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In the following E- and Z- stereoisomers, the 'H NMR...
5. In the following E- and Z- stereoisomers of 1-bromo-2,3-dimethylpent-2-ene, the "H NMR spectrum of one of the is...
5. In the following E- and Z- stereoisomers of 1-bromo-2,3-dimethylpent-2-ene, the "H NMR spectrum of one of the isomers consists of a quartet (2 H) at 0 2.8, a triplet (3 H) at 8 0.9, a singlet at 8 3.5 for the CH2-Br moiety and two singlets at 8 2.1 and 2.3 for the CH3 groups. Assign the values and suggest an experiment to establish which of the isomers gives rise to the spectrum. CH3CH2 CH3 CH3CH2 CH2Br HC CH2B...
just the circled ones only 8.10 Suggest structures consistent with the following 'H NMR data: a....
just the circled ones only
8.10 Suggest structures consistent with the following 'H NMR data: a. Сно triplet (1.0 ppm, 3H) singlet (2.1 ppm, 3H) quartet (2.4 ppm, 2H) b. С Н.о, triplet (1.2 ppm, 3H) singlet (2.1 ppm, 3H) quartet (4.1 ppm, 2H) усно singlet (2.4 ppm, 3H) multiplet (7.5 ppm, 5H) singlet (1.6 ppm, 6H) singlet (3.1 ppm, 2H) multiplet (7.3 ppm, 5H) 1. Сно, triplet (1.2 ppm, 3H) singlet (2.4 ppm, 3H quartet (4.2 ppm, 2H) ....
H-NMR data for three isomers of C5H10Br2 is given brlow. Give the structure of each isomer....
H-NMR data for three isomers of C5H10Br2 is given brlow. Give the
structure of each isomer.
a. 8 1.0, singlet, 9H 8 5.3, singlet, 1H b. 8 1.0, triplet, 6H 8 2.4, quartet, 4H c. 8 1.3, multiplet, 2H 8 1.85, multiplet, 4H 83.35, triplet, 4H
Question 45 1. a) NMR spectrum of CH3-CH2-O-CH3 contain one singlet, one quartet, and one triplet:...
Question 45 1. a) NMR spectrum of CH3-CH2-O-CH3 contain one singlet, one quartet, and one triplet: True/False True False Question 46 1.b) CHCI-CHBr2: two doublets (d) will appear in the NMR spectra: True/False True False Question 47 1.c) CH3-CH2-CO-CH2-CN: IR spectra will show a peak at 1740 and 2200cm-1: True/False True False Question 48 1 pts 1.d) NMR of the above molecule will show two triplets and one singlets: True/False True False Question 49 1 pts 1. e) Or, one...
4. Consider the following two diastercomers: Both compounds generate 'H NMR spectra with the following signals:...
4. Consider the following two diastercomers: Both compounds generate 'H NMR spectra with the following signals: A multiplet between 7.20-7.63 ppm with an integration of 5H Two separate doublets between 5.70-6.50 ppm, each with an integration of 1H A singlet around 1.30 ppm with an integration of 9H Despite the similarities, how could you differentiate between the H NMR spectra of these isomers? 5. Assign each set of protons to their appropriate signals in the 'H NMR spectrum shown below....
7. Which compound below be H-1 NMR 0.9 ppm (quartet fits the following spectral data? (6...
7. Which compound below be H-1 NMR 0.9 ppm (quartet fits the following spectral data? (6 points) 1.2 ppm (sextet 2 hydrogens), 2.1 ppm (triplet, hydrogens), 4.3 ppm (singlet 3 hydrogens) C-13 NMR 5 signals 25 ppr ppm (CH2); 61 ppm: (CH3) 198 Ppm (C). IR strong peak 1735 cm Ignals 25 ppm (CH): 35 ppm (CH2), 46 ppm (CH2); 61 ppm: em Mass Spee parent M+ = 102 Mass Spec paren ou 0 H2 CH3 HjC Holo H3C- CC...
pounds that have the following 'H NMR spectra features. ures for compound oublet and one septet...
pounds that have the following 'H NMR spectra features. ures for compound oublet and one septet one singlet, one triplet, one quartet 11 Without considering spin-spin splitting, how many 'H and 13C NMR peaks should the following compounds have? (a) H3C CHg (b) CH3 (e) 0 CH₃ CH3CCHE H3C CH3 C= (d) HEÇO 1 x CH3 CH3C-c-OCHE H3C 12. What is the structure of C3H60 with the following spectroscopic data? IR: among many peaks, there is one strong peak at...
48. Give the chemical formula (such as CHA) of the compound that has this man m/Z...
48. Give the chemical formula (such as CHA) of the compound that has this man m/Z 100 M 101 Intensity 38.7 2.55 49. Give the chemical formula of the compound that has this mass spectrum: mz 93 M* Intensity 48.4 1.60 16.1 95 50. Give the structural formula (such as CH3 CH2 CI) of the compound C.HCl that has this NMR spectrum: Doublet, Multiplet Doublet, $1.04 (6H) $ 1.95 (1H) 3.35 (2H) 51. Give the structural formula of the compound...
7. Which compound below best fits the following spectral data? 8. How many signals would you...
7. Which compound below best fits the following
spectral data?
8. How many signals would you expect to see in the
broadband decoupled C^13 spectra of the following compounds?
9. If a proton gave an NMR signal at 3.2 ppm on a MHz
NMR, what would the chemical shift be of this proton (in ppm) if
the sample was run in 400 MHz NMR?
7. Which compound below best fits the following spectral data? (6 points) H-1 NMR 0.9 ppm...
Propose structures for compounds that fit the following 'H NMR data. CH,Br 2H quintet at 2.48,...
