Menthol Crystals

Menthol is an organic compound made synthetically or obtained from corn mint, peppermint, or other mint oils. It is a waxy, crystalline substance, clear or white in color, which is solid at room temperature and melts slightly above. The main form of menthol occurring in nature is (−)-menthol, which is assigned the (1R,2S,5R) configuration. Menthol has local anesthetic and counterirritant qualities, and it is widely used to relieve minor throat irritation. Menthol also acts as a weak kappa opioid receptor agonist.

Parameter Value

CAS Number

2216-51-5 (chiral) 
89-78-1 (racemic) 

Chemical formula

C10H20O

Molar mass

156.27 g·mol−1

Appearance

White or colorless crystalline solid

Density

0.890 g·cm−3, solid
(racemic or (−)-isomer)

Melting point

36 to 38 °C (97 to 100 °F; 309 to 311 K) racemic
42–45 °C, (−)-isomer, α crystalline form

Boiling point

212 °C (414 °F; 485 K)

Solubility in water

Slightly soluble, (−)-isomer

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