Write a structure consistent with the molecular formula and
H-NMR spectrum. Symmetry is important for many of them to reduce
the number of NMR peaks expected. Show all necessary workings and
explanations. 
Homework Answers
9.
the quartet and triplet at around 4 and 1.5 ppm is due to ethyl group attached to oxygen
singlet at 2 ppm is due to methyl group attached to carbonyl group
therefore the structure of the compound is ethyl acetate
12.
the multiplet at 3.8 ppm is for CH proton
the doublet at 1.1 ppm is for methyl proton
the broad singlet is for hydroxy group (-OH)
10.
the doublet at around 2.6 ppm is for methylene group attached to CN
the multiplet at around 1.7 ppm is for CH proton attached to methyl and methylene group
the doublet at around 0.9 ppm is for methyl group attached to CH
therefore the structure of the compound is
13.
the quartet and triplet at 2.5 and 1 ppm is for three ethyl group attached to nitrogen
therefore the structure of the compound is
11.
the triplet at 3.5 ppm is for methylene group attached to oxygen
the multiplet at 1.5 ppm is for methylene group attached to methylene and methyl group
the triplet at 1 ppm is for methyl group attached methylene group
therefore the structure of the compound is n-propanol
CH3-CH2-CH2-OH
14.
the singlet 2.8 ppm is due to methyl group attached to nitrogen
the singlet at 2 ppm is due to methyl group attached to carbonyl group
the singlet at 7.5 ppm is due to proton attached to nitrogen
therefore the structure of the compound is
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Write a structure consistent with the molecular formula and H-NMR spectrum. Symmetry is important for many of them to re...
Write a structure consistent with the molecular formula and H-NMR spectrum. Symmetry is important for many of them to re...
Write a structure consistent with the molecular formula and
H-NMR spectrum. Symmetry is important for many of them to reduce
the number of NMR peaks expected. Show all working and
explanation
20. CeHN2O2 23. CeH1o (long-range coupling, areas 1:1:2:3:3) 24. CaHeO2 (area ratio 1:2:3) 21. CaHiO (isomer Problem 25, area ratio 1:1:3:3) 25. CHN (area ratio 1:3: 22. CaH10O (isomer f Problem 21, area ratio 1:1:3:3) PPM 2 PPM
20. CeHN2O2 23. CeH1o (long-range coupling, areas 1:1:2:3:3) 24. CaHeO2 (area...
The H-NMR spectrum of an unknown compound (formula CaHgO2) is shown below. Draw the structure of...
The H-NMR spectrum of an unknown compound (formula CaHgO2) is shown below. Draw the structure of the unknown compound. Question 5 4 1 6 5 8 10 11 Ppm The 13C-NMR spectrum of an unknown compound (formula CgH180) is shown below. Its 1H-NMR spectrum only shows one singlet at 1.2 ppm. Draw the structure of this unknown compound. uestion 2 220 200 160 140 120 PPM 100 80 240 180 60 40 20 Create OscerSketch Answer 2 What would be...
Draw the structure that has a molecular formula of C3H7CIO that produced the 'H NMR shown...
Draw the structure that has a molecular formula of C3H7CIO that produced the 'H NMR shown below. singlet 2H singlet 1H doublet 2H doublet 2H JE 12 11 10 9 8 4 3 2 1 7 6 5 Chemical shift (ppm)
The mass spectrum of compound A shows molecular ion peak at m/z 88. The IR spectrum...
The mass spectrum of compound A shows molecular ion peak at m/z 88. The IR spectrum of this compound has a broad peak between 3200 and 3550 cm-1. The 1H NMR spectrum of A shows the following peaks: a triplet at d 0.9, a singlet at d 1.1, one more singlet at d 1.15, and a quartet at d 1.6. The area ratio of these peaks is 3:6:1:2. The 13C NMR contains 4 signals. In the space below, propose a...
(References The proton NMR spectrum for a compound with the formula C,H,O is shown below along...
(References The proton NMR spectrum for a compound with the formula C,H,O is shown below along with the spectral data in tabular form. (It may be necessary to expand (zoom) some of the 'H signals to view spin-spin splitting details.) Intensity 258 $ $ 488 14 13 12 11 10 9 8 7 6 5 4 3 Chemical Shift (oppm 2 1 0 . Reproduced with permission from Sim. Aldri Ca LLC The IH signal at 2.15 ppm is an...
The proton NMR spectrum for a compound with the formula C,H,O, is shown below along with...
The proton NMR spectrum for a compound with the formula C,H,O, is shown below along with the spectral data in tabular form. (It may be necessary to expand (zoom) some of the 'H signals to view spin-spin splitting details.) This compound exhibits strong infrared absorption at 1727 and 1195 em plus a medium intensity band at 1637 cm! 13C NMR Data 'H NMR Data Proton Shift Relative Area Normal Carbon DEPT-135 DEPT-90 14.2 Positive No peak 60.4 Negative No peak...
(10 points) Analysis of 'H NMR spectrum. Below is the 'H NMR spectrum of the product...
(10 points) Analysis of 'H NMR spectrum. Below is the 'H NMR spectrum of the product from this week's experiment. 3H, t, J = 7.1 Hz 1H, d, J = 15.8 Hz 2H, 9, J = 7.1 Hz 5H, m 1H, d, J= 15.8 Hz 11 10 9 8 7 6 5 4 3 2 1 ppm Summary of peaks (ppm): 1.32 (3H, t, J = 7.1 Hz), 4.24 (2H, q, J = 7.1 Hz), 6.43 (1H, d J =...
