A compound with the formula C9H8O3 shows a strong hand at 1661 cm–1 in the infrared spectrum. The proton NMR spectrum is shown, but there is a small impurity peak at 3.35 ppm that should be ignored. Expansions are shown for the downfield protons. In addition, the normal carbon-13, DEPT-135, and DEPT-90 spectral results are tabulated.
A compound with the formula C9H8O3 shows a strong hand at 1661 cm–1 in the infrared spectrum. The proton NMR spectrum is shown, but there is a small impurity peak at 3.35 ppm that should be ignored. Expansions are shown for the downfield protons. In addition, the normal carbon-13, DEPT-135, and DEPT-90 spectral results are tabulated.
Macroscale and Microscale Organic Experiments
7th Edition
ISBN:9781305577190
Author:Kenneth L. Williamson, Katherine M. Masters
Publisher:Kenneth L. Williamson, Katherine M. Masters
Chapter12: Nuclear Magnetic Resonance Spectroscopy
Section: Chapter Questions
Problem 3Q
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A compound with the formula C9H8O3 shows a strong hand at 1661 cm–1 in the infrared spectrum. The proton NMR spectrum is shown, but there is a small impurity peak at 3.35 ppm that should be ignored. Expansions are shown for the downfield protons. In addition, the normal carbon-13, DEPT-135, and DEPT-90 spectral results are tabulated.
Transcribed Image Text:1. Deduce the structure of this compound from these spectra.
10
3
1
Transcribed Image Text:140
130
7.0
(ppm)
C3H3O3
Normal Carbon
DEPT-135
DEPT-90
26 ppm
Positive
No peak
102
Negative
No peak
107
Positive
Positive
108
Positive
Positive
125
Positive
Positive
No peak
No peak
No peak
No peak
No peak
No peak
No peak
No peak
132
148
151
195
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