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4-Pyrone (γ-pyrone or pyran-4-one) is an unsaturated cyclic chemical compound with the molecular formula C 5 H 4 O 2.It is isomeric with 2-pyrone. Preparation [ edit ]
In chemistry, pyran, or oxine, is a six-membered heterocyclic, non-aromatic ring, consisting of five carbon atoms and one oxygen atom and containing two double bonds. The molecular formula is C 5 H 6 O. There are two isomers of pyran that differ by the location of the double bonds.
This image is a derivative work of the following images: Image:4H-Pyran.png licensed with GFDL . 2008-03-08T09:39:08Z Cvf-ps 293x325 (3873 Bytes) bigger size; 2006-01-20T16:56:37Z Chemiker 80x95 (3269 Bytes) Structure of 4H-pyran Struktur von 4H-Pyran [[Category:Chemical structures]] {{GFDL-self}}
Tetrahydropyran (THP) is the organic compound consisting of a saturated six-membered ring containing five carbon atoms and one oxygen atom. It is named by reference to pyran, which contains two double bonds, and may be produced from it by adding four hydrogens.
They contain an unsaturated six-membered lactone ring, which has one oxygen atom and an adjacent ketone functional group. [1] There are two isomers denoted as 2-pyrone and 4-pyrone . The 2-pyrone (or α-pyrone) structure is found in nature as part of the coumarin ring system. 4-Pyrone (or γ-pyrone) is found in some natural chemical compounds ...
It is a derivative of 4-pyrone that functions in nature as a chelation agent produced by several species of fungi, especially Aspergillus oryzae, which has the Japanese common name koji. [ 2 ] [ 3 ] [ 4 ] Kojic acid is a by-product in the fermentation process of malting rice, for use in the manufacturing of sake, the Japanese rice wine. [ 2 ]
2-Pyrone (α-pyrone or pyran-2-one) is an unsaturated cyclic chemical compound with the molecular formula C 5 H 4 O 2.It is isomeric with 4-pyrone.. 2-Pyrone is used in organic synthesis as a building block for more complex chemical structures because it may participate in a variety of cycloaddition reactions to form bicyclic lactones.
Thiopyran is a heterocyclic compound with the chemical formula C 5 H 6 S. [1] It has two isomers, 2H-thiopyran and 4H-thiopyran, which differ by the location of double bonds. Thiopyrans are analogous to pyrans in which the oxygen atoms have been replaced by sulfur atoms.