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Questions and Answers
What is the main organic product of Claisen condensation?
What is the main organic product of Claisen condensation?
β-keto ester
What is the main organic product obtained by the reduction of acid derivatives with LiAlH4?
What is the main organic product obtained by the reduction of acid derivatives with LiAlH4?
Primary alcohol
What is the main organic product when acid derivatives react with organometallic reagents?
What is the main organic product when acid derivatives react with organometallic reagents?
Ketone
What is the main product formed in the formation of thioacetals?
What is the main product formed in the formation of thioacetals?
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_______ condensation involves the reaction of two carbonyl compounds in the presence of a base.
_______ condensation involves the reaction of two carbonyl compounds in the presence of a base.
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Study Notes
Organic Chemistry Reactions
Claisen Condensation
- Two molecules of an ester react to form a β-keto ester
- Example: CH₃CH₂COOCH₃ + CH₃CH₂OH → β-keto ester
Reduction of Acid Derivatives
- Reaction with LiAlH₄: R-C(=O)-OR → RCH₂OH + ROH
- Example: C₆H₅COOCH₃ + LiAlH₄ → C₆H₅CH₂OH + CH₃OH
Reduction of Acid Derivatives with Organometallic Reagents
- Reaction with R'-MgBr: R-C(=O)-Y → R-C(=O)-R' + Y-
- Example: C₆H₅COCH₃ + CH₃MgBr → C₆H₅C(CH₃)₂ + CH₃Br
Sulphur Nucleophiles
- Formation of thioacetals: R-C(=O) + RSH → R-C-SR
- Examples:
- CH₃C-H + H₃CCH₂SH₂ → CH₃C-SCH₂CH₃
- CH₃CH₂CH₂C-CH₃ + C₆H₅SH → CH₃CH₂CH₂C-SC₆H₅
Cross Aldol Condensation
- Reaction: O + 2 OH- → O
- Example: OH + 2 OH- → O
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