(200 MHz, CDCI, solution) TMS 10 4 1 8 (ppm) 8. 7 6. 3 Signal C Signal B Signal A H NMR Spectrum (200 MHz, CDCI, solution) expansion 1.0 ppm 2.0 TMS 10 9. 7. 6 5 4 3 8 (nnml Signal C Signal B Signal A 10

(200 MHz, CDCI, solution) TMS 10 4 1 8 (ppm) 8. 7 6. 3 Signal C Signal B Signal A H NMR Spectrum (200 MHz, CDCI, solution) expansion 1.0 ppm 2.0 TMS 10 9. 7. 6 5 4 3 8 (nnml Signal C Signal B Signal A 10

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter16: Introduction To Magnetic Spectroscopy

Section: Chapter Questions

Problem 16.49E

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Concept explainers

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

Using n+1 rule determine how many neighboring hydrogens each Hx group has and number of H for each signal. Draw structure that fits each spectrum and assign CHx group to hydrogens in structure. (spectra are for isomers of esters C4H8O2)

H NMR Spectrum
(200 MHz, CDCI, solution)
TMS
1
8 (ppm)
10
8.
7
6.
4
3
Signal C
Signal B Signal A
1H NMR Spectrum
(200 MHz, CDCI, solution)
expansion
1.0
ppm
2.0
TMS
96.
8.
7.
4
3
1
8 (nnml
Signal C
Signal B Signal A
2.
5
10

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