| boiling point | 64-65 °C19 mm Hg(lit.) |
| density | 0.98 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.481(lit.) |
| flash point | 108 °F |
| Storage conditions | 2-8°C |
| form | Liquid |
| colour | Clear yellow |
| proportion | 0.98 |
| Water solubility | almost insoluble |
| BRN | 1446054 |
| InChIKey | BZKFMUIJRXWWQK-UHFFFAOYSA-N |
| CAS | 930-30-3 |
| NIST Chemical information | 2-Cyclopenten-1-one(930-30-3) |
2-Cyclopenten-1-one is a versatile electrophile employed in various addition reactions including conjugate addition of organocopper nucleophiles, Michael reaction with silyl enol ethers and siloxanes. It is also used in Diels-Alder cycloadditions and phosphoniosilylations.


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