Esterification

Overview

Methanol attacks an acid-activated carbonyl; proton transfers and water loss give methyl acetate. The ester oxygen linking to the methyl group comes from the alcohol.

Transformation

Methanol → Methyl acetate

Equation

CH3COOH + CH3OH <=> CH3COOCH3 + H2O

Reactants

Ethanoic acid + Methanol

Products

Methyl acetate + Water

Reagents

Ethanoic acid; H2SO4 catalyst

Environment

Warm with acid catalyst; reversible equilibrium

Reaction class

Esterification

Mechanism

acid-catalysed nucleophilic acyl substitution

Evidence level

source-backed molecular example

Scope and limitations

Scope

Methanol supplies the ester methoxy group; ethanoic acid supplies the acyl group.

Limitations

Ethanoic acid is required. Water content and reactant proportions affect equilibrium; no complete conversion is implied.

Related reactions

• Catalytic oxidation: Methanol → Methanal

  Removing hydrogen from methanol creates a carbonyl while retaining its single carbon. Oxygen accepts the removed hydrogen as water in this overall catalytic-oxidation equation.

• Carbonyl reduction: Methanal → Methanol

  Hydride addition forms a new C-H bond and converts the C=O pi bond into an alkoxide. Protonation then gives methanol without introducing another carbon.

• Acid hydrolysis: Methyl acetate → Ethanoic acid

  Water adds to the protonated ester carbonyl. Proton transfer allows methanol to leave as the carbonyl reforms, producing the acid and alcohol together.

• Acid hydrolysis: Methyl acetate → Methanol

  Water adds to the protonated ester carbonyl. Proton transfer allows methanol to leave as the carbonyl reforms, producing the acid and alcohol together.

References

1. Organic Chemistry: Reactions of Carboxylic AcidsJohn McMurry · OpenStax Organic Chemistry · 2023

   Checked 2026-09-16. Supports the reaction pattern and mechanistic explanation; named examples apply that scope to existing molecular records without claimed experimental yields.