Based on the NMR spectrum in Figure 16-32, can Unknown 1 be CH3CH2CH2CO2C6H5 or CH3CH2OCH2(CwO)C6H5? Why or why not?
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Based on the NMR spectrum in Figure 16-32, can Unknown 1 be
CH3CH2CH2CO2C6H5 or CH3CH2OCH2(CwO)C6H5? Why...
LABORATORY 9 SODIUM BOROHYDRIDE REDUCTION OF A CHIRAL KETONE FIGURE 9.8 'H NMR spectrum of a...
LABORATORY 9 SODIUM BOROHYDRIDE REDUCTION OF A CHIRAL KETONE FIGURE 9.8 'H NMR spectrum of a mixture of cis and trans 2-methylcyclohexanol in CDCI, solution FIGURE 9.9 IR spectrum of 2-methylcyclohexanol ANALYSIS OF THE ATTACHED 'H-NMR SPECTRUM OF A MIXTURE OF TRANS- AND CIS-2-METHYLCYCLOHEXANOL With the discussion above of Figure 9.6 and Figure 9.7, you should have all the tools to analyze the spectrum. Here are some additional points: In the 'H NMR spectrum depicted in Figure 9.8, you will...
The NMR spectrum of the aromatic section of a compound is presented in figure 1. 3....
The NMR spectrum of the aromatic section of a compound is presented in figure 1. 3. 78 7.7 74 7.5 74 73 7.2 7.1 70 7 64 3 62 ppm Figure 1: NMR spectrum of unknown. 6: 6.25 (d, J-3Hz ) , 6.38 (dd, J-8Hz , J-3Hz), 7.75 (d, J- 8Hz). acquire the NMR spectrum Determine which compound (A, B or C) was used to a. presented in figure 1 (1 mark). R Re H H. H. Ra HT HT...
H NMR Spectrum: For each signal: 1.) Identify its environment 2.) Identify its spin-spin coupling...
H NMR Spectrum:
For each signal:
1.) Identify its environment
2.) Identify its spin-spin coupling (identify how many protons
are 3 bonds away, causing the coupling)
3.) Identify its integration value
Why is the peak at 6.3 ppm broadened?
Explain why there are 2 doublets in the aromatic region, but 4
aromatic protons on benzocaine
Why is the quartet at ~4.3 ppm so far downfield compared to the
triplet at ~ 1.3 ppm?
What is the purpose of using sulfuric...
Below is an NMR spectrum and IR data for an unknown organic molecule (molecular formula C...
Below is an NMR spectrum and IR data for an unknown organic molecule (molecular formula C H2O). On your answer sheet: (1) draw the structure of the unknown organic molecule in the box, (2) label the protons that give rise to each signal (label H, H, etc.) on your drawn structure, and (3) identify the functional group in the molecule responsible for each of the two IR signals. IR data: 3000-2850 cm 1, 1710 cm 1 34 B 32 1.7...
QUESTION 9 Why does a proton NMR spectrum of the NMR solvent CDCl3 show a signal...
QUESTION 9 Why does a proton NMR spectrum of the NMR solvent CDCl3 show a signal at 7.26 ppm even if the CDC13 molecule contains no hydrogen? NMR solvent CDC13 contains some unknown impurity, which shows signal at 7.26 ppm. NMR solvent CDC13 contains very small % of CHCl3 impurity, which shows signal at 7.26 ppm. NMR solvent CDC13 has one deuterium, which is an isotope of hydrogen. That shows signal at 7.26 ppm. NMR solvent CDC13 has one carbon,...
Compound has molecular formula Chiesit shows three als in the NMR spectrum, one at 0.06 ppm,...
Compound has molecular formula Chiesit shows three als in the NMR spectrum, one at 0.06 ppm, one at 2:03 ppm, and one to the relative integral of these three 32 and respectively Compound 2 has molecular forma Hyyte. It shows two signals in the 'H-NMR spectrum one at 1.00 ppm and one at 1.59pm. The relaterte als het woodpectively Dropose structures for compounds 1 and 2 explaining how you reach your conclusion Participate in Group Activity 2.9
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...
II. Number of Signals 2. Predict the number of unique protons that would generate peaks in an NMR spectrum. Look at...
II. Number of Signals 2. Predict the number of unique protons that would generate peaks in an NMR spectrum. Look at Figure 13.6 and example problem 13.2 for guidance. Then for each of these unique proton signals, predict the ppm range where you would find it and the integration value or signal area. Look at figure 13.7 in your textbook. Finally, determine the splitting pattern (multiplicity) of the signal. This is predicted using the n+1 rule. Watch the video for...
