Help needed with the following C-NMR analysis on the molecule hexaphenylbenzene.Note: we can assume the ispo carbons for the central ring are downfield of those of the subtitients. "Ipso" standing for the aromatic carbon to which a susbstituent is attached.Thank you in advance! 4039343341383532NMR nuclei observed: C13Solvent: CDC13NMR field strength: 400 MHz423730536312928,2747222326238151091612421251114172012131819 140 130T120 11010090(ppm)76.9877.1277.26127.67127.90129.22133.41134.6080PPM605040Assignment3020100

Answered: C-NMR analysis on the molecule…

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Chemistry

C-NMR analysis on the molecule hexaphenylbenzene.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter19: Nuclear Magnetic Resonance Spectroscopy

Section: Chapter Questions

Problem 19.10QAP: Why is 133C-133C spin-spin splitting not observed in ordinary organic compounds?

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Concept explainers

Analyzing and Predicting Spectroscopic Data

The interaction of electromagnetic radiation with the structure of molecules in the sample and their study is referred spectroscopy. Several spectroscopic methods are used to acquire sample information, and these methods are proved to be accurate, fast, and non-destructive. The information obtained about the content and composition of molecules from these spectroscopic methods is called spectroscopic data.

Question

100%

Help needed with the following C-NMR analysis on the molecule hexaphenylbenzene.

Note: we can assume the ispo carbons for the central ring are downfield of those of the subtitients. "Ipso" standing for the aromatic carbon to which a susbstituent is attached.

Thank you in advance!

40
39
34
33
41
38
35
32
NMR nuclei observed: C13
Solvent: CDC13
NMR field strength: 400 MHz
42
37
30
5
36
31
29
28,
27
4
7
22
23
26
2
3
8
15
10
9
16
12421
25
11
14
17
20
12
13
18
19

140 130
T
120 110
100
90
(ppm)
76.98
77.12
77.26
127.67
127.90
129.22
133.41
134.60
80
PPM
60
50
40
Assignment
30
20
10
0

Definition Definition Organic compounds with a planar cyclic ring of atoms bonded through alternated single and double bonds. Aromatic organic compounds, also called arenes, are an important class of hydrocarbons under the branch of organic chemistry.

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