Please show all work! Thank you (:
Homework Answers
Solution:
1) The 1H nmr spectrum of 1,4-dimethoxybenzene is given below with multiplicities and integration.
2) Absorbance (A) is calculated as,
A = a c l
Where, a = absorptivity
c = concentration
l = path length
Thus,
a = A / c l = 0.8 / 5 mM x 1 cm
a = 0.8 / 0.005 mol / L x 1 cm
a = 160 mol L-1 cm-1
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Please show all work! Thank you (:
1. Draw the 1H-NMR spectrum of 1,4-dimethoxybenzene. Clearly show...
Please show all work! Thank you :) 1. Draw the 1H-NMR spectrum of 1,4-dimethoxybenzene. Clearly show...
Please show all work! Thank you :)
1. Draw the 1H-NMR spectrum of 1,4-dimethoxybenzene. Clearly show the multiplicity, the relative peak heights, and integration value of each signal in the 1H NMR spectrum. Chemical shifts. 1,4-Dimethoxybenzene: 3.80 (CH3), 6.80 ppm (Ph-H). (35 points) 2. What is the absorptivity of an analyte in a concentration of 5 mM with an absorbance of 0.8 when measured with a 1-cm pathlength cuvette. (25 points)
for the following 2 compounds, please calculate, and show the calculations for, the degree of unsaturation, assign the IR spectrum peaks, assign the 13C NMR peaks, assign the 1H NMR peaks, and draw th...
for the following 2 compounds, please calculate, and
show the calculations for, the degree of unsaturation, assign the
IR spectrum peaks, assign the 13C NMR peaks, assign the 1H NMR
peaks, and draw the structure for the unknown compound.
CHIM 245 Spectroscopy Problem Set #2 In this problem set there are two unknown compounds. You are provided with the formula, IR spectrum, "C NMR spectrum, and 'H NMR spectrum for each compound. Each unknown is worth 10 points, with an...
Construct a simulated 1H NMR spectrum for 2-chloropropane by dragging and dropping the appropriate splitting patterns...
Construct a simulated 1H NMR spectrum for 2-chloropropane by dragging and dropping the appropriate splitting patterns into the boxes on the chemical shift baseline, and by dragging integration values into the small box above each signal. Items may be used more than once. Peak heights do not represent integration. It has signals at 1.5 and about 3.8 ppm
Fill out this table based on the IR spectrum of 1,4-Dimethoxybenzene below. If you show the...
Fill out this table based on the IR spectrum of
1,4-Dimethoxybenzene below. If you show the table clearly, I will
rate :)
Label
Absorbance Max
Relative Intensity
Shape
Functional Group/Hybridization
Considerations,
Comments
% Transmittance 4000 3500 3278.64 3000 3053.06 2952.13 2 2835.57 2500 Wavenumbers (cm-1) 2000 hamid 1629.41 1600.80 1584.97 1500 1507.82 1465.15 1437.46 1406.96 1378.72 1362.85 1324.70 1238.14 1276.50 1215.43 1173.82 1138.65 1111.76 1000 1036.98 958.73 905.49 877.89 813.34 740.84 706.73 639.05 621.60
3) What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C2H, NO and a...
3) What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C2H, NO and a characteristic IR stretch near 1700 cm?? Relative integration is shown. a) Explain the multiplicity and the chemical shift of each signal b) Indicate in each signal how you would calculate the coupling constants (). Give an approximate value (range) for each of the expected J values c) Indicate the 'H coupling showing the above-indicated J values ? PPM
NMR Data: Attach 1H NMR spectrum; draw the Lewis structure and an acceptable name of the...
NMR Data: Attach 1H NMR spectrum; draw the Lewis structure and an acceptable name of the identified compound on the spectrum. Show all bonds to the hydrogens. Label the different sets of hydrogens (i.e. Ha. Hy, H1, H2, etc.). Create a table that summarizes the chemical shift, integration, multiplicity, the proton assignment, and justification of each signal. Phenyl Acetate or Methyl Benzoate "C227 Baeyer-Villiger Reaction" 2 1.0000 0.4998 U.98.39 - M 7.4235 - M 7.2793 - M 7.1626 1 "C:\CHEM...
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...
4. Draw a clear and accurate NMR spectrum for the molecule shown below. Clearly show the...
4. Draw a clear and accurate NMR spectrum for the molecule shown below. Clearly show the number of peaks, and the integration, chemical shift and splitting of each peak. PP 5. Use the chemspider.com to look up the NMR spectrum for the compound in 4. Compare that spectrum to your answer in 4. Draw that spectrum here, explaining the differences between the actual spectrum and what you predicted. Don't worry if you what you initially drew was incorect PPM
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, Hg, etc) and each signal (label signals A, B, etc.) by using the standard subscript system that we have...
