Benzopyran
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| Benzopyran | |
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| IUPAC name | 2H-Chromene |
| Other names | 2H-1-Benzopyran |
| Identifiers | |
| CAS number | [254-04-6] |
| Properties | |
| Molecular formula | C9H8O |
| Molar mass | 132.159 g/mol |
| Appearance | 405 K @ 0.1342 atm |
| Density | 1.0993 g/cm3 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Benzopyran is an polycyclic organic compound that results from the fusion of a benzene ring to a heterocyclic pyran ring. According to IUPAC nomenclature it is called chromene. There are two isomers of benzopyran depending on the orientation of the fusion of the two rings, resulting in 1-benzopyran (chromene) and 2-benzopyran (isochromene). Each of these structures has further isomers depending on the position of the carbon that is fully saturated. 1-benzopyran thus gives rise to 2H-1-benzopyran (2H-chromene) and 4H-1-benzopyran (4H-chromene). Analogously, 2-benzopyran gives rise to 1H-2-benzopyran (1H-isochromene) and 3H-2-benzopyran (3H-isochromene).
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