Concept explainers
(a)
Interpretation:
How UV-vis spectroscopy could be used to determine whether the given reaction has actually taken place or not is to be suggested with reason.
Concept introduction:
Compounds with lone pairs tend to have longer-wavelength absorptions than analogous compounds without lone pairs. The longest
Answer to Problem 15.36P
The given reaction will take place as suggested by change in the
Explanation of Solution
The given reaction is:
In the above reaction, both the reactant and product have two double bonds; in the product, both double bonds are in conjugation, but in the reactant, they are not.
Thus, we can say that the given reaction has actually occurred.
Whether the given reaction has actually taken place is suggested on the basis of conjugation in the product and its effect on
(b)
Interpretation:
How UV-vis. Spectroscopy could be used to determine whether the given reaction has actually taken place or not is to be suggested with reason.
Concept introduction:
Compounds with lone pairs tend to have longer-wavelength absorptions than analogous compounds without lone pairs. The longest
Answer to Problem 15.36P
The given reaction does not occur as given, since the
Explanation of Solution
The given reaction is:
In the above reaction, the reactant has two double bonds in conjugation, and the product has only one double bond. Thus,
Thus, we can say that the given reaction does not take place.
Whether the given reaction has actually taken place is suggested on the basis of conjugation in the product and its effect on
(c)
Interpretation:
How UV-vis. Spectroscopy could be used to determine whether the given reaction has actually taken place or not is to be suggested with reason.
Concept introduction:
Compounds with lone pairs tend to have longer-wavelength absorptions than analogous compounds without lone pairs. The longest
Answer to Problem 15.36P
The given reaction not take place as given, since the
Explanation of Solution
The given reaction is:
In the above reaction, the reactant has three double bonds in conjugation, and the product has two double bonds not in conjugation. The value of the longest-wavelength
Thus,
Whether the given reaction actually took is suggested on the basis of conjugation in the product and its effect on
(d)
Interpretation:
How UV-vis. Spectroscopy could be used to determine whether the given reaction has actually taken place or not is to be suggested with reason.
Concept introduction:
Compounds with lone pairs tend to have longer-wavelength absorptions than analogous compounds without lone pairs. The longest
Answer to Problem 15.36P
The given reaction will take place as suggested by change in the
Explanation of Solution
The given reaction is:
In the above reaction, both reactant and product have three triple bonds in conjugation, but the reactant has a lone pair. So, the reactant’s longest-wavelength absorption corresponds to a
Therefore the
Whether the given reaction actually took is suggested on the basis of conjugation in the product and its effect on
(e)
Interpretation:
How UV-vis. Spectroscopy could be used to determine whether the given reaction actually took is to be suggested with reason.
Concept introduction:
Compounds with lone pairs tend to have longer-wavelength absorptions than analogous compounds without lone pairs. The longest
Answer to Problem 15.36P
The given reaction will take place as suggested by change in the
Explanation of Solution
The given reaction is:
In the above reaction, the reactant has three conjugated bonds, and the product has four conjugated double bonds.
Thus, we can say that the given reaction is actually took place.
Whether the given reaction actually took is suggested on the basis of conjugation in the product and its effect on
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Chapter 15 Solutions
Organic Chemistry: Principles and Mechanisms (Second Edition)
- take a look at this reaction (first image) The second image shows the 1H NMR spectrum of the compound that was isolated as only product of this reaction: How you can use the 1H NMR spectrum to establish if Product A or Product B was formed in this reaction? Explain your reasoning.arrow_forwardWhy is it important for solutions to be diluted before they are run through spectroscopy?arrow_forward10) Which type of spectroscopy would be best/easiest to distinguish between these two compoundsarrow_forward
- Take a look at the reaction in the first image that give two products A and B The second picture shows the DEPT 90 (TOP) and DEPT 135 (BOTTOM) of the compound that was isolated as only product of this reaction: In both spectra there are 7 signals between 120 and 140 ppm. How can you use these DEPT spectra to establish if product A or product B was formed in this reaction? Explain your reasoning.arrow_forwardWhy is this the correct spectra for these molecules. Identify a specific absorption band which identifies each characteristic functional group of the molecule chosen.arrow_forwardWhat are some of the advantages and limitations of mass spectroscopy?arrow_forward
- What is the reactant and the desired product? If you were looking at both of the IR spectrum, where would you confirm that the desired reaction had occured.arrow_forwardExplain why these are the correct spectra for the molecules. Identify a specific absorption band which identifies each characteristic functional group of the molecule chosen.arrow_forwardWhen compounds are prepared for IR analysis, they usually have to be dehydrated completely and then dissolved in a solvent other than water. Can you think of a reason why you might not want to have any H2O mixed in with your unknown compound when collecting its IR absorbance? Explain your rationale with respect to any observations about the spectra.arrow_forward
- Reaction progress is one of the most difficult task in organic synthesis describe how IR spectroscopy could be used to determine when each reaction is completearrow_forwardHow could spectroscopy be used to support that the below reaction occurred? Choose all that apply.arrow_forwardDefine fluorescence spectroscopyarrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning