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
|Molecular Weight/ Molar Mass||164.2 g/mol|
|Boiling Point||254 °C|
|Melting Point||-7.5 °C|
Eugenol Structure – C10H12O2
Physical Properties of Eugenol – C10H12O2
|Odour||Odor of cloves|
|Appearance||Pale yellow aromatic oily liquid|
|Vapour Pressure||Approximately 4 torr|
|Hydrogen Bond Donor||1|
|Solubility||Miscible with alcohol, ether, chloroform and oils|
Chemical Properties of Eugenol – C10H12O2
- Eugenol readily undergo double displacement reaction with Iron(III) chloride. The reaction is as below.
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.