|Jmol 3D model||Interactive image|
|Molar mass||74.12 g·mol−1|
|Melting point||25 to 26 °C; 77 to 79 °F; 298 to 299 K|
|Boiling point||82 to 83 °C; 179 to 181 °F; 355 to 356 K|
|Vapor pressure||4.1 kPa (at 20 °C)|
|Acidity (pKa)||16.54 |
Refractive index (nD)
|215.37 J K−1 mol−1|
|189.5 J K−1 mol−1|
Std enthalpy of
|−360.04–−358.36 kJ mol−1|
Std enthalpy of
|−2.64479–−2.64321 MJ mol−1|
|Safety data sheet||inchem.org|
|GHS signal word||DANGER|
|H225, H319, H332, H335|
|P210, P261, P305+351+338|
EU classification (DSD)
|R-phrases||R11, R20, R36/37|
|S-phrases||(S2), S9, S16, S46|
|Flash point||11 °C (52 °F; 284 K)|
|480 °C (896 °F; 753 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|3559 mg/kg (rabbit, oral)
3500 mg/kg (rat, oral)
|US health exposure limits (NIOSH):|
|TWA 100 ppm (300 mg/m3)|
|TWA 100 ppm (300 mg/m3) ST 150 ppm (450 mg/m3)|
IDLH (Immediate danger)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
tert-Butyl alcohol (TBA), also called tert-butanol, is the simplest tertiary alcohol, with a formula of (CH3)3COH (sometimes represented as t-BuOH). It is one of the four isomers of butanol. tert-Butyl alcohol is a colorless solid, which melts near room temperature and has a camphor-like odor. It is very soluble in water and miscible with ethanol and diethyl ether.
tert-Butyl alcohol is derived commercially from isobutane as a co-product of propylene oxide production. It can also be produced by the catalytic hydration of isobutylene, or by a Grignard reaction between acetone and methylmagnesium chloride.
When produced from aqueous media, samples consist of 88.24 per cent alcohol, with the remainder as water that cannot be removed by distillation. Instead, the anhydrous alcohol requires drying agent such as calcium oxide.
tert-Butyl alcohol is used as a solvent, ethanol denaturant, paint remover ingredient, and gasoline octane booster and oxygenate. It is a chemical intermediate used to produce MTBE and ETBE by reaction with methanol and ethanol, and TBHP by reaction with hydrogen peroxide.
As a tertiary alcohol, tert-butyl alcohol is more resistant to oxidation and less reactive than the other isomers of butanol.
When tert-butyl alcohol is deprotonated with a strong base, the product is an alkoxide anion. In this case, it is tert-butoxide. For example, the commonly used organic reagent potassium tert-butoxide is prepared by refluxing dry tert-butanol with potassium metal.
- K + tBuOH → tBuO−K+ + 0.5 H2
The tert-butoxide is a strong, non-nucleophilic base in organic chemistry. It readily abstracts acidic protons from substrates, but its steric bulk inhibits the group from participating in nucleophilic substitution, such as in a Williamson ether synthesis or an SN2 reaction.
- "tert-Butyl Alcohol - Compound Summary". PubChem Compound. National Center for Biotechnology Information. 2005-03-26. Retrieved 2012-05-19.
- "NIOSH Pocket Guide to Chemical Hazards #0078". National Institute for Occupational Safety and Health (NIOSH).
- Reeve, W.; Erikson, C.M.; Aluotto, P.F. Can. J. Chem, 1979, 57, 2747.
- "Tert-Butyl alcohol". Immediately Dangerous to Life and Health. National Institute for Occupational Safety and Health (NIOSH).
- James F. Norris and Alanson W. Olmsted "tert-Butyl Chloride" Org. Synth. 1928, volume 8, pp. 50. doi:10.15227/orgsyn.008.0050
- Johnson, W. S.; Schneider, W. P. (1950). "β-Carbethoxy-γ,γ-diphenylvinylacetic acid". Org. Synth. 30: 18.; Coll. Vol. 4, p. 132