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5. The 'H NMR spectrum of 2-bromo-1-ethoxy-4-nitrobenzene is shown below, and the peak list has been...
Shown below is the peak list of chemical shifts, multiplicities, numbers of protons (from integration), and...
Shown below is the peak list of chemical shifts, multiplicities,
numbers of protons (from integration), and coupling constants for
the 1H NMR spectrum in Question 4.
a) Draw the chemical structure of trans-4-nitrochalcone. Circle
the proton or protons that you would attempt to identify in the 1H
NMR spectrum as evidence that the expected trans-isomer was formed
(rather than the cis-isomer).
b) Identify the peak or peaks in the peak list that
correspond(s) to the proton or protons circled in...
8. The structure and proton NMR spectrum of a molecule are shown below. The molecule has...
8. The structure and proton NMR spectrum of a molecule are shown below. The molecule has letters by each location that has one or more protons. The chemical shifts of the signals in the spectrum are listed at right with Roman numerals. On your answer page write the Roman numeral of the chemical shift of each family on the line by that family's letta B. - A. sicer Fam., Chemical shift (ppm) 4.2 II 3.5 III 2.75 IV V 1.15...
PART 2 Draw the most accurate 'H-NMR spectrum you can for the following molecules. Show all...
PART 2 Draw the most accurate 'H-NMR spectrum you can for the following molecules. Show all signals including an accurate representation of splitting, intensity and position. Assume no signal overlap (i.e. if you expect signals have similar chemical shifts, just place them next to each other). Clearly label the integration value for each signal. Indicate the correlation between each proton (HA, HB, etc) and each signal (label signals A, B, etc.) ppm 12.5 10 11 O ppm 12.5 10 ii...
5) Provide the structure of the molecule. Proton NMR spectrum is shown below. C,H,CIO 2 e...
5) Provide the structure of the molecule. Proton NMR spectrum is shown below. C,H,CIO 2 e PPM 160.140. 120. 100 80 . 60 40 20
1. Signal Assignment. Below are a set of ranges where a specific H' NMR signal might...
1. Signal Assignment. Below are a set of ranges where a specific H' NMR signal might be found. 0.5-2.0ppm 2.0-3.0ppm 3.0-5.Oppm 0.5-6.Oppm 5.0-7.0ppm 7.0-8.Oppm 9.0-10.0ppm 10.0-12.0ppm Assign to the slots above where the following highlighted protons might be found. a) CH3-CH2- b) CH-CH2-CH2- c) HC-0 d) H-C(O)-R e) H-O-R ) H-O-C(O)-R g) H;C-Ar h ) H-C-C- j) CH3-CEC ...some groups appear in the same ppm range. [2pts each group correctly assigned) 2. Signal Splitting. Decide what splitting pattern (singlet, doublet,...
1- 2- 3- Problem 21 Part A 1-Propanol has the H NMR spectrum shown below. Map...
1-
2-
3-
Problem 21 Part A 1-Propanol has the H NMR spectrum shown below. Map each hydrogen atom in the molecule of 1-propanol with its corresponding peak number. Hint: Draw all hydrogen atoms OHz 50Hz OHz 50Hz OHz 50Hz 3 4 1.6d 1.5d L0d 0.9d 3.6d 3.5d 2 10 8 4 d (ppm) Draw the molecule on the canvas by choosing buttons from the Tools (for bonds and charges), Atoms, and Templates toolbars. Identify the appropriate hydrogen atoms by...
Shown below is the peak list of chemical shifts, multiplicities,
numbers of protons (from integration), and coupling constants for
the 1H NMR spectrum in Question 4.
a) Draw the chemical structure of trans-4-nitrochalcone. Circle
the proton or protons that you would attempt to identify in the 1H
NMR spectrum as evidence that the expected trans-isomer was formed
(rather than the cis-isomer).
b) Identify the peak or peaks in the peak list that
correspond(s) to the proton or protons circled in...
8. The structure and proton NMR spectrum of a molecule are shown below. The molecule has letters by each location that has one or more protons. The chemical shifts of the signals in the spectrum are listed at right with Roman numerals. On your answer page write the Roman numeral of the chemical shift of each family on the line by that family's letta B. - A. sicer Fam., Chemical shift (ppm) 4.2 II 3.5 III 2.75 IV V 1.15...
PART 2 Draw the most accurate 'H-NMR spectrum you can for the following molecules. Show all signals including an accurate representation of splitting, intensity and position. Assume no signal overlap (i.e. if you expect signals have similar chemical shifts, just place them next to each other). Clearly label the integration value for each signal. Indicate the correlation between each proton (HA, HB, etc) and each signal (label signals A, B, etc.) ppm 12.5 10 11 O ppm 12.5 10 ii...
5) Provide the structure of the molecule. Proton NMR spectrum is shown below. C,H,CIO 2 e PPM 160.140. 120. 100 80 . 60 40 20
1. Signal Assignment. Below are a set of ranges where a specific H' NMR signal might be found. 0.5-2.0ppm 2.0-3.0ppm 3.0-5.Oppm 0.5-6.Oppm 5.0-7.0ppm 7.0-8.Oppm 9.0-10.0ppm 10.0-12.0ppm Assign to the slots above where the following highlighted protons might be found. a) CH3-CH2- b) CH-CH2-CH2- c) HC-0 d) H-C(O)-R e) H-O-R ) H-O-C(O)-R g) H;C-Ar h ) H-C-C- j) CH3-CEC ...some groups appear in the same ppm range. [2pts each group correctly assigned) 2. Signal Splitting. Decide what splitting pattern (singlet, doublet,...
1-
2-
3-
Problem 21 Part A 1-Propanol has the H NMR spectrum shown below. Map each hydrogen atom in the molecule of 1-propanol with its corresponding peak number. Hint: Draw all hydrogen atoms OHz 50Hz OHz 50Hz OHz 50Hz 3 4 1.6d 1.5d L0d 0.9d 3.6d 3.5d 2 10 8 4 d (ppm) Draw the molecule on the canvas by choosing buttons from the Tools (for bonds and charges), Atoms, and Templates toolbars. Identify the appropriate hydrogen atoms by...
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