Part II. count the expected number of signals in the 1H-NMR spectrum of these compoundsHO0одев*Cl-cl"D"

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Answered: Part II. count the expected number of…

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL3: Carbon (13c) Nmr Spectroscopy

Section: Chapter Questions

Problem 20CTQ

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3-Bromo-1-phenyl-1-propene shows a complex NMR spectrum in which the vinylic proton at C2 is coupled with both the C1 vinylic proton (J = 16 Hz) and the C3 methylene protons (J = 8 Hz). Draw a tree diagram for the C2 proton signal, and account for the fact that a five-line multiplet is observed.
The following 1H NMR peaks were recorded on a spectrometer operating at 200 MHz. Convert each into Î´ units. (a) CHCl3; 1454 Hz (b) CH3Cl; 610 Hz (c) CH3OH; 693 Hz (d) CH2Cl2; 1060 Hz
The mass spectrum and 13C NMR spectrum of a hydrocarbon are shown. Propose a structure for this hydrocarbon, and explain the spectral data.
Following are two constitutional isomers with the molecular formula C4H8O2. (a) Predict the number of signals in the 1H-NMR spectrum of each isomer. (b) Predict the ratio of areas of the signals in each spectrum. (c) Show how you can distinguish between these isomers on the basis of chemical shift.
Following is the mass spectrum of an unknown compound. The two highest peaks are at m/z 120 and 122. Suggest a structure for this compound. (Data from http://webbook.nist.gov/chemistry/.)
a. How many signals are in its 13C NMR spectrum?b. Which signal is at the lowest frequency?
Part E How many signals are in its 13C NMR spectrum? H3C H_CH3 Br Express your answer as an integer.
Predict the number of signals expected in the 'H-NMR spectrum. 1 B 2 C 3 D 4 E A
May you please help me with this ochem question?
Two bottles labelled cis-cyclohexandiol were found in a laboratory. Because of their differing melting points, the bottles clearly contained two different cis-cyclohexandiol isomers. To determine which isomer was in which bottle, the chemist decided to run ¹3C NMR spectra on a sample of each. The three possible products were as in the figure. (Figure 1) The two ¹³C NMR proton-decoupled spectra contained the following data: ● ● Figure HO spectrum of sample in bottle A: 20.20, 62.55 spectrum of sample in bottle B: 16.09, 29.52, 36.15, 63.08 OH OH OH 1 of 1 OH OH Part A Identify which isomer was present in the bottle A. OH HO OH OH OH OH
7. Which of the molecules below correspond to which of the 'H NMR spectra? Explain your choice. Note that in both spectra below, the peaks are singlets of 3H or 9H. FUX 18 # 3H A Denting 3 10 9 8 7 6 5 4 OCH 3 4 +2 9H 1 1 B J 3H Cada 3 2 7 6 5 4 10 9 8 7 9H 1
a. How many signals are in its 13C NMR spectrum?b. Which signal is at the lowest frequency? CH2=CHBr

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Part II. count the expected number of signals in the 1H-NMR spectrum of these compounds HO 0 одев * Cl -cl "D"