4. The chemical shifts of Ha and Hb in the ¹H nmr spectrum of the compound shown below are0.88 and 3.44 ppm respectively. In comparison the methylene protons in cyclopentane resonateat approximately 1.5 ppm.Explain why Ha and Hb resonate at the given frequencies.HH3CH₂CO5. Using the table provided predict the chemical shifts of the protons labeled a-b inCompound B below. Show your working.HaHbHaPhHb HOdH = 5.25 + Zgem + Z cis + ZtransHSubstituent Zgem0.440.980.51.351.001.041.000.231.181.032.09Alkyl-C=C-C=CPhenylCIBrCOOH-C=N-OR-C(=O)HOC(=O)RZcisZtrans-0.29-0.210.10-0.10-0.26-0.040.350.370.190.030.400.551.350.740.780.58-1.06-1.280.97 1.21-0.40 -0.67

Here we have to understand the chemical shift values for the Hb and Ha proton in the rigid ring…

The chemical shifts of Ha and Hb in the ¹H nmr spectrum of the compound shown below are 0.88 and 3.44 ppm respectively. In comparison the methylene protons in cyclopentane resonate at approximately 1.5 ppm. Explain why Ha and Hb resonate at the given frequencies. Ha. Hb HO. H

The chemical shifts of Ha and Hb in the ¹H nmr spectrum of the compound shown below are 0.88 and 3.44 ppm respectively. In comparison the methylene protons in cyclopentane resonate at approximately 1.5 ppm. Explain why Ha and Hb resonate at the given frequencies. Ha. Hb HO. H

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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NMR Spectroscopy

NMR stands for Nuclear Magnetic Resonance in which the study of different molecules is done based on the interaction of radiofrequency electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. A precise study of spectra of visible light and all bands of electromagnetic radiation is called spectroscopy.

Question

4. The chemical shifts of Ha and Hb in the ¹H nmr spectrum of the compound shown below are
0.88 and 3.44 ppm respectively. In comparison the methylene protons in cyclopentane resonate
at approximately 1.5 ppm.
Explain why Ha and Hb resonate at the given frequencies.
H
H3CH₂CO
5. Using the table provided predict the chemical shifts of the protons labeled a-b in
Compound B below. Show your working.
Ha
Hb
Ha
Ph
Hb HO
dH = 5.25 + Zgem + Z cis + Ztrans
H
Substituent Zgem
0.44
0.98
0.5
1.35
1.00
1.04
1.00
0.23
1.18
1.03
2.09
Alkyl
-C=C
-C=C
Phenyl
CI
Br
COOH
-C=N
-OR
-C(=O)H
OC(=O)R
Zcis
Ztrans
-0.29
-0.21
0.10
-0.10
-0.26
-0.04
0.35
0.37
0.19
0.03
0.40
0.55
1.35
0.74
0.78
0.58
-1.06
-1.28
0.97 1.21
-0.40 -0.67

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