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Practice Problems: 1a. Analyze the given H NMR spectrum of 3-methyl-2-butanone. Explain why there are 3...
Which of the following generally produce signals between 10 - 50 ppm in 13C NMR spectroscopy?...
Which of the following generally produce signals between 10 - 50 ppm in 13C NMR spectroscopy? sp3-hybridized carbon atoms (methyl, methylene, and methine groups) O sp-hybridized carbon atoms as well as sp3-hybridized carbon atoms that are deshielded by electronegative atoms sp2-hybridized carbon atoms O carbon atoms of carbonyl groups Give the number of different kinds of protons the compound that shows the H NMR spectrum shown below: Proton NMR ul ilu 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4...
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...
(a) From the spectral data ( H, C NMR, IR, MS) you were given, identify the...
(a) From the spectral data ( H, C NMR, IR, MS) you were given,
identify the structure of your product. Explain why you chose your
particular product based on the spectroscopic data.
(b) Fully assign the 1H NMR spectrum of your product (i.e.
determine which peaks in the 1H NMR correspond to which hydrogens
in the product). You will not receive full marks for determination
of the unknown unless you assign the 1H NMR spectrum
completely.
(c) Now work backwards...
HO HW2. A student ran the Grignard reaction below: CH3MgBr diethyl ether 2-pentanone 2-methyl-2-pentanol HW 3....
HO HW2. A student ran the Grignard reaction below: CH3MgBr diethyl ether 2-pentanone 2-methyl-2-pentanol HW 3. A second student tries to run the same Grignard reaction as in HW 2 and obtains the following FT-IR spectrum: ) transmittance 000 2000 1500 1000 wavenumber(cm) a. Based solely on the IR data, did the second student's reaction go to completion? In other words, was all of the ketone starting material used up? Yes or No and explain. b. When the second student...
Given the NMR and IR graphs, which unknown compound fits your graph, and fill out the...
Given the NMR and IR graphs, which unknown compound fits your
graph, and fill out the tables about your unknown.
STANDARD 1N OBSERVE Archive directory! Sample directory: F1101 PROTON A 14 Pulse Sequence! s2pul Solvent: CDC13 Ambient temperature Mercury-300BB Hvarian300 Relax delay 1.000 sec Puis 45.0 degrees Acg. time 1.996 sec Width 4803.1 MZ & repetitions OBSERVE NL, 233.9587289 MHZ DATA PROCESSING FT size 32768 Total tine min. 25 sec 2.8 0 ppm 0.94 1604 1081 1364 3063 534 1384...
2. List the expected spectral data of 2-ethyl-3-hydroxy-hexanal observed from an IR, a 'H-NMR and mass...
2. List the expected spectral data of 2-ethyl-3-hydroxy-hexanal observed from an IR, a 'H-NMR and mass spectrum. CH3 -CH2 CH C-Hal C-N C-o CEC Intensity CEN Aromatic C=C C=0 220 200 180 160 140 120 60 40 20 0 ppm 100 80 Chemical shift (8) Intensity Bonding C-H Type of Vibration (Stretching unless noted) alkane CH -CH, alkene w-m m w-m bending bending out-of-plane bending alkyne arene Frequency (cm) 2850-3000 1375 and 1450 1450-1475 3000-3100 650-1000 3300 3030 690-900 2720...
Which of the following generally produce signals between 10 - 50 ppm in 13C NMR spectroscopy? sp3-hybridized carbon atoms (methyl, methylene, and methine groups) O sp-hybridized carbon atoms as well as sp3-hybridized carbon atoms that are deshielded by electronegative atoms sp2-hybridized carbon atoms O carbon atoms of carbonyl groups Give the number of different kinds of protons the compound that shows the H NMR spectrum shown below: Proton NMR ul ilu 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4...
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...
(a) From the spectral data ( H, C NMR, IR, MS) you were given,
identify the structure of your product. Explain why you chose your
particular product based on the spectroscopic data.
(b) Fully assign the 1H NMR spectrum of your product (i.e.
determine which peaks in the 1H NMR correspond to which hydrogens
in the product). You will not receive full marks for determination
of the unknown unless you assign the 1H NMR spectrum
completely.
(c) Now work backwards...
HO HW2. A student ran the Grignard reaction below: CH3MgBr diethyl ether 2-pentanone 2-methyl-2-pentanol HW 3. A second student tries to run the same Grignard reaction as in HW 2 and obtains the following FT-IR spectrum: ) transmittance 000 2000 1500 1000 wavenumber(cm) a. Based solely on the IR data, did the second student's reaction go to completion? In other words, was all of the ketone starting material used up? Yes or No and explain. b. When the second student...
Given the NMR and IR graphs, which unknown compound fits your
graph, and fill out the tables about your unknown.
STANDARD 1N OBSERVE Archive directory! Sample directory: F1101 PROTON A 14 Pulse Sequence! s2pul Solvent: CDC13 Ambient temperature Mercury-300BB Hvarian300 Relax delay 1.000 sec Puis 45.0 degrees Acg. time 1.996 sec Width 4803.1 MZ & repetitions OBSERVE NL, 233.9587289 MHZ DATA PROCESSING FT size 32768 Total tine min. 25 sec 2.8 0 ppm 0.94 1604 1081 1364 3063 534 1384...
2. List the expected spectral data of 2-ethyl-3-hydroxy-hexanal observed from an IR, a 'H-NMR and mass spectrum. CH3 -CH2 CH C-Hal C-N C-o CEC Intensity CEN Aromatic C=C C=0 220 200 180 160 140 120 60 40 20 0 ppm 100 80 Chemical shift (8) Intensity Bonding C-H Type of Vibration (Stretching unless noted) alkane CH -CH, alkene w-m m w-m bending bending out-of-plane bending alkyne arene Frequency (cm) 2850-3000 1375 and 1450 1450-1475 3000-3100 650-1000 3300 3030 690-900 2720...
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