EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
6th Edition
ISBN: 9781305687875
Author: Gilbert
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 9.2, Problem 23E
(a)
Interpretation Introduction
Interpretation:The triplet centered near 1.0 and 1.1 and the doublet centered near 1.6 to the hydrogen nuclei of the three different isomers from which they arise is to be assigned.
Concept Introduction : Nuclear Magnetic Resonance (NMR) spectroscopy is a logical chemistry method used in quality control.
It studies for defining the material and purity of a sample and their molecular structure. It explains magnetic energy levels undergoing the resonance transition when the atomic nuclei are exposed to an external magnetic field and an
(b)
Interpretation Introduction
Interpretation:The integrated area of the selected multiplets in the spectrum are as given, the approximate percentage of each isomer present in the mixture is to be calculated.
Concept Introduction : Nuclear Magnetic Resonance (NMR) spectroscopy is a logical chemistry method used in quality control.
It studies for defining the material and purity of a sample and their molecular structure. It explains magnetic energy levels undergoing the resonance transition when the atomic nuclei are exposed to an external magnetic field and an electromagnetic radiation is applied with the specific frequency. The NMR spectrum is obtained by detecting the absorption signals.
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Illustrate the resonance effect of the methoxy group -OCH3, on the structure of the benzene ring. Do this by writing all the possible resonance forms for methoxybenzene, including the hybrid.
Based on your structures, explain how the presence of the -OCH3 group affects: (i) the reactivity of the benzene ring towards electrophilic attack; (ii) the orientation or point of attack of an incoming electrophilic reagent on the benzene ring.
4. The success of each reaction in a Radical Fluorination of an Ibuprofen Derivative is
determined by calculating an NMR yield. To do this, one will add 1 equivalent (0.15 mmol)
of an internal standard, dibromomethane (CH2B12), to each reaction mixture when one
prepare the NMR samples. Look up the molecular weight of dibromoethane and
calculate how many mg of dibromomethane one will need to add to each reaction. (Convert
0.15 mmol of dibromometbane to mg.)
Propose a structure for an aromatic hydrocarbon, C3H10, that can form three C3H,Br products on substitution of a hydrogen on the aromatic
ring with bromine.
• You do not have to consider stereochemistry.
In cases where there is more than one answer, just give one.
• Ignore the ortho, para-directing effects of the alkyl groups in answering this question. Consider only the number of nonequivalent hydrogens
on the aromatic ring.
....
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Chapter 9 Solutions
EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
Ch. 9.2 - Prob. 1ECh. 9.2 - Prob. 2ECh. 9.2 - Prob. 3ECh. 9.2 - Prob. 4ECh. 9.2 - Prob. 5ECh. 9.2 - Prob. 6ECh. 9.2 - Prob. 7ECh. 9.2 - Prob. 8ECh. 9.2 - Prob. 9ECh. 9.2 - Prob. 10E
Ch. 9.2 - Prob. 11ECh. 9.2 - Prob. 12ECh. 9.2 - Prob. 13ECh. 9.2 - Prob. 14ECh. 9.2 - Prob. 15ECh. 9.2 - Prob. 16ECh. 9.2 - Prob. 17ECh. 9.2 - Prob. 18ECh. 9.2 - Prob. 19ECh. 9.2 - Prob. 20ECh. 9.2 - Prob. 21ECh. 9.2 - Prob. 22ECh. 9.2 - Prob. 23ECh. 9.2 - Prob. 24ECh. 9.3 - Prob. 1ECh. 9.3 - Prob. 2ECh. 9.3 - Prob. 3ECh. 9.3 - Prob. 4ECh. 9.3 - Prob. 5ECh. 9.3 - Prob. 6ECh. 9.3 - Prob. 7ECh. 9.3 - Prob. 8ECh. 9.3 - Prob. 9ECh. 9.3 - Prob. 10ECh. 9.3 - Prob. 11ECh. 9.3 - Prob. 12ECh. 9.3 - Prob. 13ECh. 9.3 - Prob. 14E
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