3,4-Dihydropyran Explained

3,4-Dihydropyran (DHP) is a heterocyclic compound with the formula C5H8O. The six-membered C5O ring has the unsaturation adjacent to oxygen. The isomeric 3,6-dihydropyran has a methylene separating the double bond and oxygen. DHP is used for protecting group for alcohols. It is a colorless liquid.[1]

Preparation

Dihydropyran is prepared by the dehydration of tetrahydrofurfuryl alcohol over alumina at 300–400 °C. THFA is itself prepared from tetrahydro-2-furoic acid.

Reactions

In organic synthesis, the 2-tetrahydropyranyl (THP) group is used as a protecting group for alcohols.

Notes and References

  1. EEROS. 3,4-Dihydro-2H-pyran. Paul Ch. Kierkus. 2001. 10.1002/047084289X.rd230. 0471936235 .

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