2-Methyl-2,3-butadiene
3-Methyl-1,2-butadiene
CAS: 598-25-4
Molecular Formula: C5H8
2-Methyl-2,3-butadiene - Names and Identifiers
| Name | 3-Methyl-1,2-butadiene |
| Synonyms | Dimethylallene 3,3-DIMETHYLALLENE 3,3-Dimethylallene 1,1-Dimethylallylene 3-Methyl-1,2-butadiene 3-METHYL-1,2-BUTADIENE 2-Methyl-2,3-butadiene 3-methylbuta-1,2-diene 1,2-butadiene,3-methyl- 3-methyl-buta-1,2-diene |
| CAS | 598-25-4 |
| EINECS | 209-926-1 |
| InChI | InChI=1/C5H8/c1-4-5(2)3/h1H2,2-3H3 |
2-Methyl-2,3-butadiene - Physico-chemical Properties
| Molecular Formula | C5H8 |
| Molar Mass | 68.12 |
| Density | 0.694 g/mL at 25 °C (lit.) |
| Melting Point | -148 °C (lit.) |
| Boling Point | 40-41 °C (lit.) |
| Flash Point | 10°F |
| Solubility | Soluble in ether, benzene, acetone, ethanol. |
| Vapor Presure | 6.87 psi ( 20 °C) |
| Appearance | clear liquid |
| Color | Colorless to Almost colorless |
| BRN | 1697090 |
| Storage Condition | 2-8°C |
| Sensitive | Air Sensitive |
| Refractive Index | n20/D 1.419(lit.) |
2-Methyl-2,3-butadiene - Risk and Safety
| Risk Codes | R11 - Highly Flammable R36/37/38 - Irritating to eyes, respiratory system and skin. R65 - Harmful: May cause lung damage if swallowed |
| Safety Description | S16 - Keep away from sources of ignition. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S62 - If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. |
| UN IDs | UN 3295 3/PG 2 |
| WGK Germany | 3 |
| FLUKA BRAND F CODES | 10-23 |
| Hazard Class | 3 |
| Packing Group | II |
2-Methyl-2,3-butadiene - Introduction
3-Methyl-1,2-butadiene is an organic compound with the chemical formula C5H8. The structure has three carbon-carbon double bonds, one of which has a methyl group. The following is information about the properties, uses, preparation and safety of 3-Methyl-1,2-butadiene.
Nature:
-Appearance: colorless liquid
-Melting point:-134 ℃
-Boiling point:-4 ℃
-Density: 0.667 g/mL
-Solubility: Soluble in organic solvents such as ethanol, ether and benzene
Use:
- 3-Methyl-1,2-butadiene is mainly used in organic synthesis reactions as an intermediate in the synthesis of rubber, plastics and chemicals.
-It can also be used as a polymer solvent and lubricating oil additive.
Preparation Method:
3-Methyl-1,2-butadiene is generally prepared by alkylation of olefins. The specific steps include reacting n-butene with a methylating agent (such as methanol) in the presence of a catalyst to form 3-Methyl-1,2-butadiene.
Safety Information:
- 3-Methyl-1,2-butadiene is a flammable liquid and needs to be handled with caution to avoid exposure to open flames and high temperatures.
-Contact or inhalation of 3-Methyl-1,2-butadiene may cause irritant reactions such as eye and skin irritation.
-When using or storing 3-Methyl-1,2-butadiene, take appropriate protective measures, such as wearing gloves, protective clothing and avoiding inhalation of its vapors. If necessary, use ventilation equipment to ensure air circulation.
Nature:
-Appearance: colorless liquid
-Melting point:-134 ℃
-Boiling point:-4 ℃
-Density: 0.667 g/mL
-Solubility: Soluble in organic solvents such as ethanol, ether and benzene
Use:
- 3-Methyl-1,2-butadiene is mainly used in organic synthesis reactions as an intermediate in the synthesis of rubber, plastics and chemicals.
-It can also be used as a polymer solvent and lubricating oil additive.
Preparation Method:
3-Methyl-1,2-butadiene is generally prepared by alkylation of olefins. The specific steps include reacting n-butene with a methylating agent (such as methanol) in the presence of a catalyst to form 3-Methyl-1,2-butadiene.
Safety Information:
- 3-Methyl-1,2-butadiene is a flammable liquid and needs to be handled with caution to avoid exposure to open flames and high temperatures.
-Contact or inhalation of 3-Methyl-1,2-butadiene may cause irritant reactions such as eye and skin irritation.
-When using or storing 3-Methyl-1,2-butadiene, take appropriate protective measures, such as wearing gloves, protective clothing and avoiding inhalation of its vapors. If necessary, use ventilation equipment to ensure air circulation.
Last Update：2024-04-10 22:29:15
