The structure of compound of given molecular formula C 7 H 12 O 2 to be predicted using 13 CNMR spectra. Concept introduction: The 13 CNMR spectrum gives information on the different electronic environments of carbon. As like 1 HNMR, the number of signals generated in 13 CNMR are predicted by performing symmetry operations (rotation or reflection symmetry). Only chemical shift values are reported in the spectrum but not the multiplicity and integration values because the coupling between two neighboring 13 C- 13 C nuclei are weakly involved due to the low abundance of 13 C isotopes of carbon atom. To Identify: The structure of given molecular formula C 7 H 12 O 2 . Broadband-decoupled 13 CNMR spectrum: The spectra provide information regarding the total number of carbon environments. DEPT (Distortionless enhancement by polarization transfer): a) DEPT-90: The spectrum exhibits signal only from CH group and no signals from CH 3 , CH 2 , CH and quaternary carbon (carbon with no protons). b) DEPT-135: The spectrum exhibits CH 3 groups and CH groups as positive signals (pointing up); CH 2 groups appear as negative signals (pointing down) and quaternary carbon does not appear. The signals appear in each type of spectrum:

Question

Want to see the full answer?

Answer 1

Question

Chapter 13.12, Problem 21P

Interpretation Introduction

Interpretation:

The structure of compound of given molecular formula C₇H₁₂O₂ to be predicted using ¹³CNMR spectra.

Concept introduction:

The ¹³CNMR spectrum gives information on the different electronic environments of carbon. As like ¹HNMR, the number of signals generated in ¹³CNMR are predicted by performing symmetry operations (rotation or reflection symmetry). Only chemical shift values are reported in the spectrum but not the multiplicity and integration values because the coupling between two neighboring ¹³C-¹³ C nuclei are weakly involved due to the low abundance of ¹³C isotopes of carbon atom.

To Identify:

The structure of given molecular formula C₇H₁₂O₂.

Broadband-decoupled ¹³CNMR spectrum:

The spectra provide information regarding the total number of carbon environments.

DEPT (Distortionless enhancement by polarization transfer):

a) DEPT-90: The spectrum exhibits signal only from CH group and no signals from CH₃, CH₂, CH and quaternary carbon (carbon with no protons).

b) DEPT-135: The spectrum exhibits CH₃ groups and CH groups as positive signals (pointing up); CH₂ groups appear as negative signals (pointing down) and quaternary carbon does not appear.

The signals appear in each type of spectrum:

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction observations conclusions A The reverse of this reaction is always spontaneous but proceeds slower at temperatures below 41. °C. ΔΗ is (pick one) AS is (pick one) ΔΗ is (pick one) B This reaction is spontaneous except above 94. °C. AS is (pick one) This reaction is always spontaneous, but ΔΗ is (pick one) C proceeds slower at temperatures below −14. °C. AS is (pick one) Х 00. 18 Ar 무ㅎ B 1 1

Draw the product of the reaction shown below. Ignore inorganic byproducts. + H CH3CH2OH HCI Drawing

please explain this in simple terms