Propose structures for compounds that fit the following 'H NMR data. CH,Br 2H quintet at 2.48, J=6 Hz 4H triplet at 3.5 8, J= 6 Hz 2. C.H.O 2H quartet at 2.5 8, 3H Singlet at 2.0 8, 3H triplet at 1.08 1. C,H40 6H triplet at 0.9 8, J = 7 Hz 4H sextet at 1.6 8, J= 7 Hz 4H triplet at 2.48, J= 7 Hz CH4 6H doublet at 1.28, J= 7 Hz 3H singlet at 2.38...
5. In the following E- and Z- stereoisomers of 1-bromo-2,3-dimethylpent-2-ene, the "H NMR spectrum of one of the isomers consists of a quartet (2 H) at 0 2.8, a triplet (3 H) at 8 0.9, a singlet at 8 3.5 for the CH2-Br moiety and two singlets at 8 2.1 and 2.3 for the CH3 groups. Assign the values and suggest an experiment to establish which of the isomers gives rise to the spectrum. CH3CH2 CH3 CH3CH2 CH2Br HC CH2B...
just the circled ones only
8.10 Suggest structures consistent with the following 'H NMR data: a. Сно triplet (1.0 ppm, 3H) singlet (2.1 ppm, 3H) quartet (2.4 ppm, 2H) b. С Н.о, triplet (1.2 ppm, 3H) singlet (2.1 ppm, 3H) quartet (4.1 ppm, 2H) усно singlet (2.4 ppm, 3H) multiplet (7.5 ppm, 5H) singlet (1.6 ppm, 6H) singlet (3.1 ppm, 2H) multiplet (7.3 ppm, 5H) 1. Сно, triplet (1.2 ppm, 3H) singlet (2.4 ppm, 3H quartet (4.2 ppm, 2H) ....
H-NMR data for three isomers of C5H10Br2 is given brlow. Give the
structure of each isomer.
a. 8 1.0, singlet, 9H 8 5.3, singlet, 1H b. 8 1.0, triplet, 6H 8 2.4, quartet, 4H c. 8 1.3, multiplet, 2H 8 1.85, multiplet, 4H 83.35, triplet, 4H
Question 45 1. a) NMR spectrum of CH3-CH2-O-CH3 contain one singlet, one quartet, and one triplet: True/False True False Question 46 1.b) CHCI-CHBr2: two doublets (d) will appear in the NMR spectra: True/False True False Question 47 1.c) CH3-CH2-CO-CH2-CN: IR spectra will show a peak at 1740 and 2200cm-1: True/False True False Question 48 1 pts 1.d) NMR of the above molecule will show two triplets and one singlets: True/False True False Question 49 1 pts 1. e) Or, one...
4. Consider the following two diastercomers: Both compounds generate 'H NMR spectra with the following signals: A multiplet between 7.20-7.63 ppm with an integration of 5H Two separate doublets between 5.70-6.50 ppm, each with an integration of 1H A singlet around 1.30 ppm with an integration of 9H Despite the similarities, how could you differentiate between the H NMR spectra of these isomers? 5. Assign each set of protons to their appropriate signals in the 'H NMR spectrum shown below....
7. Which compound below be H-1 NMR 0.9 ppm (quartet fits the following spectral data? (6 points) 1.2 ppm (sextet 2 hydrogens), 2.1 ppm (triplet, hydrogens), 4.3 ppm (singlet 3 hydrogens) C-13 NMR 5 signals 25 ppr ppm (CH2); 61 ppm: (CH3) 198 Ppm (C). IR strong peak 1735 cm Ignals 25 ppm (CH): 35 ppm (CH2), 46 ppm (CH2); 61 ppm: em Mass Spee parent M+ = 102 Mass Spec paren ou 0 H2 CH3 HjC Holo H3C- CC...
pounds that have the following 'H NMR spectra features. ures for compound oublet and one septet one singlet, one triplet, one quartet 11 Without considering spin-spin splitting, how many 'H and 13C NMR peaks should the following compounds have? (a) H3C CHg (b) CH3 (e) 0 CH₃ CH3CCHE H3C CH3 C= (d) HEÇO 1 x CH3 CH3C-c-OCHE H3C 12. What is the structure of C3H60 with the following spectroscopic data? IR: among many peaks, there is one strong peak at...
48. Give the chemical formula (such as CHA) of the compound that has this man m/Z 100 M 101 Intensity 38.7 2.55 49. Give the chemical formula of the compound that has this mass spectrum: mz 93 M* Intensity 48.4 1.60 16.1 95 50. Give the structural formula (such as CH3 CH2 CI) of the compound C.HCl that has this NMR spectrum: Doublet, Multiplet Doublet, $1.04 (6H) $ 1.95 (1H) 3.35 (2H) 51. Give the structural formula of the compound...
7. Which compound below best fits the following
spectral data?
8. How many signals would you expect to see in the
broadband decoupled C^13 spectra of the following compounds?
9. If a proton gave an NMR signal at 3.2 ppm on a MHz
NMR, what would the chemical shift be of this proton (in ppm) if
the sample was run in 400 MHz NMR?
7. Which compound below best fits the following spectral data? (6 points) H-1 NMR 0.9 ppm...
Propose structures for compounds that fit the following 'H NMR data. CH,Br 2H quintet at 2.48, J=6 Hz 4H triplet at 3.5 8, J= 6 Hz 2. C.H.O 2H quartet at 2.5 8, 3H Singlet at 2.0 8, 3H triplet at 1.08 1. C,H40 6H triplet at 0.9 8, J = 7 Hz 4H sextet at 1.6 8, J= 7 Hz 4H triplet at 2.48, J= 7 Hz CH4 6H doublet at 1.28, J= 7 Hz 3H singlet at 2.38...
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