8. Fill in the table below with the information on each unique 1H-NMR signal. You may treat all aromatic protons a...
8. Fill in the table below with the information on each unique 1H-NMR signal. You may treat all aromatic protons as a single signal if that helps. Peak # Chemical Shift (8) # of H Multiplicity Proposed Fragment Structure 9. Based on your molecular formula, 'H-NMR integration and 13C-NMR, is there any symmetry in your molecule? Explain. Chapter 5: INTEGRATED SPECTROSCOPY PROBLEMS 139 ompound 81 is a liquid (boiling point 85' C) that is commonly used as an aprotic solvent....
Please show all work! Thank you :)
1. Draw the 1H-NMR spectrum of 1,4-dimethoxybenzene. Clearly show the multiplicity, the relative peak heights, and integration value of each signal in the 1H NMR spectrum. Chemical shifts. 1,4-Dimethoxybenzene: 3.80 (CH3), 6.80 ppm (Ph-H). (35 points) 2. What is the absorptivity of an analyte in a concentration of 5 mM with an absorbance of 0.8 when measured with a 1-cm pathlength cuvette. (25 points)
for the following 2 compounds, please calculate, and
show the calculations for, the degree of unsaturation, assign the
IR spectrum peaks, assign the 13C NMR peaks, assign the 1H NMR
peaks, and draw the structure for the unknown compound.
CHIM 245 Spectroscopy Problem Set #2 In this problem set there are two unknown compounds. You are provided with the formula, IR spectrum, "C NMR spectrum, and 'H NMR spectrum for each compound. Each unknown is worth 10 points, with an...
Fill out this table based on the IR spectrum of
1,4-Dimethoxybenzene below. If you show the table clearly, I will
rate :)
Label
Absorbance Max
Relative Intensity
Shape
Functional Group/Hybridization
Considerations,
Comments
% Transmittance 4000 3500 3278.64 3000 3053.06 2952.13 2 2835.57 2500 Wavenumbers (cm-1) 2000 hamid 1629.41 1600.80 1584.97 1500 1507.82 1465.15 1437.46 1406.96 1378.72 1362.85 1324.70 1238.14 1276.50 1215.43 1173.82 1138.65 1111.76 1000 1036.98 958.73 905.49 877.89 813.34 740.84 706.73 639.05 621.60
3) What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C2H, NO and a characteristic IR stretch near 1700 cm?? Relative integration is shown. a) Explain the multiplicity and the chemical shift of each signal b) Indicate in each signal how you would calculate the coupling constants (). Give an approximate value (range) for each of the expected J values c) Indicate the 'H coupling showing the above-indicated J values ? PPM
NMR Data: Attach 1H NMR spectrum; draw the Lewis structure and an acceptable name of the identified compound on the spectrum. Show all bonds to the hydrogens. Label the different sets of hydrogens (i.e. Ha. Hy, H1, H2, etc.). Create a table that summarizes the chemical shift, integration, multiplicity, the proton assignment, and justification of each signal. Phenyl Acetate or Methyl Benzoate "C227 Baeyer-Villiger Reaction" 2 1.0000 0.4998 U.98.39 - M 7.4235 - M 7.2793 - M 7.1626 1 "C:\CHEM...
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...
4. Draw a clear and accurate NMR spectrum for the molecule shown below. Clearly show the number of peaks, and the integration, chemical shift and splitting of each peak. PP 5. Use the chemspider.com to look up the NMR spectrum for the compound in 4. Compare that spectrum to your answer in 4. Draw that spectrum here, explaining the differences between the actual spectrum and what you predicted. Don't worry if you what you initially drew was incorect PPM
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, Hg, etc) and each signal (label signals A, B, etc.) by using the standard subscript system that we have...
8. Fill in the table below with the information on each unique 1H-NMR signal. You may treat all aromatic protons as a single signal if that helps. Peak # Chemical Shift (8) # of H Multiplicity Proposed Fragment Structure 9. Based on your molecular formula, 'H-NMR integration and 13C-NMR, is there any symmetry in your molecule? Explain. Chapter 5: INTEGRATED SPECTROSCOPY PROBLEMS 139 ompound 81 is a liquid (boiling point 85' C) that is commonly used as an aprotic solvent....
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