3. Given the 'H NMR spectrum below and a molecular formula of CaH.O, provide a structure....
3. Given the 'H NMR spectrum below and a molecular formula of CaH.O, provide a structure. Note you must assign all of the signals in the spectrum below to receive full credit. IR: 3300 cm (broad) (5 pts.) зн, d Зн, t 2H,t 2H, q 2H, m 1H, bs 1H, m 4 3 2 PPM 4. In the space below, draw a 'H NMR spectrum for each of the following molecules. Note that only one of these will be graded...
Given the Cosey, HSQC and HMBC experiments assign the 1H NMR spectrum and 13C NMR spectrum...
Given the Cosey, HSQC and HMBC experiments assign the
1H NMR spectrum and 13C NMR spectrum signals
of the compound. 1H peaks are labelled using lowercase
letters and 13C peaks using uppercase. Be aware that the
letters of the same peak does not necessarily refer to the position
in the molecule. For example, peak a in the 1H and peak
A in the 13C NMR are not necessarily assigned to the
same number atom. The assignment of protons 4 and...
(References) The proton NMR spectrum for a compound with the formula C,H,NO, is shown below along with the spectr...
(References) The proton NMR spectrum for a compound with the formula C,H,NO, is shown below along with the spectral data in tabular form. (It may be necessary to expand (zoom) some of the 'H signals to view spin-spin splitting details.) Intensity 14 13 12 11 10 9 2 1 0 1 -2 -3 8 7 6 5 4 3 Chemical Shift (6) ppm Reproduced with permission from Sigma-Aldrich Co. LLC The infrared spectrum exhibits strong bands at 1750 and 1562...
Write a structure consistent with the molecular formula and
H-NMR spectrum. Symmetry is important for many of them to reduce
the number of NMR peaks expected. Show all working and
explanation
20. CeHN2O2 23. CeH1o (long-range coupling, areas 1:1:2:3:3) 24. CaHeO2 (area ratio 1:2:3) 21. CaHiO (isomer Problem 25, area ratio 1:1:3:3) 25. CHN (area ratio 1:3: 22. CaH10O (isomer f Problem 21, area ratio 1:1:3:3) PPM 2 PPM
20. CeHN2O2 23. CeH1o (long-range coupling, areas 1:1:2:3:3) 24. CaHeO2 (area...
The H-NMR spectrum of an unknown compound (formula CaHgO2) is shown below. Draw the structure of the unknown compound. Question 5 4 1 6 5 8 10 11 Ppm The 13C-NMR spectrum of an unknown compound (formula CgH180) is shown below. Its 1H-NMR spectrum only shows one singlet at 1.2 ppm. Draw the structure of this unknown compound. uestion 2 220 200 160 140 120 PPM 100 80 240 180 60 40 20 Create OscerSketch Answer 2 What would be...
Draw the structure that has a molecular formula of C3H7CIO that produced the 'H NMR shown below. singlet 2H singlet 1H doublet 2H doublet 2H JE 12 11 10 9 8 4 3 2 1 7 6 5 Chemical shift (ppm)
(References The proton NMR spectrum for a compound with the formula C,H,O is shown below along with the spectral data in tabular form. (It may be necessary to expand (zoom) some of the 'H signals to view spin-spin splitting details.) Intensity 258 $ $ 488 14 13 12 11 10 9 8 7 6 5 4 3 Chemical Shift (oppm 2 1 0 . Reproduced with permission from Sim. Aldri Ca LLC The IH signal at 2.15 ppm is an...
The proton NMR spectrum for a compound with the formula C,H,O, is shown below along with the spectral data in tabular form. (It may be necessary to expand (zoom) some of the 'H signals to view spin-spin splitting details.) This compound exhibits strong infrared absorption at 1727 and 1195 em plus a medium intensity band at 1637 cm! 13C NMR Data 'H NMR Data Proton Shift Relative Area Normal Carbon DEPT-135 DEPT-90 14.2 Positive No peak 60.4 Negative No peak...
(10 points) Analysis of 'H NMR spectrum. Below is the 'H NMR spectrum of the product from this week's experiment. 3H, t, J = 7.1 Hz 1H, d, J = 15.8 Hz 2H, 9, J = 7.1 Hz 5H, m 1H, d, J= 15.8 Hz 11 10 9 8 7 6 5 4 3 2 1 ppm Summary of peaks (ppm): 1.32 (3H, t, J = 7.1 Hz), 4.24 (2H, q, J = 7.1 Hz), 6.43 (1H, d J =...
3. Given the 'H NMR spectrum below and a molecular formula of CaH.O, provide a structure. Note you must assign all of the signals in the spectrum below to receive full credit. IR: 3300 cm (broad) (5 pts.) зн, d Зн, t 2H,t 2H, q 2H, m 1H, bs 1H, m 4 3 2 PPM 4. In the space below, draw a 'H NMR spectrum for each of the following molecules. Note that only one of these will be graded...
Given the Cosey, HSQC and HMBC experiments assign the
1H NMR spectrum and 13C NMR spectrum signals
of the compound. 1H peaks are labelled using lowercase
letters and 13C peaks using uppercase. Be aware that the
letters of the same peak does not necessarily refer to the position
in the molecule. For example, peak a in the 1H and peak
A in the 13C NMR are not necessarily assigned to the
same number atom. The assignment of protons 4 and...
(References) The proton NMR spectrum for a compound with the formula C,H,NO, is shown below along with the spectral data in tabular form. (It may be necessary to expand (zoom) some of the 'H signals to view spin-spin splitting details.) Intensity 14 13 12 11 10 9 2 1 0 1 -2 -3 8 7 6 5 4 3 Chemical Shift (6) ppm Reproduced with permission from Sigma-Aldrich Co. LLC The infrared spectrum exhibits strong bands at 1750 and 1562...
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