Ethylenediamine

Ethylenediamine (abbreviated as en when a ligand) is the organic compound with the formula C2H4(NH2)2. This colorless liquid with an ammonia-like odor is a strongly basic amine. It is a widely used building block in chemical synthesis, with approximately 500,000 tonnes produced in 1998.[6] Ethylenediamine readily reacts with moisture in humid air to produce a corrosive, toxic and irritating mist, to which even short exposures can cause serious damage to health (see safety). Ethylenediamine is the first member of the so-called polyethylene amines.

Ethylenediamine
Ball and stick model of ethylenediamine
Space-filling model of ethylenediamine
Names
Preferred IUPAC name
Ethane-1,2-diamine
Systematic IUPAC name
Ethane-1,2-diamine[1]
Other names
Edamine[2] 1,2-Diaminoethane, 'en' when a ligand
Identifiers
3D model (JSmol)
Abbreviations en
605263
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.003.154
EC Number
  • 203-468-6
1098
KEGG
MeSH ethylenediamine
RTECS number
  • KH8575000
UNII
UN number 1604
Properties
C2H8N2
Molar mass 60.100 g·mol−1
Appearance Colorless liquid[3]
Odor Ammoniacal[3]
Density 0.90 g/cm3[3]
Melting point 8 °C (46 °F; 281 K)[3]
Boiling point 116 °C (241 °F; 389 K)[3]
miscible
log P −2.057
Vapor pressure 1.3 kPa (at 20 °C)
5.8 mol Pa−1 kg−1
  • -46.26·10−6 cm3/mol
  • -76.2·10−6 cm3/mol (HCl salt)
1.4565
Thermochemistry
172.59 J K−1 mol−1
202.42 J K−1 mol−1
Std enthalpy of
formation (ΔfH⦵298)
 −63.55–−62.47 kJ mol−1
Std enthalpy of
combustion (ΔcH⦵298)
 −1.8678–−1.8668 MJ mol−1
Hazards
GHS pictograms
GHS Signal word Danger
GHS hazard statements
 H226, H302, H312, H314, H317, H334
P261, P280, P305+351+338, P310
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 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
3
0
Flash point 34 °C (93 °F; 307 K)[3]
385 °C (725 °F; 658 K)[3]
Explosive limits 2.7–16%
Lethal dose or concentration (LD, LC):
500 mg/kg (oral, rat)
470 mg/kg (oral, guinea pig)
1160 mg/kg (oral, rat)[4]
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 10 ppm (25 mg/m3)[5]
REL (Recommended)
 TWA 10 ppm (25 mg/m3)[5]
IDLH (Immediate danger)
 1000 ppm[5]
Related compounds
Related alkanamines
 1,2-Diaminopropane, 1,3-Diaminopropane
Related compounds
 Ethylamine, Ethylenedinitramine
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

Synthesis

Ethylenediamine is produced industrially by treating 1,2-dichloroethane with ammonia under pressure at 180 °C in an aqueous medium:[6][7]

In this reaction hydrogen chloride is generated, which forms a salt with the amine. The amine is liberated by addition of sodium hydroxide and can then be recovered by rectification. Diethylenetriamine (DETA) and triethylenetetramine (TETA) are formed as by-products.

Another industrial route to ethylenediamine involves the reaction of ethanolamine and ammonia:[8]

This process involves passing the gaseous reactants over a bed of nickel heterogeneous catalysts.

Ethylenediamine can be purified by treatment with sodium hydroxide to remove water followed by distillation.[9]

Applications

Ethylenediamine is used in large quantities for production of many industrial chemicals. It forms derivatives with carboxylic acids (including fatty acids), nitriles, alcohols (at elevated temperatures), alkylating agents, carbon disulfide, and aldehydes and ketones. Because of its bifunctional nature, having two amines, it readily forms heterocycles such as imidazolidines.

Precursor to chelation agents, drugs, and agrochemicals

A most prominent derivative of ethylenediamine is the chelating agent EDTA, which is derived from ethylenediamine via a Strecker synthesis involving cyanide and formaldehyde. Hydroxyethylethylenediamine is another commercially significant chelating agent.[6] Numerous bio-active compounds and drugs contain the N-CH2-CH2-N linkage, including some antihistamines.[10] Salts of ethylenebisdithiocarbamate are commercially significant fungicides under the brand names Maneb, Mancozeb, Zineb, and Metiram. Some imidazoline-containing fungicides are derived from ethylenediamine.[6]

