Chemical structure of BHT
| IUPAC name
| Other names
Additin RC 7110
|Molar mass||220.356 g/mol|
|Appearance||White to yellow powder|
|Melting point||70 °C (158 °F; 343 K)|
|Boiling point||265 °C (509 °F; 538 K)|
|1.1 mg/L (20 °C)|
|Solubility|| Soluble in acetone, benzene, cyclohexane, ethanol, heptane, hexane,isopropanol, methanol, methyl cellosolve, methyl ethyl ketone, petroleum ether, toluene, vegetable oil|
Insoluble in propylene glycol
|Vapor pressure||0.01 mmHg (20°C)|
Std enthalpy of
|Safety data sheet||Sigma-Aldrich|
|Flash point||127 °C (261 °F; 400 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|2,000 mg/kg (rat, dermal)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Butylated hydroxytoluene (BHT), also known as dibutylhydroxytoluene, is an organic compound, chemically a derivative of phenol, widely for its antioxidant properties, such as preservative for many reagents and other products.
BHT acts as a synthetic structural analog of vitamin E, primarily acting as a terminating agent that suppresses autoxidation, a process whereby unsaturated (usually) organic compounds are attacked by atmospheric oxygen. BHT stops this autocatalytic reaction by converting peroxy radicals to hydroperoxides. It effects this function by donating a hydrogen atom:
- RO2• + ArOH → ROOH + ArO•
- RO2• + ArO• → nonradical products
BHT is a white to yellowish crystalline solid insoluble in water, with a phenolic odor.
BHT is sold by chemical suppliers.
Phytoplankton, including the green algae Botryococcus braunii, as well as three different cyanobacteria (Cylindrospermopsis raciborskii, Microcystis aeruginosa and Oscillatoria sp.) are capable of producing minute amounts of BHT.
Industrially, BHT is prepared by the reaction of p-cresol (4-methylphenol) with isobutylene (2-methylpropene), catalyzed by conc. sulfuric acid:
- CH3(C6H4)OH + 2 CH2=C(CH3)2 → ((CH3)3C)2CH3C6H2OH
- Reagent preservative
BHT is considered to posses low toxicity.
BHT should be kept in air-tight containers.
No special disposal is required. Should be strongly diluted and poured down the drain.