tert-Amyl alcohol

tert-Amyl alcohol (TAA) or 2-methylbutan-2-ol (2M2B), is a branched pentanol.

tert-Amyl alcohol
Ball-and-stick model of 2-methyl-2-butanol
Space-filling model of the 2-methyl-2-butanol
Names
Preferred IUPAC name
2-Methylbutan-2-ol
Other names
2-Methyl-2-butanol
tert-Amyl alcohol
t-Amylol
TAA
tert-Pentyl alcohol
2-Methyl-2-butyl alcohol
t-Pentylol
Amylene hydrate
Dimethylethylcarbinol
Identifiers
3D model (JSmol)
1361351
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.000.827
EC Number
  • 200-908-9
KEGG
MeSH tert-amyl+alcohol
RTECS number
  • SC0175000
UNII
UN number 1105
Properties
C5H12O
Molar mass 88.150 g·mol−1
Appearance Colorless liquid
Odor Camphorous
Density 0.805 g/cm−3[1]
Melting point −9 °C; 16 °F; 264 K
Boiling point 101 to 103 °C; 214 to 217 °F; 374 to 376 K
120 g·dm−3
Solubility soluble in water, benzene, chloroform, diethylether and ethanol[2]
log P 1.0950.5:1 volume ratio
Vapor pressure 1.6 kPa (at 20 °C)
−7.09×10−5 cm3/mol
1.405
Viscosity 4.4740 mPa·s (at 298.15 K)[1]
Thermochemistry
229.3 J K−1 mol−1
−380.0 to −379.0 kJ mol−1
−3.3036 to −3.3026 MJ mol−1
Hazards
Safety data sheet hazard.com
GHS pictograms
GHS Signal word Danger
H225, H315, H332, H335
P210, P261
NFPA 704 (fire diamond)
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasolineHealth code 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
1
0
Flash point 19 °C (66 °F; 292 K)
437 °C (819 °F; 710 K)
Explosive limits 9%
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Historically TAA has been used an anesthetic[3] and more recently used as a recreational drug.[4] TAA is mostly a positive allosteric modulator for GABAA receptors in the same way as ethanol.[5] The effects of TAA and ethanol are similar.

TAA is a colorless liquid with a burning flavor[6] and an unpleasant odor[7] similar to paraldehyde with a hint of camphor.[8] TAA remains as a liquid at room temperature making it a useful alternative solvent to tert-butyl alcohol.

Production

TAA is primarily made by the hydration of 2-methyl-2-butene in the presence of an acidic catalyst.[9][3]

Natural occurrence

Fusel alcohols like TAA are grain fermentation byproducts and therefore trace amounts of TAA are present in many alcoholic beverages.[10] Traces of TAA have been detected in other foods, like fried bacon,[11] cassava[12] and rooibos tea.[13]

History

From about 1880s to 1950s, TAA was used as an anesthetic with the contemporary name of amylene hydrate, but was rarely used solely because of the existence of more efficient drugs.[3] In the 1930s, TAA was mainly used as a solvent for the primary anesthetic tribromoethanol (TBE). Like chloroform, TBE is toxic for the liver, so the use of such solutions declined in the 1940s in humans. TBE-TAA-solutions remained in use as short-acting anesthetics for laboratory mice and rats. Such solutions are sometimes called Avertin, which was a brand name for the now discontinued TAA and TBE solution with a volume ratio of 0.5:1 made by the Winthrop Laboratories.[14] Nowadays TAA has found use as a recreational drug.[4]

Use and effects

Ingestion or inhalation of TAA causes euphoria, sedative, hypnotic, and anticonvulsant effects similar to ethanol.[15] When ingested, the effects of TAA may begin in about 30 minutes and can last up to 1–2 days.[16] 2–4 grams of TAA causes unconsciousness. About 100 g of ethanol induces a similar level of unconsciousness.[7]

Overdose and toxicity

The smallest known dose of TAA that has killed a person is 30 ml.[16]

An overdose produces symptoms similar to alcohol poisoning and is a medical emergency due to the sedative/depressant properties which manifest in overdose as potentially lethal respiratory depression. Sudden loss of consciousness, simultaneous respiratory and metabolic acidosis,[16] fast heartbeat, increased blood pressure, pupil constriction, coma, respiratory depression[17] and death may follow from an overdose.The oral LD50 in rats is 1 g/kg. The subcutaneous LD50 in mice is 2.1 g/kg.[18]

Metabolism

In rats, TAA is primarily metabolized via glucuronidation, as well as by oxidation to 2-methyl-2,3-butanediol. It is likely that the same path is followed in humans,[19] though older sources suggest TAA is excreted unchanged.[3]

TAA oxidises to 2-methyl-2,3-butanediol.

