CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | 2-butene appears as a colorless liquefied petroleum gas. Asphyxiate gas. Flammability limits in air 1.8-9.7% by volume. |
|---|---|
| Color/Form | Colorless gas |
| Odor | Slightly aromatic odor |
| Boiling Point | 3.73 °C at 760 mm Hg /cis-2-Butene/ |
| Melting Point | -139.3 °C /cis-2-Butene/ |
| Flash Point | -19.99 °C (-3.98 °F) - closed cup |
| Solubility | Very soluble in ethanol and ether. Soluble in benzene. /cis- and trans-2-Butene/ |
| Density | 0.6042 g/cu cm at 20/4 °C |
| Vapor Density | 1.93 (Air = 1) |
| Vapor Pressure | 1600 mm Hg at 25 °C /cis-2-Butene/ |
| LogP | log Kow = 1.85 (mixture of 70% cis- and 30% trans-2-Butene) |
| Henry's Law Constant | Henry's Law constant= 0.224 atm-cu m/mole at 25 °C |
| Stability/Shelf Life | Stable under recommended storage conditions. |
| Autoignition Temperature | 324 °C (615 °F) |
| Decomposition | When heated to decomposition it emits acrid smoke and irritating vapors. |
| Viscosity | 0.00763 mPa |
| Heat of Combustion | -2708 kJ/mol |
| Heat of Vaporization | 21.37 kJ/mol |
| Surface Tension | 0.0132 dyn/cm at 25 °C |
| Odor Threshold | 2700 mg/cu m |
| Refractive Index | Index of refraction: 1.3848 at 25 °C/D |
| Kovats Retention Index | 406.42 408.4 408 412.3 414 410.2 410 410 405 412 412 410 411 406 405 412 406.1 409 406 408 408 406 383 411 417 |
| Other Experimental Properties | Hydroxyl radical reaction rate constant = 6.00X10-11 cu cm/mole-sec at 25 °C (isomer average) |
| Chemical Classes | UVCB |
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 |
P410+P403:Protect from sunlight. Store in a well-ventilated place. |
COMPUTED DESCRIPTORS
| Molecular Weight | 56.11 g/mol |
|---|---|
| XLogP3 | 2.3 |
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 0 |
| Rotatable Bond Count | 0 |
| Exact Mass | 56.062600255 g/mol |
| Monoisotopic Mass | 56.062600255 g/mol |
| Topological Polar Surface Area | 0 Ų |
| Heavy Atom Count | 4 |
| Formal Charge | 0 |
| Complexity | 15.2 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 1 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
2-butene appears as a colorless liquefied petroleum gas. Asphyxiate gas. Flammability limits in air 1.8-9.7% by volume.