1. Consider this compound: b) c) Label A B JOH CH₂ CH3 How many signals would this compound give in the 'NMR? You may group aromatic hydrogens together as one signal. On the structure above, label the different types of H's as A, B, C, etc. In table form, list the peaks, the number of hydrogens, their shifts, and the splitting you would observe in the 'NMR spectrum of this compound, for example: # of hydrogens 3 etc. Shift (8) 2.0 splitting singlet

1. Consider this compound: b) c) Label A B JOH CH₂ CH3 How many signals would this compound give in the 'NMR? You may group aromatic hydrogens together as one signal. On the structure above, label the different types of H's as A, B, C, etc. In table form, list the peaks, the number of hydrogens, their shifts, and the splitting you would observe in the 'NMR spectrum of this compound, for example: # of hydrogens 3 etc. Shift (8) 2.0 splitting singlet

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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1. Consider this compound: GH3 CH b) c) Label A B How many signals would this compound give in the 'NMR? You may group aromatic hydrogens together as one signal. On the structure above, label the different types of H's as A, B, C, etc. In table form, list the peaks, the number of hydrogens, their shifts, and the splitting you would observe in the 'NMR spectrum of this compound, for example: #of hydrogens 3 etc. Shift (8) 2.0 splitting singlet
3b. Assign the correct signal in the 1H NMR spectrum for each proton signal in the following compound. Label the signal as Ha, Hb, Hc and Hd and name all the splitting patterns.
Sketch the expected 1H NMR considering the suitable relative sizes of the signals to account for the differences in the # of proton producing them.
(3) These natural compounds will have different numbers of 1H-NMR signals in different NMR solvents like CDC13 and methanol-d4. How many signals do you anticipate for each compound respectively in CDC13 and methanol-d4? LOCH 3 OHC. vanillin OH LOH acetoaminophen HO thymol
Provide the chemical shifts, integration (or ratio), and multiplicity for the signals in the 1H NMRspectrum and draw the expected 1H NMR spectrum for each of the following compounds:
5. Dibromomethane contains 2 equivalent protons, so just one signal on the H NMR spectrum for dibramomethane is expected to be seen. determine the expected chemical shift for the dibromomethane signal.
Explain why 2-chloropropene shows signals for three kinds of protons in its 1H NMRspectrum? Draw the structure and predict the approximate values for 1H-NMR spectra.
How many signals do you expect from the proton NMR spectrum of the compound shown? (write the answer as a suitable number only like 1,2,3,4,5, etc.)
1) Propose the structures for the following 1H and 13C NMR spectrum. b) Molecular Formula: C8H8O3 1H-NMR, CDCl3 Solvent, Molecular Formula: C8H8O3 13C-NMR, CDCl3 Solvent, Molecular Formula: C8H8O3 in the pictures
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
a) Make a table of the chemical shift, multiplicity and number of hydrogens for each 1H-NMR signal. b) Propose a structure consistent with the data and assign each proton in your structure to a signal in the NMR spectrum.
Below are the ¹H NMR spectrum of triphenylmethanol, benzophenone, and bromobenzene. Identify the compound corresponding to each ¹H NMR spectrum and draw the structure next to the ¹H NMR spectrum. Assign ALL peaks in each of the three ¹H NMR spectra. Hint: Conjugated systems (benzophenone) including an electronegative atom will cause a more downfield shift of ring protons in ¹H NMR compared with non-conjugated systems (bromobenzene). 8 8 8 7 7 7 6 6 6 5 5 5 4 PPM 4 PPM 4 PPM 3 3 3 2 2 2 1 1 1 0 0 0