PRODUCT Properties
| Melting point: | 42 °C(lit.) |
| Boiling point: | 121 °C15 mm Hg(lit.) |
| Density | 1.009 g/mL at 25 °C(lit.) |
| vapor pressure | 0.1Pa at 20℃ |
| refractive index | n |
| Flash point: | >230 °F |
| storage temp. | 2-8°C |
| solubility | Chloroform (Slightly), Methanol (Slightly) |
| pka | 12.80±0.20(Predicted) |
| form | Oil |
| color | Pale Yellow |
| BRN | 1720667 |
| LogP | -0.24 at 25℃ |
| CAS DataBase Reference | 3031-66-1(CAS DataBase Reference) |
| NIST Chemistry Reference | 3-Hexyne-2,5-diol(3031-66-1) |
| EPA Substance Registry System | 3-Hexyne-2,5-diol (3031-66-1) |
Description and Uses
3-Hexyne-2,5-diol is a more or less solid yellow mass of crystals depending on the relative content of the meso form. It is miscible with water and polar solvents. 3-Hexyne-2,5-diol is produced by BASF from acetylene and acetaldehyde by the Reppe ethynylation method.
3-Hexyne-2,5-diol is used in the synthesis of hyperbrancehed poly([1,2,3]-triazoles. Also used in the synthesis of pyrazoles and thiopyrazoles.
Safety
| Symbol(GHS) |  GHS07 |
| Signal word | Warning |
| Hazard statements | H302-H315-H319-H335 |
| Precautionary statements | P261-P305+P351+P338 |
| Hazard Codes | T |
| Risk Statements | 25-36 |
| Safety Statements | 26-36/37/39-45 |
| RIDADR | UN 2811 6.1/PG 3 |
| WGK Germany | 2 |
| RTECS | MR0175000 |
| HazardClass | 6.1(b) |
| PackingGroup | III |
| Toxicity | mouse,LDLo,intraperitoneal,500mg/kg (500mg/kg),"Summary Tables of Biological Tests," National Research Council Chemical-Biological Coordination Center. Vol. 4, Pg. 378, 1952. |
