27. NO AI USE Predict the number of signals in the expected 13C NMR spectrum of the followingcompound:Hint: consider multiple planes of symmetry4 (four)Carbon Signals5 (five)Carbon Signals6 (six)Carbon Signals7 (seven)Carbon SignalsA.B.C.D.ABD

Approach to solving the question: we need to count the number of Carbon atoms with same environment…

Answered: Predict the number of signals in the…

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL3: Carbon (13c) Nmr Spectroscopy

Section: Chapter Questions

Problem 8E

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26. NO AI USE
28. NO AI USE
6. The MS and 13C NMR spectra for two constitutional isomers with 4 degrees of unsaturation are shown below. Please determine the molecular structures of the two constitutional isomers. ISOMER A ISOMER B 100 100- 80 - 80 60 - 60 40 MTS 140 40 20 20- 25 50 75 100 125 25 50 75 100 125 m/z m/z 3 peales tatal , 2 peaks 200 180 160 140 120 100 80 60 40 20 200 180 160 140 120 100 80 60 40 20 COS-00-887 ppm COS-00-886 ppm Relative Intensity Relative Intensity :-
5. Use the 1H-NMR data to determine the structure of the compounds listed below. Indicate which hydrogens are responsible for each signal. a. C2H4C|z: singlet at s 3.7 ppm b. C8H10: § 1.2 ppm (triplet, 3H) § 2.6 ppm (quartet, 2H) § 7.1 ppm (broad singlet, 5H)
How many 1H-NMR signals would you expect to see for the following molecule? Hint: Think about symmetry.
1. Fill in the boxes in the following problem. Hint: The number of NMR peaks tells you about the symmetry of the molecule. 1¹H peak HCI A C4H8 Cl₂ 2 ¹H peaks
What is the expected multiplicity of the indicated carbon atoms in a proton-coupled ¹3C NMR spectrum? b a C H a Choose... d Choose... с Choose... b Choose... d
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Magnetically equivalent protons give a single signal in 1H-NMR. How many signals will be observed in the 1H-NMR spectrum of the compound in the figure? (TO). 4 (B). 6C). 8 (D). 10 CH3
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The structure of a molecule is shown below. The fluorines are diastereotopic. F. CM23 Me CI Br i) Sketch the H NMR spectrum of the molecule. You must annotate your spectra with "Jxy notation and suggest approximate chemical shifts. ii) Sketch the 19F NMR spectrum of the molecule. You must annotate your spectra with "Jxy notation.

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Predict the number of signals in the expected 13C NMR spectrum of the following compound: Hint: consider multiple planes of symmetry 4 (four) Carbon Signals 5 (five) Carbon Signals 6 (six) Carbon Signals 7 (seven) Carbon Signals A. B. C. D. A B D