An organic compound formed by the reaction of a carboxylic acid with an alcohol, releasing water (condensation reaction). Esters have the general formula RCOOR'. They are often fragrant and are found in fruits, perfumes, and fats. Hydrolysis of esters reverses the esterification.
Other Names / Synonyms: Organic ester, Fruit ester
Properties & Characteristics
Formed by condensation of carboxylic acid and alcohol with H₂SO₄ catalyst. General formula RCOOR'. Hydrolysis (saponification with base) reverses reaction. Common esters: ethyl acetate (CH₃COOC₂H₅, solvent), methyl salicylate (wintergreen oil), isoamyl acetate (banana flavor), octyl acetate (orange flavor), glycerol triesters (fats and oils — triglycerides). Physical: distinctive fruity/floral odors, lower bp than parent acid, immiscible with water (except small esters).
Uses & Applications
Natural flavors and fragrances in food, perfumes, and cosmetics. Industrial solvents: ethyl acetate, butyl acetate (paints, adhesives, nail polish removers). Plasticizers: phthalate esters. Biodiesel production (fatty acid methyl esters from vegetable oils). Pharmaceutical esters improve drug bioavailability. Polyesters (PET, Dacron) for textiles and plastic bottles. Aspirin (acetylsalicylic acid) is an ester.
Safety Information
Many esters are flammable solvents (ethyl acetate flash point 4°C, highly flammable). Vapors can cause headache, dizziness, and narcosis at high concentrations. Phthalate plasticizers are endocrine disruptors — regulatory concern. Methanol-derived esters are toxic due to methanol release on hydrolysis. Handle with ventilation; avoid ignition sources.
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
An organic compound formed by the reaction of a carboxylic acid with an alcohol, releasing water (condensation reaction). Esters have the general formula RCOOR'. They are often fragrant and are found in fruits, perfumes, and fats. Hydrolysis of esters reverses the esterification.
Natural flavors and fragrances in food, perfumes, and cosmetics. Industrial solvents: ethyl acetate, butyl acetate (paints, adhesives, nail polish removers). Plasticizers: phthalate esters. Biodiesel production (fatty acid methyl esters from vegetable oils). Pharmaceutical esters improve drug bioava…
Many esters are flammable solvents (ethyl acetate flash point 4°C, highly flammable). Vapors can cause headache, dizziness, and narcosis at high concentrations. Phthalate plasticizers are endocrine disruptors — regulatory concern. Methanol-derived esters are toxic due to methanol release on hydrolys…
The formula or notation for Ester is: R-COOH + R'-OH ⇌ R-COOR' + H₂O (Fischer esterification)
Editorial standards: Chemical data is sourced from peer-reviewed literature,
CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA,
and IAEA. For educational purposes only — always consult official SDS documentation and qualified
professionals before handling chemicals.
