fig. 13.1 nmriruv. fig. 13.2 nmr: excited spin state ir: excited vibrational state uv: excited...
TRANSCRIPT
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Fig. 13.1
NMRIRUV
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Fig. 13.2NMR: excited spin stateIR: excited vibrational stateUV: excited electronic state
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Fig. 13.30
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Tab. 13.4
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Fig. 13.31
“fingerprint region”
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Fig. 13.32
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Fig. 13.33
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Fig. 13.34
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Fig. 13.35
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Which one of the following compounds is most consistent with the IR given?
OH
O
CH3
O
OH OH
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IR: Isolation of Cinnamon Oil from CinnamonExp. [11C]
Mayo, pp. 213 – 218. Please note the prior reading assignments given on p. 213.
Your write-up should include the following:
• Data from the experiment including mass of oil, percent recovery from cinnamon, IR spectrum.
• Structure of cinnamon oil, with an analysis of the IR spectrum.• Problems 6-77, 6-78, 6-79, 6-80
Steam Distillation – http:wiley.com/college/chem/mayo321850/wave_s.html(under Reference Discussions pp. 27-30)
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Fig. 13.1
NMRIRUV
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Fig. 13.2NMR: excited spin stateIR: excited vibrational stateUV: excited electronic state
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Fig. 13.3
• The lower energy orientation is the oneparallel to Ho and more nuclei havethis orientation.
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Fig. 13.4• The energy difference in the two spin statesis proportional to the strength of the appliedfield.
4.7 Tesla - 200MHz (radiofrequency)
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Fig. 13.5
Source of energyto excite nucleus
Aligns nuclear spins
Contains sample,may have deuteratedsolvent
Detects theabsorption of rf radiation
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Fig. 13.23a
• Number of signals – number of nonequivalent protons (H)
• Chemical shift – electronic environment of the proton, represented by ppm• Integration – number of equivalent protons (H), represented as area beneath the curve• Multiplicity – number of protons (H) on the adjacent positions
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Fig. 13.6
• Alone, a proton would feel the full strengthof the external field, but a proton in anorganic molecule responds to both theexternal field plus any local fields withinthe molecule.
• Electrons “shield” the proton from thefull effects of the magnetic field.
Chemical Shift
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Fig. 13.7 • Electron density “shields” theproton from the full effects ofthe external magnetic field.
H-C-CH-C-XH-C=CH-ArH-C=O
Chemical Shift
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Tab. 13.1
H-C-X 2-5 ppm
Chemical Shift
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Fig. 13.11
Integration
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Integration
C8H8O2
http://www.chem.ucla/~webspectra
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Fig. 13.12
Multiplicity
n+1 Rule - A signal is split into n+1 peaks,where n=number of adjacent protons (H)
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Fig. 13.15
C2H5Br
2
3
Deduce structure of :
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Fig. 13.17
1 H
6 H
Deduce structure of C3H7Cl
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Fig. 13.19
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Fig. 13.20
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Fig. 13.21
-OH protons areexchangeable
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Fig. 13.22
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Tab. 13.3
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Fig. 13.23b
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Fig. 13.24
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Fig. 13.25
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Fig. 13.26a
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Fig. 13.26b
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Fig. 13.28
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Fig. 13.29
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Fig. 13.37
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Tab. 13.5
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Fig. 13.38
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Fig. 13.39
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Fig. 13.40
+ e- .+ + 2e-
M+
base peak
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Fig. 13.41
chlorobenzene
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Fig. 13.42
decane base peakM+
molecular ion peak
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Fig. 13.43
propylbenzene
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Fig. 13.44
GC-MS
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Spectra for homework problems at the end of Chapter 13 -
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Fig. 13.45
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Fig. 13.46a
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Fig. 13.46b
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Fig. 13.47a
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Fig. 13.47b
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Fig. 13.48a
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Fig. 13.48b
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Fig. 13.49a
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Fig. 13.49b
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Fig. 13.49c
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Fig. 13.49d