CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Gas or Vapor; Liquid |
|---|---|
| Color/Form | Volatile, clear, colorless liquid or vapor. |
| Boiling Point | 10.9 °C |
| Melting Point | -136.2 °C |
| Solubility | Insol in water; very sol in benzene; miscible in alcohol and ether |
| Density | 0.676 @ 0 °C/4 °C |
| Vapor Density | 1.9 (Air= 1) |
| Vapor Pressure | 1260 mm Hg @ 25 °C |
| Decomposition | 1,2-Butadiene decomposes to complex product mixtures when irradiated at short (147 nm) and intermediate (220-260 nm) wavelength light. Photodecomposition products for the 220-260 nm include: methylacetylene, 1-butyne, and allene. Similar products were found after photolysis 147 nm along with an unidentified polymer. |
| Heat of Vaporization | 23.426 kJ/mol @ 25 °C |
| Polymerization | 1,2-Butadiene ... polymerizes on heating. |
| Refractive Index | Index of refraction: 1.4205 @ 1 °C/D; |
| Kovats Retention Index | 450 448 441 427 |
| Other Experimental Properties | 2.21 mg/cu m = 1 ppm |
| Chemical Classes | Plastics & Rubber -> Other Monomers |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Gas Cylinder Compressed Gases GHS04 |
| GHS Hazard Statements |
H220:Flammable gases H280:Gases under pressure |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P377:Leaking gas fire: Do not extinguish, unless leak can be stopped safely. P381:Eliminate all ignition sources if safe to do so. P410+P403:Protect from sunlight. Store in a well-ventilated place. |
COMPUTED DESCRIPTORS
| Molecular Weight | 54.09 g/mol |
|---|---|
| XLogP3 | 1 |
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 0 |
| Rotatable Bond Count | 0 |
| Exact Mass | 54.0469501914 g/mol |
| Monoisotopic Mass | 54.0469501914 g/mol |
| Topological Polar Surface Area | 0 Ų |
| Heavy Atom Count | 4 |
| Formal Charge | 0 |
| Complexity | 38 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | No |
PRODUCT INTRODUCTION
description
Buta-1,2-diene is a butadiene and a member of allenes.