page_title: 3,4-Dihydropyran
section_title: Reactions
hierarchical_section_title: 3,4-Dihydropyran / Reactions
caption_attribution_description: English: protection of ROH as THP
context_page_description: 3,4-Dihydropyran 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.
context_section_description: In organic synthesis, the 2-tetrahydropyranyl (THP) group is used as a protecting group for alcohols.  Reaction of the alcohol with DHP forms a THP ether, protecting the alcohol from a variety of reactions.  The alcohol can later be restored by acidic hydrolysis, concomitant with formation of 5-hydroxypentanal.
caption: Protection of an alcohol as THP ether followed by its deprotection.  Both steps require acid catalysts.
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