
(a)
Interpretation:
The given starting compounds and selective reagents used to accomplish the target products transformation should be draw and identified.
Concept Introduction:
Witting reaction: When an
Witting reaction mechanism:
This attack of phosphorous yield dictates the final product. the pathway with the least steric interaction is favored.
This process allows the preparation of an alkene by the reaction of an aldehyde (
Schematic of the witting Reaction: Witting reagent :(
Elimination Reaction: It is just reverse reaction of addition where substituent from the given molecule is removed via E1 (the reaction depends only on the substrate involved in the reaction) or E2 (the reaction depends on both of the substituents in the reaction) mechanism.
To identify: The reagents used to accomplish the given transformation (a).
(b)
Interpretation:
The given starting compounds and selective reagents used to accomplish the target products transformation should be draw and identified.
Concept Introduction:
Witting reaction: When an aldehyde or ketone is treated with a witting reagent, a carbon – carbon is forming, and giving an alkene that exhibit the newly formed C=C bonding the location of the former carbonyl group.
Witting reaction mechanism:
This attack of phosphorous yield dictates the final product. the pathway with the least steric interaction is favored.
This process allows the preparation of an alkene by the reaction of an aldehyde (
Schematic of the witting Reaction: Witting reagent :(
Elimination Reaction: It is just reverse reaction of addition where substituent from the given molecule is removed via E1 (the reaction depends only on the substrate involved in the reaction) or E2 (the reaction depends on both of the substituents in the reaction) mechanism.
To identify: The reagents used to accomplish the given transformation (a).
(c)
Interpretation:
The given starting compounds and selective reagents used to accomplish the target products transformation should be draw and identified.
Concept Introduction:
Witting reaction: When an aldehyde or ketone is treated with a witting reagent, a carbon – carbon is forming, and giving an alkene that exhibit the newly formed C=C bonding the location of the former carbonyl group.
Witting reaction mechanism:
This attack of phosphorous yield dictates the final product. the pathway with the least steric interaction is favored.
This process allows the preparation of an alkene by the reaction of an aldehyde (
Schematic of the witting Reaction: Witting reagent :(
Elimination Reaction: It is just reverse reaction of addition where substituent from the given molecule is removed via E1 (the reaction depends only on the substrate involved in the reaction) or E2 (the reaction depends on both of the substituents in the reaction) mechanism.
To identify: The reagents used to accomplish the given transformation (a).
(d)
Interpretation:
The given starting compounds and selective reagents used to accomplish the target products transformation should be draw and identified.
Concept Introduction:
Witting reaction: When an aldehyde or ketone is treated with a witting reagent, a carbon – carbon is forming, and giving an alkene that exhibit the newly formed C=C bonding the location of the former carbonyl group.
Witting reaction mechanism:
This attack of phosphorous yield dictates the final product. the pathway with the least steric interaction is favored.
This process allows the preparation of an alkene by the reaction of an aldehyde (
Schematic of the witting Reaction: Witting reagent :(
Elimination Reaction: It is just reverse reaction of addition where substituent from the given molecule is removed via E1 (the reaction depends only on the substrate involved in the reaction) or E2 (the reaction depends on both of the substituents in the reaction) mechanism.
To identify: The reagents used to accomplish the given transformation (a).
(e)
Interpretation:
The given starting compounds and selective reagents used to accomplish the target products transformation should be draw and identified.
Concept Introduction:
Witting reaction: When an aldehyde or ketone is treated with a witting reagent, a carbon – carbon is forming, and giving an alkene that exhibit the newly formed C=C bonding the location of the former carbonyl group.
Witting reaction mechanism:
This attack of phosphorous yield dictates the final product. the pathway with the least steric interaction is favored.
This process allows the preparation of an alkene by the reaction of an aldehyde (
Schematic of the witting Reaction: Witting reagent :(
Elimination Reaction: It is just reverse reaction of addition where substituent from the given molecule is removed via E1 (the reaction depends only on the substrate involved in the reaction) or E2 (the reaction depends on both of the substituents in the reaction) mechanism.
To identify: The reagents used to accomplish the given transformation (a).

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Chapter 20 Solutions
Organic Chemistry, Binder Ready Version
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