Textbook Question
Give the structures of the intermediates represented by letters O, P, and Q in this synthesis.
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13. Alcohols and Carbonyl Compounds
Protecting Alcohols from Organometallics
Multiple Choice
When are acetal protecting groups important in synthesis?
A
When a reaction is disfavored by entropy.
B
When a reaction is disfavored by enthalpy.
C
When the reaction temperature would otherwise be too high and the product might decompose.
D
When the reagent will react with an aldehyde or ketone instead of the desired functional group.
Verified step by step guidance1
Understand the role of acetal protecting groups: Acetal protecting groups are used in organic synthesis to temporarily mask the reactivity of aldehydes or ketones, preventing them from participating in unwanted side reactions.
Identify the functional groups involved: In a synthesis problem, identify if there are aldehydes or ketones present that might interfere with the desired reaction pathway.
Consider the reaction conditions: Evaluate the conditions under which the synthesis is taking place. If the reagent used in the reaction can react with aldehydes or ketones, acetal protecting groups can be used to prevent this.
Apply acetal formation: To protect an aldehyde or ketone, convert it into an acetal by reacting it with an alcohol in the presence of an acid catalyst. This transformation will make the carbonyl group less reactive.
Plan for deprotection: After the desired reaction is complete, remove the acetal protecting group by hydrolysis, typically using aqueous acid, to regenerate the original aldehyde or ketone.
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