
Concept explainers
(a)
Interpretation:
The major product of the given reaction should be drawn.
Concept introduction:
Ring-opening of
Acid-catalyzed ring-opening of epoxide: The epoxide ring is protonated and the nucleophile attack depends on the electronic or steric effect (nature of epoxide).
Regiochemistry: When the epoxide is unsymmetrical, the nucleophile attack at the more substituted position of the protonated epoxide ring.
Stereochemistry: when the nucleophile attack takes place at chiral center, an inversion of configuration is obtained.
Base catalyzed ring opening of epoxide:
The nucleophile will attack at the less substituted position under basic conditions and then the alkoxide ion gets proton from alcohol which form the product.
(b)
Interpretation:
The major product of the given reaction should be drawn.
Concept introduction:
Ring-opening of epoxide: The epoxide ring is highly strain and readily undergoes reaction with strong nucleophile result in the ring-opening reaction.
Acid-catalyzed ring-opening of epoxide: The epoxide ring is protonated and the nucleophile attack depends on the electronic or steric effect (nature of epoxide).
Regiochemistry: When the epoxide is unsymmetrical, the nucleophile attack at the more substituted position of the protonated epoxide ring.
Stereochemistry: when the nucleophile attack takes place at chiral center, an inversion of configuration is obtained.
Base catalyzed ring opening of epoxide:
The nucleophile will attack at the less substituted position under basic conditions and then the alkoxide ion gets proton from alcohol which form the product.
(c)
Interpretation:
The major product of the given reaction should be drawn.
Concept introduction:
Ring-opening of epoxide: The epoxide ring is highly strain and readily undergoes reaction with strong nucleophile result in the ring-opening reaction.
Acid-catalyzed ring-opening of epoxide: The epoxide ring is protonated and the nucleophile attack depends on the electronic or steric effect (nature of epoxide).
Regiochemistry: When the epoxide is unsymmetrical, the nucleophile attack at the more substituted position of the protonated epoxide ring.
Stereochemistry: when the nucleophile attack takes place at chiral center, an inversion of configuration is obtained.
Base catalyzed ring opening of epoxide:
The nucleophile will attack at the less substituted position under basic conditions and then the alkoxide ion gets proton from alcohol which form the product.
(d)
Interpretation:
The major product of the given reaction should be drawn.
Concept introduction:
Ring-opening of epoxide: The epoxide ring is highly strain and readily undergoes reaction with strong nucleophile result in the ring-opening reaction.
Acid-catalyzed ring-opening of epoxide: The epoxide ring is protonated and the nucleophile attack depends on the electronic or steric effect (nature of epoxide).
Regiochemistry: When the epoxide is unsymmetrical, the nucleophile attack at the more substituted position of the protonated epoxide ring.
Stereochemistry: when the nucleophile attack takes place at chiral center, an inversion of configuration is obtained.
Base catalyzed ring opening of epoxide:
The nucleophile will attack at the less substituted position under basic conditions and then the alkoxide ion gets proton from alcohol which form the product.

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Chapter 9 Solutions
EBK ESSENTIAL ORGANIC CHEMISTRY
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