Use the HNMR spectra shown here to determine the structural formula for the unknown cited below. Begin by calculating the degree of unsaturation for the compound. This will help you determine the total number of pi bonds plus rings that are possible for the structure. The table of chemical shift values are provided.
Use the HNMR spectra shown here to determine the structural formula for the unknown cited below. Begin by calculating the degree of unsaturation for the compound. This will help you determine the total number of pi bonds plus rings that are possible for the structure. The table of chemical shift values are provided.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Use the HNMR spectra shown here to determine the structural formula for the unknown cited below. Begin by calculating the degree of unsaturation for the compound. This will help you determine the total number of pi bonds plus rings that are possible for the structure. The table of chemical shift values are provided.
Transcribed Image Text:Chemical Formula: C¸H100
Structure B
3H
2H
T
4
2
PPM
1
3.
Transcribed Image Text:fneqpuency than the chemical shift of methylene protons (hydrogens attached to an sp
NH:
"The values are approximate because they are affected by neighboring substituents.
Approximate Values of Chemical Shifts for 'H NMR°
The Characteristic Values of C
Table 14.1
Approximate
chemical shift
Approximate
chemical shift
Type of proton
(ppm)
Type of proton
(ppm)
-CH3
0.85
-H-
2.5-4
-CH2-
1.20
Br-C-H
2.5-4
- CH-
1.55
Cl
H-
3-4
Le
-C=C-CH3
1.7
F-C-H
ne
rs
4-4.5
ne
-C-CH3
2.1
R-NH2
Variable, 1.5-4
R-OH
Variable, 2-5
CH3
2.3
opm
HO-
Variable, 4-7
-C=C-H
2.4
H-
6.5-8
R-0-CH3
3.3
H-
9.0-10
R-C=CH2
4.7
R
С-ОН
Variable, 10-12
R-C=C-H
5.3
Variable, 5-8
R R
spectrum
inds
n in Table
Carbon that
wironment. Similarly, the chemical
Lohift of methyl
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