| 词条 | 1,2-Difluoroethylene |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 477203654 | ImageFileL1 = Cis-1,2-difluoroethylene.svg | ImageNameL1 = Skeletal formula of cis-1,2-difluoroethene with all explicit hydrogens added | ImageCaptionL1= cis-1,2-Difluoroethene (Z) | ImageFileR1 = Trans-1,2-difluoroethylene.svg | ImageNameR1 = Skeletal formula of trans-1,2-difluoroethene with all explicit hydrogens added | ImageCaptionR1= trans-1,2-Difluoroethene (E) | ImageFileL2 = Cis-1,2-difluoroethene.png | ImageNameL2 = 3D structure of Cis-1,2-difluoroethene | ImageCaptionL2= cis-1,2-Difluoroethene (Z) | ImageFileR2 = Trans-1,2-difluoroethene.png | ImageNameR2 = 3D structure of Trans-1,2-difluoroethene | ImageCaptionR2= trans-1,2-Difluoroethene (E) | ImageFileL3 = Cis-1,2-difluoroetheneball.jpg | ImageNameL3 = spacefill structure of Cis-1,2-difluoroethene | ImageFileR3 = Trans-1,2-difluoroetheneball.jpg | ImageNameR3 = spacefill structure of Tran-1,2-difluoroethene | ImageCaptionL3= cis-1,2-Difluoroethene (Z) | ImageCaptionR3= trans-1,2-Difluoroethene (E) | IUPACName = 1,2-Difluoroethene | OtherNames = 1,2-Difluoroethylene sym-Difluoroethylene Ethene, 1,2-difluoro-,(Z)- cis-Difluoroethene | Section1 = {{Chembox Identifiers | CASNo_Ref = {{cascite|correct|CAS}} | CASNo = 1630-77-9 | CASNo_Comment = (Z) | PubChem = 5462921 | ChemSpiderID = 21106435 | SMILES = C(=C/F)/F | SMILES_Comment = (cis) | SMILES1 = C(=C/F)\\F | SMILES1_Comment = (trans) | StdInChI = 1S/C2H2F2/c3-1-2-4/h1-2H/b2-1- | StdInChIKey = WFLOTYSKFUPZQB-UPHRSURJSA-N }} | Section2 = {{Chembox Properties | C=2 | H=2 | F=2 | Appearance = | Density = | MeltingPt = | BoilingPt = -36.0±8.0 °C | Solubility = | MagSus = -60.0·10{{sup|−6}} cm{{sup|3}}/mol }} }} 1,2-Difluoroethylene, also known as 1,2-difluoroethene, is an organofluoride with the molecular formula C{{sub|2}}H{{sub|2}}F{{sub|2}}. It can exist as either of two geometric isomers, cis-1,2-difluoroethylene or trans-1,2-difluoroethylene. It is regarded as a hazardous chemical for being toxic by inhalation (see MSDS), and a volatile chemical, and it causes irritation when it comes into contact with the skin and mucous membranes. E-Z relative stabilityFor most 1,2-disubstituted compounds that exhibit cis–trans isomerism, the trans (E) isomer is more stable than the cis (Z) isomer. However, 1,2-difluoroethylene has the opposite situation, with the cis more stable than the trans by 0.9 kcal/mol.[1] See also
References1. ^{{cite journal|last1=Craig|first1=Norman C.|last2=Entemann|first2=Eric A.|title=Thermodynamics of cis-trans Isomerizations. The 1,2-Difluoroethylenes|journal=Journal of the American Chemical Society|date=July 1961|volume=83|issue=14|pages=3047–3050|doi=10.1021/ja01475a019}} {{DEFAULTSORT:Difluoroethylene, 1, 2-}} 2 : Organofluorides|Alkene derivatives |
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