II. Number of Signals 2. Predict the number of unique protons that would generate peaks in an NMR spectrum. Look at...
II. Number of Signals 2. Predict the number of unique protons that would generate peaks in an NMR spectrum. Look at Figure 13.6 and example problem 13.2 for guidance. Then for each of these unique proton signals, predict the ppm range where you would find it and the integration value or signal area. Look at figure 13.7 in your textbook. Finally, determine the splitting pattern (multiplicity) of the signal. This is predicted using the n+1 rule. Watch the video for...
The signals in the 1H NMR spectrum of butanoic acid are labelled from A to D....
The signals in the 1H NMR spectrum of butanoic acid are labelled from A to D. Considering the spectrum, answer the questions below: [4 marks] Complete the table: Signal Chemical shift, δ (ppm) Splitting pattern (singlet, doublet, triplet, quartet, pentet, sixtet, septet, octet, nonet, multiplet) # of H neighbours Integration (# of protons) Circle or highlight the proton(s) that give rise to this signal A 11.60 CH3CH2CH2COOH B 2.35 CH3CH2CH2COOH C 1.68 CH3CH2CH2COOH D 0.98 CH3CH2CH2COOH [2 marks] Compare this...
LABORATORY 9 SODIUM BOROHYDRIDE REDUCTION OF A CHIRAL KETONE FIGURE 9.8 'H NMR spectrum of a mixture of cis and trans 2-methylcyclohexanol in CDCI, solution FIGURE 9.9 IR spectrum of 2-methylcyclohexanol ANALYSIS OF THE ATTACHED 'H-NMR SPECTRUM OF A MIXTURE OF TRANS- AND CIS-2-METHYLCYCLOHEXANOL With the discussion above of Figure 9.6 and Figure 9.7, you should have all the tools to analyze the spectrum. Here are some additional points: In the 'H NMR spectrum depicted in Figure 9.8, you will...
The NMR spectrum of the aromatic section of a compound is presented in figure 1. 3. 78 7.7 74 7.5 74 73 7.2 7.1 70 7 64 3 62 ppm Figure 1: NMR spectrum of unknown. 6: 6.25 (d, J-3Hz ) , 6.38 (dd, J-8Hz , J-3Hz), 7.75 (d, J- 8Hz). acquire the NMR spectrum Determine which compound (A, B or C) was used to a. presented in figure 1 (1 mark). R Re H H. H. Ra HT HT...
H NMR Spectrum:
For each signal:
1.) Identify its environment
2.) Identify its spin-spin coupling (identify how many protons
are 3 bonds away, causing the coupling)
3.) Identify its integration value
Why is the peak at 6.3 ppm broadened?
Explain why there are 2 doublets in the aromatic region, but 4
aromatic protons on benzocaine
Why is the quartet at ~4.3 ppm so far downfield compared to the
triplet at ~ 1.3 ppm?
What is the purpose of using sulfuric...
Below is an NMR spectrum and IR data for an unknown organic molecule (molecular formula C H2O). On your answer sheet: (1) draw the structure of the unknown organic molecule in the box, (2) label the protons that give rise to each signal (label H, H, etc.) on your drawn structure, and (3) identify the functional group in the molecule responsible for each of the two IR signals. IR data: 3000-2850 cm 1, 1710 cm 1 34 B 32 1.7...
QUESTION 9 Why does a proton NMR spectrum of the NMR solvent CDCl3 show a signal at 7.26 ppm even if the CDC13 molecule contains no hydrogen? NMR solvent CDC13 contains some unknown impurity, which shows signal at 7.26 ppm. NMR solvent CDC13 contains very small % of CHCl3 impurity, which shows signal at 7.26 ppm. NMR solvent CDC13 has one deuterium, which is an isotope of hydrogen. That shows signal at 7.26 ppm. NMR solvent CDC13 has one carbon,...
Compound has molecular formula Chiesit shows three als in the NMR spectrum, one at 0.06 ppm, one at 2:03 ppm, and one to the relative integral of these three 32 and respectively Compound 2 has molecular forma Hyyte. It shows two signals in the 'H-NMR spectrum one at 1.00 ppm and one at 1.59pm. The relaterte als het woodpectively Dropose structures for compounds 1 and 2 explaining how you reach your conclusion Participate in Group Activity 2.9
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...
II. Number of Signals 2. Predict the number of unique protons that would generate peaks in an NMR spectrum. Look at Figure 13.6 and example problem 13.2 for guidance. Then for each of these unique proton signals, predict the ppm range where you would find it and the integration value or signal area. Look at figure 13.7 in your textbook. Finally, determine the splitting pattern (multiplicity) of the signal. This is predicted using the n+1 rule. Watch the video for...
II. Number of Signals 2. Predict the number of unique protons that would generate peaks in an NMR spectrum. Look at Figure 13.6 and example problem 13.2 for guidance. Then for each of these unique proton signals, predict the ppm range where you would find it and the integration value or signal area. Look at figure 13.7 in your textbook. Finally, determine the splitting pattern (multiplicity) of the signal. This is predicted using the n+1 rule. Watch the video for...
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