3Hdihydropyran

3H-dihydropyran is a heterocyclic organic compound that belongs to the dihydropyran family. It consists of a six-membered ring containing one oxygen atom and one carbon–carbon double bond. The designation “3H” indicates that the hydrogen is located at the third position of the ring, reflecting the standard nomenclature used for saturated derivatives of pyran.

In terms of composition, the compound has the empirical formula C5H8O. It is related to pyran, which is more unsaturated, and it exists as one of several possible dihydropyran isomers, including 2H- and 4H-dihydropyran. The different isomers differ in the placement of hydrogen atoms and the location of the remaining double bond within the ring.

Applications and occurrence of 3H-dihydropyran are primarily in academic and laboratory settings. It is not a widely used consumer chemical or bulk industrial reagent. Rather, it appears in the literature as an intermediate in organic synthesis or as a subject of fundamental studies on ring reactivity and heterocyclic chemistry. Detailed methods for its preparation and transformation are described in specialized organic chemistry references, and specific synthetic routes often depend on the target context and desired functionalization.

See also: dihydropyran, pyran, heterocyclic chemistry.