https://wiki.guldforum.se/w/index.php?action=history&feed=atom&title=Pyridazin
Pyridazin - Versionshistorik
2026-10-26T13:42:23Z
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https://wiki.guldforum.se/w/index.php?title=Pyridazin&diff=12475&oldid=prev
Dan Olsson den 2 mars 2013 kl. 14.33
2013-03-02T14:33:30Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Versionen från 2 mars 2013 kl. 10.33</td>
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Dan Olsson
https://wiki.guldforum.se/w/index.php?title=Pyridazin&diff=8504&oldid=prev
Dan Olsson: 1 version
2013-02-24T16:08:19Z
<p>1 version</p>
<p><b>Ny sida</b></p><div>{{Kemibox<br />
|Vardagligt namn = <br />
|Bild = Pyridazin.svg<br />
|Bildtext = Strukturformel<br />
|Bildbredd = <br />
|Bild2 = Pyridazine3d.png<br />
|Bild2text = Molekylmodell<br />
|Systematiskt namn = 1,2-Diazabensen<br />
|Övriga namn = Pyridazin, ortodiazin<br />
|Kemisk formel = [[Kol|C]]<sub>4</sub>[[Väte|H]]<sub>4</sub>[[Kväve|N]]<sub>2</sub><br />
|Utseende = Färglös till gulbrun vätska<br />
|CAS-nummer = 289-80-5<br />
|SMILES = C1=CN=NC=C1<br />
|Molmassa = 80,088<br />
|Densitet = 1,10<br />
|Löslighet = blandbar<br />
|LöslighetTemp = <br />
|Smältpunkt = -8<br />
|Smältextra = <br />
|Kokpunkt = 208<br />
|Kokextra = <br />
|Huvudfara = {{Farosymbol|Xi}}<br />
|NFPA704 = <br />
|LD50 = 2650 mg/kg<br />
|}}<br />
<br />
'''Pyridazin''' eller '''1,2-diazabensen''' är en [[heterocyklisk]] och [[aromatisk]] ring.<br />
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==Egenskaper==<br />
Pyridazin är en svag [[bas (kemi)|bas]]; {{pKa}} för korresponderande syra är 2,34. Ringen innehåller 6 п-elektroner med en [[termokemi]]sk stabiliseringsenergi på 32,7 kcal/mol (jämfört med 45,8 kcal/mol för bensen).<br />
<br />
==Framställning==<br />
Pyridazinringar syntetiseras vanligen genom att [[mättnad (organisk kemi)|omättade]] [[karbonylgrupp|1,4-dikarbonyler]] får reagera med [[hydrazin]] under avspjälkning av två vattenmolekyler.<br />
<br />
==Användning==<br />
I sig själv har pyridazin inte många användningsområden, men flera derivat används inom syntes och läkemedelskemi.<br />
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==Besläktade föreningar==<br />
*[[Pyrazin]] (1,4-diazabensen, isomer)<br />
*[[Pyrimidin]] (1,3-diazabensen, isomer)<br />
*[[Pyridin]] (azabensen)<br />
*[[Bensen]] (utan några kväven)<br />
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[[Kategori:Pyridaziner]]<br />
[[Kategori:Aromatiska baser]]<br />
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[[de:Pyridazin]]<br />
[[en:Pyridazine]]<br />
[[es:Piridazina]]<br />
[[fa:پیریدازین]]<br />
[[fr:Pyridazine]]<br />
[[it:Piridazina]]<br />
[[nl:Pyridazine]]<br />
[[ja:ピリダジン]]<br />
[[pt:Piridazina]]</div>
Dan Olsson