2,3-Butanediol
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Names | |
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IUPAC name
Butane-2,3-diol | |
Other names
2,3-Butylene glycol Dimethylene glycol 2,3-Dihydroxybutane Butan-2,3-diol Diethanol & Bis-ethanol | |
Identifiers | |
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3D model (JSmol) |
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.007.431 |
EC Number | 208-173-6 |
PubChem CID |
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Properties | |
C4H10O2 | |
Molar mass | 90.12 g·mol−1 |
Appearance | Colorless liquid |
Odor | odorless |
Density | 0.987 g/mL |
Melting point | 19 °C (66 °F; 292 K) |
Boiling point | 177 °C (351 °F; 450 K) |
Miscible | |
Solubility in other solvents | Soluble in alcohol, ketones, ether |
log P | -0.92 |
Vapor pressure | 0.23 hPa (20 °C) |
Acidity (pKa) | 14.9 |
Refractive index (nD) |
1.4366 |
Thermochemistry | |
Heat capacity (C) |
213.0 J/K mol |
Std enthalpy of formation (ΔfH |
-544.8 kJ/mol |
Hazards | |
EU classification (DSD) (outdated) |
Flammable (F) |
R-phrases (outdated) | R11 |
S-phrases (outdated) | (S2) S7 S16 |
NFPA 704 | |
Flash point | 85 °C (185 °F; 358 K) |
402 °C (756 °F; 675 K) | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
5462 mg/kg (rat, oral) |
Related compounds | |
Related butanediols |
1,4-Butanediol 1,3-Butanediol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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Infobox references | |
2,3-Butanediol is a chemical compound with the molecular formula C4H10O2. It has three stereoisomers, all of which are colorless, viscous liquids. It occurs naturally upon the fermentation of sugarcane molasses.[1] Applications include precursors to various plastics and pesticides.
Isomerism
Of the three stereoisomers, two are enantiomers (levo- and dextro-2,3-butanediol) and one is a meso compound.[2][3] The enantiomeric pair have (2R, 3R) and (2S, 3S) configurations at carbons 2 and 3, while the meso compound has configuration (2R, 3S) or, equivalently, (2S, 3R).
Industrial production and uses
2,3-Butanediol is prepared by hydrolysis of 2,3-butene oxide:[4]
- (CH3CH)2O + H2O → CH3(CHOH)2CH3
The isomer distribution depends on the stereochemistry of the epoxide.
The meso isomer is used to combine with naphthalene-1,5-diisocyanate. The resulting polyurethane is called "Vulkollan".[4]
Biological production
The (2R,3R)-stereoisomer of 2,3-butanediol is produced by a variety of microorganisms in a process known as butanediol fermentation.[5] It is found naturally in cocoa butter, in the roots of Ruta graveolens, sweet corn, and in rotten mussels. It is used in the resolution of carbonyl compounds in gas chromatography.[6]
During World War II research was done towards producing 2,3-butanediol by fermentation in order to produce 1,3-butadiene, the monomer of the polybutadiene used in a leading type of synthetic rubber.[7]
Reactions
2,3-Butanediol can undergo dehydration to form butanone (methyl ethyl ketone):[8]
- CH3(CHOH)2CH3 → CH3C(O)CH2CH3 + H2O
It can also undergo deoxydehydration to form butene:[9]
- CH3(CHOH)2CH3 + (reductant) → C4H8
References
- ↑ Dai, Jian-Ying; Zhao, Pan; Cheng, Xiao-Long; Xiu, Zhi-Long (2015). "Enhanced Production of 2,3-Butanediol from Sugarcane Molasses". Applied Biochemistry and Biotechnology. 175 (6): 3014–3024. doi:10.1007/s12010-015-1481-x. ISSN 0273-2289.
- ↑ Boutron P (1992). "Cryoprotection of red blood cells by a 2,3-butanediol containing mainly the levo and dextro isomers". Cryobiology. 29 (3): 347–358. PMID 1499320.
- ↑ Wang Y, Tao F, Xu P (2014). "Glycerol dehydrogenase plays a dual role in glycerol metabolism and 2,3-butanediol formation in Klebsiella pneumoniae". Journal of Biological Chemistry. 289 (9): 6080–6090. doi:10.1074/jbc.M113.525535. PMC 3937674. PMID 24429283.
- 1 2 Heinz Gräfje, Wolfgang Körnig, Hans-Martin Weitz, Wolfgang Reiß, Guido Steffan, Herbert Diehl, Horst Bosche, Kurt Schneider and Heinz Kieczka "Butanediols, Butenediol, and Butynediol" in Ullmann's Encyclopedia of Industrial Chemistry, 2000, Wiley-VCH, Weinheim. doi:10.1002/14356007.a04_455
- ↑ C. De Mas; N. B. Jansen; G. T. Tsao (1988). "Production of optically active 2,3-butanediol by Bacillus polymyxa". Biotechnol. Bioeng. 31 (4): 366–377.
- ↑ "3,5-dinitrobenzoic acid". Combined Chemical Dictionary. Chapman and Hall/CRC Press. 2007.
- ↑ "Fermentation Derived 2,3-Butanediol", by Marcio Voloch et al. in Comprehensive Biotechnology, Pergamon Press Ltd., England Vol 2, Section 3, p. 933 (1986).
- ↑ Nikitina, Maria A.; Ivanova, Irina I. (2016-02-23). "Conversion of 2,3-Butanediol over Phosphate Catalysts". ChemCatChem. 8 (7): 1346–1353. doi:10.1002/cctc.201501399. ISSN 1867-3880.
- ↑ Kwok, Kelvin Mingyao; Choong, Catherine Kai Shin; Ong, Daniel Sze Wei; Ng, Joy Chun Qi; Gwie, Chuandayani Gunawan; Chen, Luwei; Borgna, Armando (2017-06-07). "Hydrogen-Free Gas-Phase Deoxydehydration of 2,3-Butanediol to Butene on Silica-Supported Vanadium Catalysts". ChemCatChem. 9 (13): 2443–2447. doi:10.1002/cctc.201700301. ISSN 1867-3880.