|Boiling Point:||263.6°C At 760 MmHg||Flash Point:||118.4°C|
128-37-0 Butylated Hydroxytoluene,
C15H24O Butylated Hydroxytoluene
128-37-0 C15H24O 263.6°C at 760 mmHg insoluble
Product name: 2,6-Di-tert-butyl-4-methylphenol
The chemical synthesis of BHT in industry has involved the reaction of p-cresol (4-methylphenol) with isobutylene (2-methylpropene), catalyzed by sulfuric acid:
CH3(C6H4)OH + 2 CH2=C(CH3)2 → ((CH3)3C)2CH3C6H2OH
Alternatively, BHT has been prepared from 2,6-di-tert-butylphenol by hydroxymethylation or aminomethylation followed by hydrogenolysis.
The species behaves as a synthetic 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
CAS RN: 128-37-0
EINECS No.: 204-881-4
Molecular formula: C15H24O
Molecular weight: 220.3505
Melting point: 69-71℃
Boiling point: 263.6°C at 760 mmHg
Flash point: 118.4°C
Vapor pressure: 0.00624mmHg at 25°C
|Melting point||69-73 °C(lit.)|
|Boiling point||265 °C(lit.)|
|vapor density||7.6 (vs air)|
|vapor pressure||<0.01 mm Hg ( 20 °C)|
|FEMA||2184 | BUTYLATED HYDROXYTOLUENE|
|solubility||methanol: 0.1 g/mL, clear, colorless|
|pka||pKa 14(H2O t = 25 c = 0.002 to 0.01) (Uncertain)|
|Odor||faint characteristic odor|
|Stability:||Stable, but light-sensitive. Incompatible with acid chlorides, acid anhydrides, brass, copper, copper alloys, steel, bases, oxidizing agents. Combustible.|
|CAS DataBase Reference||128-37-0(CAS DataBase Reference)|
|IARC||3 (Vol. 40, Sup 7) 1987|
|NIST Chemistry Reference||Butylated hydroxytoluene(128-37-0)|
|EPA Substance Registry System||2,6-Di-tert-butyl-p-cresol (128-37-0)|
|Autoignition Temperature||878 °F|
|Hazardous Substances Data||
128-37-0(Hazardous Substances Data)
|Toxicity||LD50 orally in mice: 1040 mg/kg (McOmie)|
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