This chapter focuses on the study of aldehydes, ketones, and carboxylic acids, which are crucial functional groups in organic chemistry.
Aldehydes, Ketones and Carboxylic Acids - Quick Look Revision Guide
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Key Points
Carbonyl group: >C=O.
The carbonyl group defines aldehydes and ketones, crucial in organic chemistry.
Aldehyde structure: RCHO.
In aldehydes, the carbonyl is at the end, bonded to a hydrogen atom and carbon.
Ketone structure: RC(=O)R'.
In ketones, the carbonyl group is within the carbon chain, flanked by two R groups.
Nomenclature of aldehydes.
Use IUPAC naming; suffix '-al' indicates aldehydes, e.g., ethanal from ethane.
Nomenclature of ketones.
Use IUPAC naming; suffix '-one' indicates ketones, e.g., propan-2-one from propane.
Physical properties: Polarity.
Aldehydes and ketones are polar, resulting in higher boiling points vs. hydrocarbons.
Hydrogen bonding: Solubility.
Lower aldehydes and ketones are soluble in water due to hydrogen bonding.
Oxidation of primary alcohols to aldehydes.
Primary alcohols oxidized to aldehydes using agents like PCC or CrO₃.
Oxidation of secondary alcohols to ketones.
Secondary alcohols oxidized to ketones via the same oxidizing agents mentioned.
Nucleophilic addition: General reaction.
Nucleophiles attack electrophilic carbon of the carbonyl group, forming an alcohol.
Aldol condensation: β-hydroxyaldehyde.
Under basic conditions, aldehydes/ketones with a-hydrogens combine to form aldols.
Cannizzaro reaction: Aldehyde oxidation.
Aldehydes without a-hydrogens disproportionate in strong base to produce alcohol and acid.
Reduction of ketones and aldehydes.
Reduced to alcohols using NaBH₄ or LiAlH₄, which are key reactions in organic synthesis.
Distinguishing tests: Tollens' and Fehling's.
Aldehydes reduce Tollens' reagent to silver; they also react with Fehling's solution.
Carboxylic acids: Structure RCOOH.
Carboxylic acids contain a carbonyl and hydroxyl group, resulting in high acidity.
Preparation of carboxylic acids.
Oxidation of primary alcohols/aldehydes, or hydrolysis of nitriles produces carboxylic acids.
Acidity of carboxylic acids: Increased with EWG.
Electron-withdrawing groups increase the acidity by stabilizing the carboxylate ion.
Esterification: RCOOH + R'OH.
Reacts with alcohols in presence of acid catalyst to form esters via nucleophilic substitution.
Haloform reaction: Methyl ketones.
Oxidation of methyl ketones produces carboxylic acids and haloforms through strong oxidants.
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