The use of TAA cannot be detected with general ethanol tests or other ordinary drug tests. Its use can be detected from a blood or a urine sample by using gas chromatography–mass spectrometry for up to 48 hours after consumption.[17]

See also

References
  1. Lomte, S.B.; Bawa, M.J.; Lande, M.K.; Arbad, B.R. (2009). "Densities and Viscosities of Binary Liquid Mixtures of 2-Butanone with Branched Alcohols at (293.15 to 313.15) K". Journal of Chemical & Engineering Data. 54: 127–130. doi:10.1021/je800571y.
  2. Haynes, William M.; Lide, David R.; Bruno, Thomas J. (2014). "Section 3 - Physical Constants of Organic Compounds". CRC Handbook of Chemistry and Physics, 95th Edition (95th ed.). CRC Press. p. 362. ISBN 9781482208689. OCLC 908078665.
  3. Adriani, John (1962). The Chemistry and Physics of Anesthesia (2nd ed.). Illinois: Thomas Books. pp. 273–274. ISBN 9780398000110.
  4. Rusiecka, Izabela; Gągało, Iwona; Anand, Jacek Sein; Schetz, Daria; Waldman, Wojciech (October 2016). "Drinking "Vodka" or vodka – This is a question". Toxicology in Vitro. 36: 66–70. doi:10.1016/j.tiv.2016.07.009. ISSN 1879-3177. PMID 27448500.
  5. Martin, J (2004). "Influence of oxygenated fuel additives and their metabolites on γ-aminobutyric acidA (GABAA) receptor function in rat brain synaptoneurosomes". Toxicology Letters. 147 (3): 209–217. doi:10.1016/j.toxlet.2003.10.024. PMID 15104112.
  6. O'Neil, Maryadele J., ed. (2006). The Merck index (14th ed.). Merck. p. 1232. ISBN 9780911910001. OCLC 70882070.
  7. Brandenberger, Hans; Maes, Robert A. A. (1997). Analytical Toxicology for Clinical, Forensic, and Pharmaceutical Chemists. Berlin: W. de Gruyter. pp. 400–401. ISBN 978-3110107319. OCLC 815506841.
  8. Yandell, D. W.; et al. (1888). "Amylene hydrate, a new hypnotic". The American Practitioner and News. 5: 88–98.
  9. Papa, Anthony J. (2004). "Amyl Alcohols". Kirk–Othmer Encyclopedia of Chemical Technology (5th ed.). Hoboken, N.J.: Wiley-Interscience. doi:10.1002/0471238961.0113251216011601.a01.pub2. ISBN 9780471238966.
  10. Gould, George M.; Scott, Richard J. E. (1919). The Practitioner's Medical Dictionary. P. Blakiston's. p. 50. Retrieved 2018-07-27.
  11. Ho, C.-T.; Lee, K.-N.; Jin, Q.-Z. (1983). "Isolation and identification of volatile flavor compounds in fried bacon". Journal of Agricultural and Food Chemistry. 31 (2): 336. doi:10.1021/jf00116a038. ISSN 0021-8561.
  12. Dougan, J.; Robinson, J. M.; Sumar, S.; Howard, G. E.; Coursey, D. G. (1983). "Some flavouring constituents of cassava and of processed cassava products". Journal of the Science of Food and Agriculture. 34 (8): 874. doi:10.1002/jsfa.2740340816. ISSN 1097-0010.
  13. Habu, Tsutomu; Flath, Robert A.; Mon, T. Richard; Morton, Julia F. (1 March 1985). "Volatile components of Rooibos tea (Aspalathus linearis)". Journal of Agricultural and Food Chemistry. 33 (2): 249–254. doi:10.1021/jf00062a024. ISSN 0021-8561.
  14. Meyer, Robert E.; Fish, Richard E. (November 2005). "A review of tribromoethanol anesthesia for production of genetically engineered mice and rats". Lab Animal. 34 (10): 47–52. doi:10.1038/laban1105-47. ISSN 0093-7355. PMID 16261153. S2CID 21759580.
  15. Lewis, Robert Alan (1998). Lewisʼ Dictionary of Toxicology. Boca Raton, Florida: CRC Press. pp. 45. ISBN 978-1566702232. OCLC 35269968.
  16. "2-METHYL-2-BUTANOL - National Library of Medicine HSDB Database". www.toxnet.nlm.nih.gov. Archived from the original on 2018-03-08. Retrieved 2018-04-08.
  17. Anand, Jacek Sein; Gieroń, Joanna; Lechowicz, Wojciech; Schetz, Daria; Kała, Maria; Waldman, Wojciech (September 2014). "Acute intoxication due to tert-amyl alcohol—a case report". Forensic Science International. 242: e31–e33. doi:10.1016/j.forsciint.2014.07.020. ISSN 1872-6283. PMID 25112153.
  18. Soehring, K.; Frey, H.H.; Endres, G. (1955). "Relations between constitution and effect of tertiary alcohols". Arzneimittel-Forschung. 5 (4): 161–165. PMID 14389140.
  19. Collins, A. S.; Sumner, S. C.; Borghoff, S. J.; Medinsky, M. A. (1999). "A physiological model for tert-amyl methyl ether and tert-amyl alcohol: Hypothesis testing of model structures". Toxicological Sciences. 49 (1): 15–28. doi:10.1093/toxsci/49.1.15. PMID 10367338.
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