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・ 1,2-Dichlorotetrafluoroethane
・ 1,2-Difluorobenzene
・ 1,2-Diformylhydrazine
・ 1,2-Dihydro-1,2-azaborine
・ 1,2-dihydrovomilenine reductase
・ 1,2-dihydroxy-6-methylcyclohexa-3,5-dienecarboxylate dehydrogenase
・ 1,2-dihydroxynaphthalene dioxygenase
・ 1,2-Diiodoethane
・ 1,2-Dimethoxybenzene
・ 1,2-Dimethylcyclopropane
・ 1,2-Dimethylhydrazine
・ 1,2-dioleoyl-sn-glycerophosphoethanolamine
・ 1,2-Dioxane
・ 1,2-Dioxetane
・ 1,2-Dioxetanedione
1,2-Dioxin
・ 1,2-Dithietane
・ 1,2-Dithiole
・ 1,2-Ethanedithiol
・ 1,2-Naphthoquinone
・ 1,2-Propanedithiol
・ 1,2-rearrangement
・ 1,2-Wittig rearrangement
・ 1,227 QI Facts to Blow Your Socks Off
・ 1,3,2,4-Dithiadiphosphetane 2,4-disulfides
・ 1,3,3,3-Tetrafluoropropene
・ 1,3,5-Triazido-2,4,6-trinitrobenzene
・ 1,3,5-Triazine
・ 1,3,5-Trichlorobenzene
・ 1,3,5-Trinitrobenzene


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1,2-Dioxin : ウィキペディア英語版
1,2-Dioxin

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1,2-Dioxin is a heterocyclic, organic, antiaromatic compound with the chemical formula C4H4O2. It is an isomeric form of 1,4-dioxin (or ''p''-dioxin).
Due to its peroxide-like characteristics, 1,2-dioxin is very unstable and has not been isolated. Even substituted derivatives are very labile, e.g. 1,4-diphenyl-2,3-benzodioxin.〔J. P. Smith, A. K. Schrock, G. B. Schuster: ''Chemiluminescence of organic peroxides. Thermal generation of an o-xylylene peroxide'', J. Am. Chem. Soc., 1981, 104, 1041–1047; .〕 Indeed, in 1990, 3,6-bis(''p''-tolyl)-1,2-dioxin was wrongly accounted as the first stable derivative.〔H. J. Shine, D. C. Zhao: ''Electron transfer to excited doublet states. Photoirradiation of 10-methylphenothiazine cation radical perchlorate in solutions of phenylacetylene and p-tolylacetylene in acetonitrile'', J. Org. Chem., 1990, 55, 4086–4089; .〕 It was subsequently shown that the initial compound was not a derivative of 1,2-dioxin, but a thermodynamically more stable dione.〔E. Block, Z. Shan, R. S. Glass, J. Fabian: ''Revised structure of a purported 1,2-dioxin: a combined experimental and theoretical study'', J. Org. Chem., 2003, 68, 4108–4111; PMID 12737603; .〕

File:Dioxin isomers.svg|The isomers 1,2-dioxin (left) and 1,4-dioxin (right)
File:1,4-diphenyl-2,3-benzodioxin.svg|Structure of the transient 1,4-diphenyl- 2,3-benzodioxin
File:Revised structure 1,2-Dioxin.svg|Dioxin (1) and dione form (2)

== References ==



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