PRODUCT Properties
| Melting point: | 284-294 °C |
| Boiling point: | 240.29°C (rough estimate) |
| Density | 1.5720 (rough estimate) |
| refractive index | 1.6400 (estimate) |
| pka | 1.70±0.20(Predicted) |
| form | solid |
| Water Solubility | 5.1g/L(25 ºC) |
| EPA Substance Registry System | 4H-Pyran-2-carboxylic acid, 5-hydroxy-4-oxo- (499-78-5) |
Description and Uses
Building block for an intramolecular olefin-α-pyrone cycloaddition providing the colchicine ring skeleton.
Safety
| Symbol(GHS) |  GHS07 |
| Signal word | Warning |
| Hazard statements | H302 |
| Precautionary statements | P280-P305+P351+P338 |
| Hazard Codes | Xn |
| Risk Statements | 22 |
| WGK Germany | 3 |
