Methyl 2-Fluoroisobutyrate
Methyl 2-Fluoroisobutyrate
CAS: 338-76-1
Molecular Formula: C5H9FO2
Methyl 2-Fluoroisobutyrate - Names and Identifiers
Methyl 2-Fluoroisobutyrate - Physico-chemical Properties
| Molecular Formula | C5H9FO2 |
| Molar Mass | 120.12 |
| Density | 1 |
| Boling Point | 108-109 |
| Flash Point | 22.16°C |
| Vapor Presure | 21.853mmHg at 25°C |
| Appearance | clear liquid |
| Color | Colorless to Almost colorless |
| Storage Condition | under inert gas (nitrogen or Argon) at 2-8°C |
| Refractive Index | 1.3740 to 1.3780 |
Methyl 2-Fluoroisobutyrate - Risk and Safety
| Hazard Symbols | F - Flammable |
| Risk Codes | 10 - Flammable |
| Safety Description | 16 - Keep away from sources of ignition. |
| UN IDs | 3272 |
| Hazard Class | 3/8 |
| Packing Group | II |
Methyl 2-Fluoroisobutyrate - Reference Information
| Application | 2-fluoroisobutyrate as a pesticide intermediate can synthesize fluorotriazine group herbicides, which are made of phenoxyalkylamines Substituted by triazine groups. These herbicides not only have significant advantages in herbicidal activity, but also have no toxic effect on rice. |
| preparation | 1) esterification reaction: methyl 2-hydroxyisobutyrate (20.1g,0.17mol) is added into the reactor, stirred, cooled to -10 ~-5 ℃, then the temperature is controlled at -10 ~-5 ℃, sulfoxide chloride (36.4g,0.31mol) is added dropwise, the dropwise addition is completed, and the stirring reaction is carried out for 3 hours, GC detects that the reaction of raw material 2-hydroxyisobutyrate methyl ester is complete and stops the reaction; 2) Fluorination reaction: the reaction kettle is cooled to -15 ~-20 ℃, then hydrogen fluoride (37.4g,1.87mol) and triethylamine (0.7g,6.80mmol) are added to the reaction kettle, the liquid obtained in step 1) is added to the reaction kettle, cooling is stopped, temperature is slowly increased, stirring at 40~45 ℃ for 3~5h,GC detection is carried out, the reaction of raw materials is complete and the reaction is over; 3) post-treatment and rectification: the organic phase in the reaction solution is extracted with ethyl acetate (300mL × 3), the organic phase of ethyl acetate is washed with water (50mL), the saturated sodium bicarbonate aqueous solution (50mL × 2) is washed with water (50mL), the dryer is dried to remove water, and then chlorine gas is introduced into the organic phase, GC detects the content of methyl methacrylate <0.2wt.%, stop the chlorine gas, and then transfer to a rectification tower, decompression fractionation, at 150~160mmHg, charge a fraction of 65~70 ℃, namely methyl 2-fluoroisobutyrate, GC detection content 99.5%, yield: 79.3%. |
Last Update：2024-04-09 20:52:54
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