1-Chloro-3-methyl-2-butene
1-Chloro-3-methyl-2-butene
CAS: 503-60-6
Molecular Formula: C5H9Cl
1-Chloro-3-methyl-2-butene - Names and Identifiers
1-Chloro-3-methyl-2-butene - Physico-chemical Properties
| Molecular Formula | C5H9Cl |
| Molar Mass | 104.58 |
| Density | 0.928 g/mL at 25 °C (lit.) |
| Boling Point | 58-59 °C/120 mmHg (lit.) |
| Flash Point | 56°F |
| Water Solubility | Miscible with chloroform, acetone, diethyl ether and alcohol. Immiscible with water. |
| Vapor Presure | 29.6mmHg at 25°C |
| Appearance | clear liquid |
| Color | Colorless to Light yellow |
| Storage Condition | 2-8°C |
| Refractive Index | n20/D 1.4488(lit.) |
| Physical and Chemical Properties | This product is a colorless liquid, B. p.58 ~ 59 ℃(16 kpa),n20D 1.4488, relative density 0.928,f. P. 56 F (13 C), insoluble in water, soluble in ethanol, dichloroethane and other organic solvents. |
| Use | Used as pesticide, pharmaceutical and Fragrance Intermediates |
1-Chloro-3-methyl-2-butene - Risk and Safety
| Risk Codes | R11 - Highly Flammable R36/37/38 - Irritating to eyes, respiratory system and skin. |
| 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. S27 - Take off immediately all contaminated clothing. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. |
| UN IDs | UN 1993 3/PG 2 |
| WGK Germany | 3 |
| RTECS | EM4298500 |
| TSCA | Yes |
| HS Code | 29032990 |
| Hazard Class | 3 |
| Packing Group | III |
1-Chloro-3-methyl-2-butene - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Uses | Chloroisopentene, or 1-chloro-3-methylbutene-2, is an intermediate for the preparation of chrysanthemum acid by the Martel method. It is also an intermediate for the preparation of dichlorochrysanthemum acid by the phase mode method. Used as intermediate of pesticide, medicine and perfume |
| Production method | The preparation method is to react isoprene with concentrated hydrochloric acid in the presence of catalyst CuCl, or pass hydrogen chloride into isoprene. A mixture of 1-chloro-3-methylbutene-2 and 3-chloro-3-methylbutene-1 can be obtained, the latter can be transposed at room temperature to obtain 1-chloro-3-methylbutene-2. The reaction equation is shown in the figure: CuCl is added as a catalyst in concentrated hydrochloric acid solution, and the catalyst is dissolved by intense stirring, then the temperature is controlled below 20 ℃, isoprene is added dropwise, after dropping, it is maintained at 20 ℃, then stirring is continued for 0.5h, the reaction is finished, the organic layer is quickly separated, neutralized and dried with anhydrous Na2CO3, and unreacted isoprene and low boiling substances generated by side reactions are evaporated at normal pressure, then the 79 ℃/40 kPa fraction is collected by vacuum distillation, which is the product (chloroprene B. p.105 ~ 115 ℃). Hydrogen chloride can also be introduced into isoprene, the reaction temperature is 0~10 ℃, the temperature of hydrogen chloride is -5 ℃, the content of isoprene in the reaction liquid is controlled by gas chromatography to determine the end point of the reaction, and the translocation is stirred at room temperature for about 4 hours. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