Pharmaceutical ingredient

Ethylenediamine is an ingredient in the common bronchodilator drug aminophylline, where it serves to solubilize the active ingredient theophylline. Ethylenediamine has also been used in dermatologic preparations, but has been removed from some because of causing contact dermatitis.[11] When used as a pharmaceutical excipient, after oral administration its bioavailability is about 0.34, due to a substantial first-pass effect. Less than 20% is eliminated by renal excretion.[12]

Ethylenediamine-derived antihistamines are the oldest of the five classes of first-generation antihistamines, beginning with piperoxan aka benodain, discovered in 1933 at the Pasteur Institute in France, and also including mepyramine, tripelennamine, and antazoline. The other classes are derivatives of ethanolamine, alkylamine, piperazine, and others (primarily tricyclic and tetracyclic compounds related to phenothiazines, tricyclic antidepressants, as well as the cyproheptadine-phenindamine family)

Role in polymers

Ethylenediamine, because it contains two amine groups, is a widely used precursor to various polymers. Condensates derived from formaldehyde are plasticizers. It is widely used in the production of polyurethane fibers. The PAMAM class of dendrimers are derived from ethylenediamine.[6]

Tetraacetylethylenediamine

The bleaching activator tetraacetylethylenediamine is generated from ethylenediamine. The derivative N,N-ethylenebis(stearamide) (EBS) is a commercially significant mold-release agent and a surfactant in gasoline and motor oil.

Other applications

Coordination chemistry

Ethylenediamine is a well-known bidentate chelating ligand for coordination compounds, with the two nitrogen atoms donating their lone pairs of electrons when ethylenediamine acts as a ligand. It is often abbreviated "en" in inorganic chemistry. The complex [Co(ethylenediamine)3]3+ is an archetypical chiral tris-chelate complex. The salen ligands, some of which are used in catalysis, are derived from the condensation of salicylaldehydes and ethylenediamine.

Related derivatives of ethylenediamine include ethylenediaminetetraacetic acid (EDTA), tetramethylethylenediamine (TMEDA), and tetraethylethylenediamine (TEEDA). Chiral analogs of ethylenediamine include 1,2-diaminopropane and trans-diaminocyclohexane.

Safety

Ethylenediamine, like ammonia and other low-molecular weight amines, is a skin and respiratory irritant. Unless tightly contained, liquid ethylenediamine will release toxic and irritating vapors into its surroundings, especially on heating. The vapors react with moisture in humid air to form a characteristic white mist, which is extremely irritating to skin, eyes, lungs and mucus membranes.

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References
  1. "ethylenediamine - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 16 September 2004. Identification and Related Records. Retrieved 3 May 2012.
  2. "32007R0129". European Union. 12 February 2007. Annex II. Retrieved 3 May 2012.
  3. Record in the GESTIS Substance Database of the Institute for Occupational Safety and Health
  4. "Ethylenediamine". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  5. NIOSH Pocket Guide to Chemical Hazards. "#0269". National Institute for Occupational Safety and Health (NIOSH).
  6. Karsten Eller, Erhard Henkes, Roland Rossbacher, Hartmut Höke "Amines, Aliphatic" in Ullmann's Encyclopedia of Industrial Chemistry, 2005 Wiley-VCH Verlag, Weinheim. doi:10.1002/14356007.a02_001
  7. Hans-Jürgen Arpe, Industrielle Organische Chemie, 6. Auflage (2007), Seite 245, Wiley VCH
  8. Hans-Jürgen Arpe, Industrielle Organische Chemie, 6. Auflage (2007), Seite 275, Wiley VCH
  9. Rollinson, Carl L.; Bailar, Jr., John C. (1946). "Tris(ethylenediamine)chromium(III) Salts". Inorganic Syntheses. Inorganic Syntheses. 2. pp. 196–200. doi:10.1002/9780470132333.ch60. ISBN 9780470132333.
  10. Kotti, S. R. S. S.; Timmons, C. & Li, G. (2006). "Vicinal diamino functionalities as privileged structural elements in biologically active compounds and exploitation of their synthetic chemistry". Chemical Biology & Drug Design. 67 (2): 101–114. doi:10.1111/j.1747-0285.2006.00347.x. PMID 16492158.
  11. Hogan DJ (January 1990). "Allergic contact dermatitis to ethylenediamine. A continuing problem". Dermatol Clin. 8 (1): 133–6. doi:10.1016/S0733-8635(18)30536-9. PMID 2137392.
  12. Zuidema J. (1985-08-23). "Ethylenediamine, profile of a sensitizing excipient". Pharmacy World & Science. 7 (4): 134–40. doi:10.1007/BF02097249. PMID 3900925.

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