Alpha Bromo Propionic Acid
DL-2-Bromopropionic acid
CAS: 598-72-1
Molecular Formula: C3H5BrO2
Alpha Bromo Propionic Acid - Names and Identifiers
Alpha Bromo Propionic Acid - Physico-chemical Properties
| Molecular Formula | C3H5BrO2 |
| Molar Mass | 152.97 |
| Density | 1.7 g/mL at 25 °C (lit.) |
| Melting Point | 25.7°C |
| Boling Point | 203 °C (lit.) |
| Flash Point | 212°F |
| Water Solubility | soluble |
| Vapor Presure | 0.12mmHg at 25°C |
| Appearance | Liquid After Melting |
| Specific Gravity | 1.7 |
| Color | Clear colorless to yellow |
| BRN | 605451 |
| pKa | pK1: 2.971 (25°C) |
| Storage Condition | room temp |
| Refractive Index | n20/D 1.475(lit.) |
| Physical and Chemical Properties | Density 1.65 melting point 25.7°C boiling point 203°C refractive index 1.474-1.476 flash point 100°C water soluble |
| Use | For organic synthesis, pharmaceutical intermediates |
Alpha Bromo Propionic Acid - Risk and Safety
| Risk Codes | R22 - Harmful if swallowed R34 - Causes burns R40 - Limited evidence of a carcinogenic effect R36/37/38 - Irritating to eyes, respiratory system and skin. R38 - Irritating to the skin R11 - Highly Flammable |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36 - Wear suitable protective clothing. S16 - Keep away from sources of ignition. S24 - Avoid contact with skin. S9 - Keep container in a well-ventilated place. |
| UN IDs | UN 3265 8/PG 2 |
| WGK Germany | 3 |
| RTECS | UA2451715 |
| TSCA | Yes |
| HS Code | 29159080 |
| Hazard Class | 8 |
| Packing Group | II |
Alpha Bromo Propionic Acid - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Application | 2-bromopropionic acid is an organic intermediate, which can be obtained after bromination of propionic acid. Alkane bromides are important organic chemicals, which are mainly used as intermediates in the synthesis of various organic materials, drugs and daily necessities. |
| preparation | replace the air in the glass reaction tube (containing stirrer) of the 25mL Schleck tube with oxygen, and add KBr(29.8mg,0.25mmol), CHCl3(0.18mL), propanoic acid)(63.0mg,0.85mmol), 40% NaNO2 aqueous solution (4.3mg,0.025mmol) and 37% HCl aqueous solution (42 μL,0.5mmol), quickly cover the matching lid and seal. The reaction was carried out at 40°C and 23W CFL irradiation at a distance of about 10cm. Stir for 18 hours until the color of bromine in the reaction tube basically fades for the end of the reaction. Open the bottle cap, add 2mL CDCl3 and internal standard CH2Br2 to the reaction mixture, add 0.5g of anhydrous sodium sulfate to dry, and sample for 1H NMR analysis. The yield of bromopropionic acid based on KBr is 92%, of which 3-bromopropionic acid (3-bromopropionic acid) is 68% and 2-bromopropionic acid (2-bromopropionic acid) is 24%. |
| Uses | 2-bromopropionic acid is the herbicide quizaloxazole, oxazolaproxyl, thiazolaproxyl, pyrifluhexaproxyl, flupiroxalproxyl, milk fluoxaproxyl, metolachlor, dioxalamide and fungicides metalaxyl, benzoxyl, promethyl, etc. intermediates. used in organic synthesis used as organic synthesis, pharmaceutical intermediates organic synthesis intermediates, used in the production of herbicides, naphthalene, synthetic pharmaceutical intermediates alanine. |
| Production method | It is obtained by bromination of propionic acid. Slowly add bromine to dry propionic acid containing trichlorophosphorus, keep the temperature at 80 ℃, raise the temperature to 85 ℃ after the bromine is added, raise the temperature to 100 ℃ after the bromine color disappears completely, about 2-3h, then recover bromine and hydrobromic acid under reduced pressure until it is out, and then distill under reduced pressure to obtain the finished product. the preparation method is to add propionic acid and phosphorus trichloride in the reaction kettle, keep the temperature at 80 ℃, slowly add bromine dropwise to the reaction solution, raise the temperature to 85 ℃ after the bromine is added, raise the temperature to 100 ℃ after the bromine color disappears completely, take about 2~3 hours, then recover bromine and hydrobromic acid under reduced pressure, and then distill the finished product under reduced pressure. |
| category | toxic substances |
| toxicity classification | highly toxic |
| acute toxicity | oral-mouse LD50: 250 mg/kg |
| flammability hazard characteristics | open flame, high heat and combustible; combustion produces toxic bromide smoke |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; Store separately from oxidant, alkali and food raw materials |
| fire extinguishing agent | foam, mist water, sand, dry powder, carbon dioxide |
Last Update：2024-04-09 19:05:09
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