View source for 2,3-Dihydropyran

{{Chembox new
|ImageFile=Dhp.png
|ImageSize=100px
|IUPACName=3,4-Dihydro-2H-pyran
|OtherNames= Dihydropyran
|Section1= {{Chembox Identifiers
|  CASNo=110-87-2 
|  PubChem=24863242
|  SMILES=
  }}
|Section2= {{Chembox Properties
|  Formula=C<sub>5</sub>H<sub>8</sub>O
|  MolarMass=84.12
|  Appearance=colorless liquid
|  Density=0.992 g/mL at 25 °C
|  MeltingPtC=-70
|  BoilingPtC=86
|  Solubility=organic solvents
  }}
|Section3= {{Chembox Hazards
|  MainHazards=
|  FlashPt=
|  Autoignition=
  }}
}}
{{CMG}}
__NOTOC__


==Overview==

'''2,3-Dihydropyran''' is the [[organic compound]] with the [[chemical formula|formula]] C<sub>5</sub>H<sub>8</sub>O.  This cyclic [[ether]] is used to [[protecting group|protect]] alcohols in [[organic synthesis]].  Dihydropyran is prepared by the dehydration of tetrahydrofurfuryl alcohol over [[alumina]] at 300-400 °C.<ref>R. L. Sawyer and D. W. Andrus “2,3-Dihydropyran” Organic Syntheses, Coll. Vol. 3, p.276 (1955). http://www.orgsyn.org/orgsyn/pdfs/CV3P0276.pdf.</ref>
:[[Image:Pyranprep.png|270px]]

Dihydropyran reacts with alcohols to form [[Tetrahydropyran|tetrahydropyranyl]] ethers.  These ethers resist a variety of reactions, and the THP group can be removed with aqueous acid.

==References==
<references/>

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{{DEFAULTSORT:Dihydropyran, 2,3-}}
[[Category:Oxygen heterocycles]]
[[ja:ジヒドロピラン]]


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