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Chapter 14: Q.21558-14-48P (page 563)

Question: How many 13C NMR signals do each compound exhibit?

Short Answer

Expert verified

Answer

a. Five

b. Three

c. Seven

d. Three

e. Seven

f. Five

g. Four

h. Three

Step by step solution

01

Step 1:  13C NMR spectroscopy

13C Spectroscopy gives the high value of chemical shift signal when the carbon-13 is present in the vicinity of the electron-withdrawing groups.

13C Spectroscopy gives the low value of chemical shift signal when the carbon-13 is present in the vicinity of the electron-rich groups.

02

Explanation

The different signals of 13C spectroscopy are represented as:

a.

It has five signals due to the presence of five different 13C .

13C signal

b.

It has three signals due to the presence of three different 13C .

13C signal

c.

It has seven signals due to the presence of seven different 13C .

13C signal

d.

It has three signals due to the presence of three different 13C .

13C signal

e.

It has seven signals due to the presence of seven different 13C .

13C signal

f.

It has five signals due to the presence of five different 13C .

13C signal

g.

It has four signals due to the presence of four different 13C .

13C signal

h.

It has three signals due to the presence of three different 13C

13C signal

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Most popular questions from this chapter

Question: For each compound, first label each different type of proton and then rank the protons in order of increasing chemical shift.

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Question. Treatment of (CH3)2 CHCH2CH(OH)CH2CH3 with TsOH affords two products (M and N) with the molecular formula C6H12 . The 1 H NMR spectra of M and N are given below. Propose structures for M and N, and draw a mechanism to explain their formation.

Question: A compound of molecular formula C4H802 shows no IR peaks at 3600鈥�3200 or 1700 cm-1 . It exhibits one singlet in its 1H NMR spectrum at 3.69 ppm, and one line in its 13C NMR spectrum at 67 ppm. What is the structure of this unknown?

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Question: Explain why the carbonyl carbon of an aldehyde or ketone absorbs farther downfield than the carbonyl carbon of an ester in a 13C NMR spectrum
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