| Product Name | but-3-yn-2-one |
| CAS No. | 1423-60-5 |
| Synonyms | 3-Butyn-2-one; But-3-yn-2-one |
| InChI | InChI=1/C4H4O/c1-3-4(2)5/h1H,2H3 |
| Molecular Formula | C4H4O |
| Molecular Weight | 68.074 |
| Density | 0.902g/cm3 |
| Boiling point | 85°C at 760 mmHg |
| Refractive index | 1.403 |
| Hazard Symbols |  F:Flammable;  T+:Very toxic; |
| Risk Codes | R11:; R28:; R36/37/38:; |
| Safety | S16:; S26:; S28A:; S36/37/39:; S45:; |
1423-60-5 but-3-yn-2-one
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