View source for Pyrimidine

{{Chembox
| Verifiedimages = changed
| Watchedfields = changed
| verifiedrevid = 464377262
| ImageFileL1 = Pyrimidine 2D aromatic full.svg
| ImageFileR1 = Pyrimidine 2D numbers.svg
| ImageFileL2 = Pyrimidine-3D-balls-2.png
| ImageAltL2 = Pyrimidine molecule
| ImageFileR2 = Pyrimidine-3D-spacefill.png
| ImageAltR2 = Pyrimidine molecule
| IUPACName = Pyrimidine
| OtherNames = 1,3-Diazine, m-Diazine}}

'''Pyrimidines''' include three of the [[Base (chemistry)|bases]] in [[DNA]] and [[RNA]].

A pyrimidine is an [[aromatic hydrocarbon|aromatic]] [[cyclic compound|heterocyclic]] [[organic compound]], similar to [[purine]].<ref name="isbn0-582-27843-0">{{cite book |author= Gilchrist T.L. |title=Heterocyclic chemistry  |publisher=Longman |location=New York |year=1997 |isbn=0-582-27843-0 }}</ref> It has nitrogens at positions 1 and 3 in the ring.<ref name="JouleMills5thp250">{{cite book | title=Heterocyclic chemistry |edition=5th |editor1-last=Joule |editor1-first=John A. |editor2-last=Mills |editor2-first=Keith |publisher=Wiley |location=Oxford |year=2010 |page=250 |quote= |isbn=978-1-405-13300-5 |oclc= |doi= |url= |accessdate=}}</ref><ref>Brown H.C. ''et al'' 1955. In Baude, E.A. and Nachod, F.C., ''Determination of organic structures by physical methods''. Academic Press, New York.</ref> 

== Pyrimidines ==
The pyrimidine ring system occurs widely in nature.<ref name=Lagoja1>{{Cite journal| author = Lagoja, Irene M.| year = 2007| title = Pyrimidine as constituent of natural biologically active compounds| journal = Chemistry and Biodiversity| volume = 2| issue = 1| pages = 1–50| id = | url = http://homepage.univie.ac.at/mario.barbatti/papers/pyrazine_pyrimidine/pyrimidine.pdf| doi = 10.1002/cbdv.200490173| pmid = 17191918| s2cid = 9942715| access-date = 2014-10-05| archive-date = 2017-02-15| archive-url = https://web.archive.org/web/20170215012342/http://homepage.univie.ac.at/mario.barbatti/papers/pyrazine_pyrimidine/pyrimidine.pdf| url-status = dead}}</ref>
*[[Cytosine]] (C), 
*[[Thymine]] (T), 
*[[Uracil]] (U).
*[[Thiamine]] ([[vitamin B1]])
 
It is also found in many synthetic compounds such as [[barbiturate]]s and the [[HIV]] drug, [[zidovudine]]. [[Uric acid]] is a pyrimidine derivative.  

== References ==
{{reflist}}
{{Simple aromatic rings}}


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[[Category:Organonitrogen compounds]]