Ethylamine

Ethylamine[1]
Names
Preferred IUPAC name
Ethanamine
Other names
Ethylamine
Identifiers
75-04-7 YesY
3D model (Jmol) Interactive image
3DMet B00176
505933
ChEBI CHEBI:15862 YesY
ChEMBL ChEMBL14449 YesY
ChemSpider 6101 YesY
ECHA InfoCard 100.000.759
EC Number 200-834-7
897
KEGG C00797 YesY
MeSH ethylamine
PubChem 6341
RTECS number KH2100000
UNII YG6MGA6AT5 YesY
UN number 1036
Properties
C2H7N
Molar mass 45.09 g·mol−1
Appearance Colourless gas
Odor fishy, ammoniacal
Melting point −85 to −79 °C; −121 to −110 °F; 188 to 194 K
Boiling point 16 to 20 °C; 61 to 68 °F; 289 to 293 K
Miscible
log P 0.037
Vapor pressure 116.5 kPa (at 20 °C)
350 μmol Pa−1 kg−1
Acidity (pKa) 10.7
Thermochemistry
−57.7 kJ mol−1
Hazards
GHS pictograms
GHS signal word DANGER
H220, H319, H335
P210, P261, P305+351+338, P410+403
F+ Xi
R-phrases R12, R36/37
S-phrases (S2), S16, S26
NFPA 704
Flammability code 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g., propane Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
4
3
0
Flash point −37 °C (−35 °F; 236 K)
383 °C (721 °F; 656 K)
Explosive limits 3.5–14%
Lethal dose or concentration (LD, LC):
  • 265 mg kg−1 (dermal, rabbit)
  • 400 mg kg−1 (oral, rat)
1230 ppm (mammal)[2]
3000 ppm (rat, 4 hr)
4000 ppm (rat, 4 hr)[2]
US health exposure limits (NIOSH):
PEL (Permissible)
 TWA 10 ppm (18 mg/m3)[3]
REL (Recommended)
 TWA 10 ppm (18 mg/m3)[3]
IDLH (Immediate danger)
 600 ppm[3]
Related compounds
Related alkanamines
Related compounds
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

Ethylamine is an organic compound with the formula CH3CH2NH2. This colourless gas has a strong ammonia-like odor. It is miscible with virtually all solvents and is a nucleophilic base, as is typical for amines. Ethylamine is widely used in chemical industry and organic synthesis.

pKa (of protonated form) = 10.7[4]

Synthesis

Ethylamine is produced on a large scale by two processes. Most commonly ethanol and ammonia are combined in the presence of an oxide catalyst:

CH3CH2OH + NH3 → CH3CH2NH2 + H2O

In this reaction, ethylamine is coproduced together with diethylamine and triethylamine. In aggregate, approximately 80M kilograms/year of these three amines are produced industrially.[5] It is also produced by reductive amination of acetaldehyde.

CH3CHO + NH3 + H2 → CH3CH2NH2 + H2O

Ethylamine can be prepared by several other routes, but these are not economical. Ethylene and ammonia combine to give ethylamine in the presence of a sodium amide or related basic catalysts.[6]

H2C=CH2 + NH3 → CH3CH2NH2

Hydrogenation of acetonitrile, acetamide, and nitroethane affords ethylamine. These reactions can be effected stoichiometrically using lithium aluminium hydride. In another route, ethylamine can be synthesized via nucleophilic substitution of a haloethane (such as chloroethane or bromoethane) with ammonia, utilizing a strong base such as potassium hydroxide. This method affords significant amounts of byproducts, including diethylamine and triethylamine.[7]

CH3CH2Cl + NH3 + KOH → CH3CH2NH2 + KCl + H2O

Ethylamine is also produced naturally in the cosmos; it is a component of interstellar gases.[8]

Reactions and applications

Ethylamine undergoes the reactions anticipated for a primary alkyl amine, such as acylation and protonation. Reaction with sulfuryl chloride followed by oxidaton of the sulfonamide give diethyldiazene, EtN=NEt.[9] Ethylamine may be oxidized using a strong oxidizer such as potassium permanganate to form acetaldehyde.

Ethylamine like some other small primary amines is a good solvent for lithium metal, giving the ion [Li(amine)4]+ and the solvated electron. Evaporation of these solutions, gives back lithium metal. Such solutions are used for the reduction of unsaturated organic compounds, such as naphthalenes[10] and alkynes.

Ethylamine is a precursor to many herbicides including atrazine and simazine. It is found in rubber products as well.

Ethylamine is used as a precursor chemical along with benzilnitrate (as opposed to o-chlorobenzonitrile and methylamine in ketamine synthesis) in the clandestine synthesis of cyclidine dissociative anesthetic agents (the analogue of ketamine which is missing the 2-chloro group on the phenyl ring, and its N-ethyl analog) which are closely related to the well known anesthetic agent ketamine and the recreational drug phencyclidine and have been detected on the black market, being marketed for use as a recreational hallucinogen and tranquilizer. This produces a cyclidine with the same mechanism of action as ketamine (NMDA receptor antagonism) but with a much greater potency at the PCP binding site, a longer half-life, and significantly more prominent sympathomimetic effects.[11]

References

  1. ↑ Merck Index, 12th Edition, 3808.
  2. 1 2 "Ethylamine". Immediately Dangerous to Life and Health. National Institute for Occupational Safety and Health (NIOSH).
  3. 1 2 3 "NIOSH Pocket Guide to Chemical Hazards #0263". National Institute for Occupational Safety and Health (NIOSH).
  4. ↑ Wilson and Gisvold's Textbook of Organic Medicinal and Pharmaceutical Chemistry, 9th Ed. (1991), (J. N. Delgado and W. A. Remers, Eds.) p.878, Philadelphia: Lippincott.
  5. ↑ Karsten Eller, Erhard Henkes, Roland Rossbacher, Hartmut Höke, "Amines, Aliphatic" Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.doi:10.1002/14356007.a02_001
  6. ↑ Ulrich Steinbrenner, Frank Funke, Ralf Böhling, Method and device for producing ethylamine and butylamine, United States Patent 7161039.
  7. ↑ Nucleophilic substitution, Chloroethane & Ammonia, St Peter's School
  8. ↑ NRAO, "Discoveries Suggest Icy Cosmic Start for Amino Acids and DNA Ingredients", Feb 28 2013
  9. ↑ Ohme, R.; Preuschhof, H.; Heyne, H.-U. Azoethane, Organic Syntheses, Collected Volume 6, p.78 (1988)
  10. ↑ Kaiser, E. M.; Benkeser R. A. Δ9,10-Octalin, Organic Syntheses, Collected Volume 6, p.852 (1988)
  11. ↑ "World Health Organization Critical Review Report of Ketamine, 34th ECDD 2006/4.3" (PDF).
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