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

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Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter19: Alkenes From Alcohols: Cyclohexene From Cyclohexanol

Section: Chapter Questions

Problem 4Q

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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
None
( which structure fits the best in the given spectra )
Explain when a sample is said to be NMR active or non-NMR active?
Predict the structure of the compound with the following spectra
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
Which compound is correct for the given NMR spectrum? |(3) (2) (2) 2 1 PPM CN 1) 2) 3) Structure 1 O Structure 2 Structure 3
Using a 300 MHz NMR instrument:a.) How many Hz downfield from TMS is a signal at 2.5 ppm?b.) If a signal comes at 1200 Hz downfield from TMS, at what ppm does itoccur?c.) If two signals are separated by 2 ppm, how many Hz does thiscorrespond to?

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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