Chemistry:Allyl cyanide

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Allyl cyanide
Structural formula of allyl cyanide
Ball-and-stick model of the allyl cyanide molecule
Names
Preferred IUPAC name
But-3-enenitrile
Identifiers
3D model (JSmol)
605352
ChEBI
ChemSpider
EC Number
  • 203-701-1
UNII
Properties
C4H5N
Molar mass 67.091 g·mol−1
Appearance colourless liquid
Density 0.834 g/cm3[1]
Melting point −87 °C (−125 °F; 186 K)
Boiling point 116 to 121 °C (241 to 250 °F; 389 to 394 K)[1]
Hazards
Main hazards Flammable, poison, irritates skin and eyes
Safety data sheet MSDS
GHS pictograms GHS02: Flammable GHS06: Toxic
GHS Signal word Danger
H226, H301, H315, H312, H319, H311
P280, P261, P305+351+338, P301+310, P311
Ingestion hazard Toxic if swallowed.
Inhalation hazard May be fatal if inhaled. Causes respiratory tract irritation.
Eye hazard Causes eye irritation.
Skin hazard Causes skin irritation.
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 4: Very short exposure could cause death or major residual injury. E.g. VX gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
3
4
0
Flash point 24 °C (75 °F; 297 K)[1]
455 °C (851 °F; 728 K)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Tracking categories (test):

Allyl cyanide is an organic compound with the formula CH2CHCH2CN. Like other small alkyl nitriles, allyl cyanide is colorless and soluble in organic solvents. Allyl cyanide occurs naturally as an antifeedant and is used as a cross-linking agent in some polymers.[2]

Synthesis

Allyl cyanide is obtained by the reaction of allyl acetate with hydrogen cyanide.[2]

A laboratory route to allyl cyanide involves treating allyl bromide with copper(I) cyanide.[3]

CH2=CHCH2Br + CuCN → CH2=CHCH2CN + CuBr

Other allyl halides may be used for this reaction including allyl iodide as done by A. Rinne and B. Tollens in 1871 where iodide is a better leaving group than its bromide equivalent and therefore increases the yield.[4]

Natural occurrences

Allyl cyanide was discovered in 1863 by H. Will and W. Koerner in 1863, they found the compound to be present in mustard oil.[5] The first synthesis of allyl cyanide was reported by A. Claus in 1864.[6]

Allyl cyanide is produced in cruciferous vegetables by myrosinase, an enzyme which hydrolyses glucosinolates to form nitriles and other products.[7] Myrosinase is activated by l-ascorbic acid (vitamin C) under the influence of the pH,[8] and higher myrosinase activity has been shown in damaged cabbage leaves, while its activity is reduced by cooking the leaves, although the glucosinolates can then be transformed to allyl cyanide by microflora in the intestines.[9] As cruciferous vegetables like cabbage, broccoli, cauliflower and sprouts are part of the human diet, allyl cyanide is normally consumed orally. The normal dose of allyl cyanide contained in a meal is shown to be much lower than the doses used in animal studies.[7] The daily level at which behavioural effects were demonstrated is 500 μg/kg bodyweight, whereas the daily human consumption amounts to 0.12 μg/kg. Although the dose-response relationship is still to be examined, it is therefore thought that allyl cyanide has no potency as a neurotoxicant when consumed in vegetables.

Applications

Allyl cyanide may be used as an additive in propylene carbonate-based electrolytes for graphite anodes preventing exfoliation of the anode by film-forming. The underlying mechanism is thought to be a reductive polymerization mechanism.[10]

Neurotoxicity

Studies performed on rats showed that allyl cyanide cause loss of hair cells in the auditory system and troubling of the cornea.[11] The same study also showed that the rearing activity of rats was reduced by oral ingestion of allyl cyanide. It has these neurotoxic symptoms in common with other aliphatic mononitriles such as 2-butenenitrile and 3,3'-iminopropionitrile. Allyl cyanide was also shown to cause a swelling of the axons.[12] Studies done with mice showed that a single (albeit rather high) dose of allyl cyanide can cause permanent behavioural changes.[13] These changes include twitching of the head, an increased locomotor activity and circling. These mice were furthermore shown to suffer from neuronal contractions, possibly leading to cell death. Sheep are far more tolerant to the toxic effects of allyl cyanide than rats. Studies suggest that this detoxification is due to the predigestion in the rumen.[14]

Toxicokinetics

Allyl cyanide is known to be metabolized in the liver by the Cytochrome P-450 enzyme system (mainly CYP2E1) to cyanide.[15] The absorption and distribution of allyl cyanide in rats is extraordinary fast. The highest concentrations of allyl cyanide were measured in the stomach tissue and stomach contents due to the fact that the stomach is the principal site of absorption after oral administration. The next highest concentration levels were found to be in the bone marrow with a peak in concentration between 0 and 3 hours after administration. The liver, kidneys, spleen and lungs also accumulated allyl cyanide over the course of 48 hours. The highest concentration in the kidney was observed between 3 and 6 hr after dosing. This observation indicates rapid elimination of allyl cyanide. The major route of detoxification is the conversion from cyanide to thiocyanate.[16] Major routes of excretion are through the urine and expired air.

