Eugenol - C10H12O2

What is Eugenol?

Eugenol is a weakly acidic phenolic compounds with a chemical formula C10H12O2. It is an allylic substituted guaiacol which is pale yellow oily liquid. It is one of the most important compounds present in clove has a pleasant, spicy, clove like odour. Eugenol (4-allyl-2-methoxyphenol) exhibits antioxidant, antiseptic, and antimicrobial activity properties. Eugenol is one of the reduced phenylpropanoids, a major component of clove oil.

Other name – 2-methoxy-4-prop-2-enylphenol, 4-Allyl-2-methoxyphenol

C10H12O2 Eugenol
Density 1.06 g/cm³
Molecular Weight/ Molar Mass 164.2 g/mol
Boiling Point 254 °C
Melting Point -7.5 °C
Chemical Formula C10H12O2

Eugenol Structure – C10H12O2


Physical Properties of Eugenol – C10H12O2

Odour Odor of cloves
Appearance Pale yellow aromatic oily liquid
Complexity 145
Vapour Pressure Approximately 4 torr
Hydrogen Bond Donor 1
Solubility Miscible with alcohol, ether, chloroform and oils

Chemical Properties of Eugenol – C10H12O2

C10H12O2 + FeCl3 → C10H9O2Fe + 3HCl

    • Eugenol reacts with bromine forms 1,3 – Dibromobutyl benzene and oxygen. The chemical reaction is as follows.

C10H12O2 + Br2 → C10H12Br2 + O2

Uses of Eugenol – C10H12O2

  • Used as Food Flavouring Clove is very aromatic, has a fine flavour and imparts warming qualities.
  • Used as an inhibitor for additional polymerizing resins and can interfere with subsequent use of resin cements.
  • Used as a dental obtundent by dentist and as a topical anesthetic used extensively to replace clove oil.
  • Zinc oxide eugenol cement is one of the oldest used cements. It is only a mild irritant to the pulp, less soluble in oral fluids and produce better marginal seal.

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