a)
Interpretation:
The electron pushing mechanism for the formation of the organo-mercury intermediate obtained during the mercury catalyzed hydration of phenylacetylene is to be drawn.
Concept introduction:
In the first step attack of the π electrons of the triple bond on the electrophilic Hg2+ ion takes place to yield a mercury containing vinylic carbocation intermediate. In the second step nucleophilic attack of water takes place on the carbocation. A new C-O bond is formed leading to the formation of a protonated mercury containing enol. In the third step water abstracts a proton from the protonated enol to yield the organomercury intermediate.
To draw:
The electron pushing mechanism for the formation of the organo-mercury intermediate obtained during the mercury catalyzed hydration of ethynylbenzene.
b)
Interpretation:
The electron pushing mechanism for the formation of the organo-mercury intermediate obtained during the mercury catalyzed hydration of propyne is to be drawn.
Concept introduction:
In the first step attack of the π electrons of the triple bond on the electrophilic Hg2+ ion takes place to yield a mercury containing vinylic carbocation intermediate. In the second step nucleophilic attack of water takes place on the carbocation. A new C-O bond is formed leading to the formation of a protonated mercury containing enol. In the third step water abstracts a proton from the protonated enol to yield the organomercury intermediate.
To draw:
The electron pushing mechanism for the formation of the organo-mercury intermediate obtained during the mercury catalyzed hydration of propyne.
c)
Interpretation:
The electron pushing mechanism for the formation of the organo-mercury intermediate obtained during the mercury catalyzed hydration of 3-methyl-1-butyne is to be drawn.
Concept introduction:
In the first step attack of the π electrons of the triple bond on the electrophilic Hg2+ ion takes place to yield a mercury containing vinylic carbocation intermediate. In the second step nucleophilic attack of water takes place on the carbocation. A new C-O bond is formed leading to the formation of a protonated mercury containing enol. In the third step water abstracts a proton from the protonated enol to yield the organomercury intermediate.
To draw:
The electron pushing mechanism for the formation of the organo-mercury intermediate obtained during the mercury catalyzed hydration of 3-methyl-1-butyne.
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Chapter 9 Solutions
EBK ORGANIC CHEMISTRY
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