR spectrum of Q is given below. What is the structure of Q?

Question: (a) How many 1H NMR signals does each of the following compounds exhibit? (b) How many 13C NMR signals does each compound exhibit?

Rank each group of protons in order of increasing chemical shift.

a.

b.

Into how many peaks will each proton shown in green be split?

a.

b.

c.

d.

e.

f.

For each compound, which of the protons on the highlighted carbons absorbs farther downfield?

a.

b.

c.

See all solutions

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