Names | |
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Preferred IUPAC name
Butan-2-ol[2] | |
Other names | |
Identifiers | |
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3D model (JSmol)
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773649 1718764 (R) | |
ChEBI | |
ChEMBL | |
ChemSpider | |
DrugBank | |
ECHA InfoCard | 100.001.053 |
EC Number |
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1686 396584 (R) | |
MeSH | 2-butanol |
PubChem CID
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RTECS number |
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UNII |
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UN number | 1120 |
CompTox Dashboard (EPA)
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Properties | |
C4H10O | |
Molar mass | 74.123 g·mol−1 |
Density | 0.808 g cm−3 |
Melting point | −115 °C; −175 °F; 158 K |
Boiling point | 98 to 100 °C; 208 to 212 °F; 371 to 373 K |
290 g/L[3] | |
log P | 0.683 |
Vapor pressure | 1.67 kPa (at 20 °C) |
Acidity (pKa) | 17.6 [4] |
−5.7683×10−5 cm3 mol−1 | |
Refractive index (nD)
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1.3978 (at 20 °C) |
Thermochemistry | |
Heat capacity (C)
|
197.1 J K−1 mol−1 |
Std molar
entropy (S⦵298) |
213.1 J K−1 mol−1 |
Std enthalpy of
formation (ΔfH⦵298) |
−343.3 to −342.1 kJ mol−1 |
Std enthalpy of
combustion (ΔcH⦵298) |
−2.6611 to −2.6601 MJ mol−1 |
Hazards | |
GHS labelling: | |
Warning | |
H226, H319, H335, H336 | |
P261, P305+P351+P338 | |
NFPA 704 (fire diamond) | |
Flash point | 22 to 27 °C (72 to 81 °F; 295 to 300 K) |
405 °C (761 °F; 678 K) | |
Explosive limits | 1.7–9.8% |
Lethal dose or concentration (LD, LC): | |
LCLo (lowest published)
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16,000 ppm (rat, 4 hr) 10,670 ppm (mouse, 3.75 hr) 16,000 ppm (mouse, 2.67 hr)[5] |
NIOSH (US health exposure limits): | |
PEL (Permissible)
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TWA 150 ppm (450 mg/m3)[5] |
REL (Recommended)
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TWA 100 ppm (305 mg/m3) ST 150 ppm (455 mg/m3)[5] |
IDLH (Immediate danger)
|
2000 ppm[5] |
Safety data sheet (SDS) | inchem.org |
Related compounds | |
Related butanols
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n-Butanol Isobutanol tert-Butanol |
Related compounds
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Butanone |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Butan-2-ol, or sec-butanol, is an organic compound with formula CH3CH(OH)CH2CH3. Its structural isomers are 1-butanol, isobutanol, and tert-butanol. 2-Butanol is chiral and thus can be obtained as either of two stereoisomers designated as (R)-(−)-butan-2-ol and (S)-(+)-butan-2-ol. It is normally encountered as a 1:1 mixture of the two stereoisomers — a racemic mixture.
This secondary alcohol is a flammable, colorless liquid that is soluble in three parts water and completely miscible with organic solvents. It is produced on a large scale, primarily as a precursor to the industrial solvent methyl ethyl ketone.
(R)-(−)-2-butanol | (S)-(+)-2-butanol |
Designations such as isopropanol, sec-butanol, and tert-butanol are incorrect because there are no hydrocarbons isopropane, sec-butane, and tert-butane to which the suffix "-ol" can be added; such names should be abandoned. Isopropyl alcohol, sec-butyl alcohol, and tert-butyl alcohol are, however, permissible (see Rule C-201.3) because the radicals isopropyl, sec-butyl, and tert-butyl do exist