1,2-Dioxin

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1,2-Dioxin
Skeletal formula of 1,2-dioxin 1,2-dioxin.svg
Skeletal formula of 1,2-dioxin
1,2-Dioxin-3D-balls 2.png
1,2-Dioxin-3D-spacefill.png
Names
Preferred IUPAC name
1,2-Dioxine
Systematic IUPAC name
1,2-Dioxacyclohexa-3,5-diene
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
UNII
  • InChI=1S/C4H4O2/c1-2-4-6-5-3-1/h1-4H Yes check.svgY
    Key: VCZQYTJRWNRPHF-UHFFFAOYSA-N Yes check.svgY
  • InChI=1/C4H4O2/c1-2-4-6-5-3-1/h1-4H
    Key: VCZQYTJRWNRPHF-UHFFFAOYAH
  • O1OC=CC=C1
Properties
C4H4O2
Molar mass 84.074 g·mol−1
Related compounds
Related compounds
 Dibenzodioxin

1,4-Dioxin

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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1,2-Dioxin is a heterocyclic, organic, antiaromatic [1] compound with the chemical formula C4H4O2. It is an isomeric form of 1,4-dioxin (or p-dioxin).

1,2-Dioxin (left) and 1,4-dioxin (right) Dioxin isomers.svg
1,2-Dioxin (left) and 1,4-dioxin (right)

Due to its peroxide-like characteristics, 1,2-dioxin is very unstable and has not been isolated. Calculations suggest that it would isomerize rapidly into but-2-enedial. [2] Even substituted derivatives, such as 1,4-diphenyl-2,3-benzodioxin, are very labile. [3]

Structure of the transient 1,4-diphenyl-2,3-benzodioxin 1,4-diphenyl-2,3-benzodioxin.svg
Structure of the transient 1,4-diphenyl-2,3-benzodioxin

In 1990, 3,6-bis(p-tolyl)-1,2-dioxin (1) was incorrectly reported as the first stable derivative. [4] It was subsequently shown that the initial compound was not a derivative of 1,2-dioxin, but a thermodynamically more stable dione (2). [5]

Dioxin (1) and dione form (2) Revised structure 1,2-Dioxin.svg
Dioxin (1) and dione form (2)

References

  1. ↑ Pelloni, Stefano; Faglioni, Francesco; Lazzeretti, Paolo (2013-09-01). "Parity violation energies of C4H4X2 molecules for X = O, S, Se, Te and Po" . Molecular Physics. 111 (16–17): 2387–2391. doi:10.1080/00268976.2013.794396. ISSN   0026-8976. S2CID   100861633.
  2. ↑ Matsumoto, M. (2014). "Product Class 1: 1,2-Dioxins and Benzo- and Dibenzo- Fused Derivatives". Science of Synthesis: Houben-Weyl Methods of Molecular Transformations Vol. 16: Six-Membered Hetarenes with Two Identical Heteroatoms. Georg Thieme Verlag. p. 13. ISBN   9783131718815 . Retrieved 2020-06-12.
  3. ↑ Smith, Jimmie P.; Schrock, Alan K.; Schuster, Gary B. (1982). "Chemiluminescence of organic peroxides. Thermal generation of an o-xylylene peroxide". Journal of the American Chemical Society. 104 (4): 1041. doi:10.1021/ja00368a021..
  4. ↑ Shine, Henry J.; Zhao, Da Chuan (1990). "Electron transfer to excited doublet states. Photoirradiation of 10-methylphenothiazine cation radical perchlorate in solutions of phenylacetylene and p-tolylacetylene in acetonitrile". The Journal of Organic Chemistry. 55 (13): 4086. doi:10.1021/jo00300a026..
  5. ↑ Block, Eric; Shan, Zhixing; Glass, Richard S.; Fabian, Jürgen (2003). "Revised Structure of a Purported 1,2-Dioxin: A Combined Experimental and Theoretical Study". The Journal of Organic Chemistry. 68 (10): 4108–11. doi:10.1021/jo034305i. PMID   12737603.
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