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2,3-Dihydropyran

2,3-Dihydropyran

IUPAC name	3,4-Dihydro-2H-pyran
Other names	Dihydropyran
Identifiers
CAS number	110-87-2
PubChem	24863242
Properties
Molecular formula	C₅H₈O
Molar mass	84.12
Appearance	colorless liquid
Density	0.992 g/mL at 25 °C
Melting point	-70 °C, 203 K, -94 °F
Boiling point	86 °C, 359 K, 187 °F
Solubility in water	organic solvents
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

2,3-Dihydropyran is the organic compound with the formula C₅H₈O. This cyclic ether is used to protect alcohols in organic synthesis. Dihydropyran is prepared by the dehydration of tetrahydrofurfuryl alcohol over alumina at 300-400 °C.^[1]

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