The structure of an alcohol of given molecular formula C 4 H 10 O 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 an alcohol of given molecular formula C 8 H 16 O. 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

22

Answer 1

Question

Chapter 13.12, Problem 20P

Interpretation Introduction

Interpretation:

The structure of an alcohol of given molecular formula C₄H₁₀O 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 an alcohol of given molecular formula C₈H₁₆O.

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

Trending nowThis is a popular solution!

See solution

Check out sample textbook solution

Students have asked these similar questions

22

PLEASE READ!!! I DONT WANT EXAMPLES, I DONT WANT WORDS OR PARAGRAPHS FOR THE MECHANISM!!! THANKS First image: QUESTION 6. I have to show, with ARROWS and STRUCTURES, the mechanism of the reaction at the bottom. Also I have to show by mecanism why the reaction wouldn't work if the alcohol was primary. I also tried to draw the mechanism, tell me what to change. Please note that its an AMIDE thats formed not an AMINE the nitrogen has ONE hydrogen and one Phenyl-C-Phenyl. I already asked for this mechanism and got as a final product ...-NH2 not whats shown on the picture, thank you Ths second part. QUESTION 3. I just need a way to synthesize the lactone A, I already started please continue from where I left it Second image: I simply need the products, substrates or reagents, thank you

Indicate how to prepare a 10% sodium hydroxide (NaOH) solution to a slightly alkaline pH.