Which signal(s) remain(s) when a DEPT-90 spectrum is run? CH CH_2 a, b, c CH_3 W

Question

Which signal(s) remain(s) when a DEPT-90 spectrum is run? CH CH_2 a, b, c CH_3 Which of the following occurs when a DEPT-135 spectrum is run? Carbon signals are absent CH_2, CH carbons appear as positive signals CH_3 carbons appears as a negative signals a and b all of the above Consider the following structure. Atoms other than carbon and hydrogen are labeled. The carbon atoms are designated by numbers. Which carbon atom(s) will produce a signal in a DEPT-90 spectrum? 2 and 5 1, 6 and 7 3 4 All will produce a signal. Consider the following structure. Atoms other than carbon and hydrogen are labeled. The carbon atoms are designated by numbers.

Explanation / Answer

2. The answer is b. CH proton

Distortionless Enhancement by Polarization Transfer. The result of this experiment is a carbon spectrum that shows the multiplicities (methyl, methylene, methine and quaternary) for the different carbons

In DEPT 90 spectra only CH proton was appear.

The DEPT 90 contains only the CH peaks, so subtracting this from the DEPT 45 + DEPT135

combination will give only the CH3 proton

3. Answer is d. All the above

the DEPT 135 spectra where -CH3 and CH peaks appear as a positive peak and -CH2- appear as a negative peaks. Quaternary C are not usually seen. This way the number of H attached to C can usually be deduced

4. the answer is d .4

The DEPT 90 spectra only the CH peaks were appear

  

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