(a)
Interpretation:
The complete and detailed mechanism for the given reaction is to be drawn, and the overall product of the reaction is to be predicted.
Concept introduction:
This is saponifiaction reaction. A
The irreversible deprotonation in Step 3 makes the overall saponification reaction irreversible. The initial carboxylic acid is produced reversibly, but it is continually removed via Step 3, which helps drive the reaction to completion.
(b)
Interpretation:
The complete and detailed mechanism for the given reaction is to be drawn, and the overall product of the reaction is to be predicted.
Concept introduction:
This is saponifiaction reaction. A carboxylic acid is produced when an ester undergoes saponification, followed by acid workup. Steps 1 and 2 are identical to the nucleophilic addition and elimination steps. Step 3 is the rapid, irreversible deprotonation of the newly formed carboxylic acid. Finally, the proton is replenished by adding a strong acid.
The irreversible deprotonation in Step 3 makes the overall saponification reaction irreversible. The initial carboxylic acid is produced reversibly, but it is continually removed via Step 3, which helps drive the reaction to completion.

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Chapter 20 Solutions
Organic Chemistry: Principles And Mechanisms
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- Part I. Draw reaction mechanism for the transformations of benzophenone to benzopinacol to benzopinaco lone and answer the ff: Pinacol (2,3-dimethyl, 1-3-butanediol) on treatment w/ acid gives a mixture of pina colone and (3,3-dimethyl-2-butanone) 2,3-dimethyl-1,3-butadiene. Give reasonable mechanism the formation of the products Forarrow_forwardShow the mechanism for these reactionsarrow_forwardDraw the stepwise mechanismarrow_forward
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