The serotonin and dopamine systems are thought to be involved in the behavioral abnormalities caused by allyl cyanide. Treatment by serotonin and dopamine antagonists caused a reduction in the behavioral abnormalities.[17] Ataxia, trembling, convulsions, diarrhea, salivation, lacrimation and irregular breathing are known effects that are caused by oral ingestion of allyl cyanide.

References

  1. ↑ 1.0 1.1 1.2 1.3 MSDS
  2. ↑ 2.0 2.1 Ludger Krähling; Jürgen Krey; Gerald Jakobson; Johann Grolig; Leopold Miksche (2002). "Allyl Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a01_425. ISBN 9783527303854. 
  3. ↑ J. V. Supniewski; P. L. Salzberg (1928). "Allyl Cyanide". Org. Synth. 8: 4. doi:10.15227/orgsyn.008.0004. 
  4. ↑ A. Rinne, B. Tollens: "Ueber das Allylcyanür oder Crotonitril", in: Justus Liebigs Annalen der Chemie, 1871, 159 (1), S. 105–109; doi:10.1002/jlac.18711590110
  5. ↑ C. Pomeranz: "Ueber Allylcyanid und Allylsenföl", in: Justus Liebigs Annalen der Chemie, 1906, 351 (1–3), P. 354–362: doi:10.1002/jlac.19073510127
  6. ↑ A. Claus: "Ueber Crotonsäure", in: Justus Liebigs Annalen der Chemie, 1864, 131 (1), P. 58–66;doi:10.1002/jlac.18641310106
  7. ↑ 7.0 7.1 H. Tanii et al. Allylnitrile: generation from cruciferous vegetables and behavioral effects on mice of repeated exposure / Food and Chemical Toxicology, 42, (2004), 453-458
  8. ↑ L.G. West et al. Allyl Isothiocyanate and Allyl Cyanide Production in Cell-Free Cabbage Leaf Extracts, Shredded Cabbage, and Cole Slaw / J. Agric. Food Chem. Vol. 25, No. 6, (1997), 1234-1238
  9. ↑ C. Krul et al. Metabolism of sinigrin (2-propenyl glucosinolate) by the human colonic microflora in a dynamic in vitro large-intestinal model / Carcinogenesis, Vol. 24, No. 6, (2002), 1009-1016
  10. ↑ L. Zhang et al. Allyl cyanide as a new functional additive in propylene carbonate-based electrolyte for lithium-ion batteries Iconics August 2013, Volume 19, Issue 8, pp 1099-1103
  11. ↑ E. Balbuena, J. Llorens Behavioural disturbances and sensory pathology following allylnitrile exposure in rats / Brain Research 904 (2001) 298-306
  12. ↑ C. Soler-Martín et al. Butenenitriles have low axonopathic potential in the rat / Toxicology Letters 200 (2011) 187-193
  13. ↑ Xiao-ping Zang et al. Behavioral abnormalities and apoptotic changes in neurons in mice brain following a single administration of allylnitrile / Arch Toxicol 73 (1999) 22-32
  14. ↑ Duncan, A. J. and Milne, J. A. (1992), Rumen microbial degradation of allyl cyanide as a possible explanation for the tolerance of sheep to brassica-derived glucosinolates. J. Sci. Food Agric., 58: 15–19.
  15. ↑ A. E. Ahmed and M. Y. H. Farooqui: Comparative toxicities of aliphatic nitriles. Toxicol. Len. 12, 157-163 (1982)
  16. ↑ E. Ahmed, M. Y. H. Farooqui, and N. M. Tneff: Nitriles. In:"Biotransformation of Foreign Compounds" (M. W. Anders, ed), pp. 485-510. Academic Press, New York, 1985.
  17. ↑ H. Tanii, Y. Kurosaka, M. Hayashi, and K. Hashimoto: Allylnitrile: a compound which induces long-term dyskinesia in mice following a single administration. Exp. Neurol. 103, 64-67 (1989)



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