Industrial Synthesis Route for DL-2-Bromoisovaleric Acid (CAS 565-74-2)
- High-Yield Production: Optimized Hell-Volhard-Zelinsky reaction achieving over 87% conversion efficiency.
- Strict Quality Control: Industrial purity standards verified by comprehensive COA and technical support.
- Scalable Supply: Reliable bulk procurement capabilities for pharmaceutical and agrochemical applications.
In the realm of advanced chemical synthesis, specific intermediates serve as foundational elements enabling the creation of complex molecules. DL-2-Bromoisovaleric acid, also identified as 2-Bromo-3-methylbutyric acid (CAS 565-74-2), is one such critical intermediate. Its unique structure and reactivity make it a valuable asset for chemists working in diverse fields, from pharmaceuticals to materials science. As a premier global manufacturer, NINGBO INNO PHARMCHEM CO.,LTD. is committed to providing high-quality materials to support these advancements through rigorous manufacturing process controls.
This compound possesses a molecular formula of C5H9BrO2 and a molecular weight of approximately 181.03 g/mol. The presence of a bromine atom adjacent to the carboxylic acid group classifies it as an alpha-bromo acid, imbuing it with significant reactivity. This makes it particularly useful in nucleophilic substitution reactions, where the bromine atom can be replaced by various nucleophiles to form new carbon-carbon or carbon-heteroatom bonds. This capability is central to its role as a pharmaceutical intermediate, allowing for the precise construction of drug molecules with specific biological activities.
Raw Material Sourcing and Preparation
The industrial production of this organic building block begins with the careful selection of raw materials. The primary precursor is isovaleric acid, which must be dried thoroughly to prevent hydrolysis side reactions during bromination. In large-scale operations, commercial isovaleric acid monohydrate is often subjected to azeotropic distillation with benzene or similar solvents to remove water content until the vapor temperature reaches 100°C. This step is crucial for maximizing the final industrial purity of the brominated product.
Bromine, the halogenating agent, is another critical component. For optimal reaction kinetics, the bromine is typically dried by shaking with concentrated sulfuric acid prior to use. Phosphorus trichloride serves as the catalyst for the Hell-Volhard-Zelinsky reaction. The stoichiometry must be carefully balanced; typically, a slight excess of bromine is employed to ensure complete conversion of the starting acid, while the catalyst loading is kept minimal to reduce downstream purification burdens.
Industrial Bromination Manufacturing Process Details
The core synthesis route involves heating the dried isovaleric acid with bromine and the phosphorus catalyst. The mixture is heated on an oil bath at 70–80°C for 10–20 hours. Process engineers monitor the reaction progress by observing the condenser; the process continues until the deep red color of bromine no longer shows. To drive the reaction to completion, an additional portion of bromine may be added, and the temperature is slowly raised to 100–105°C for a final 1.5–2 hours.
Safety is paramount during this exothermic phase. The reflux condenser is connected to a safety trap and a gas-absorption trap to manage hydrogen bromide emissions. Once the reaction is complete, the crude acid undergoes fractional distillation under reduced pressure. The low-boiling fraction, consisting mainly of unbrominated acid, is separated and can be recycled into the next batch. The target fraction, boiling at 110–125°C at 15 mm pressure, is collected as the final product. This rigorous distillation protocol ensures that the 2-Bromo-3-methylbutanoic acid meets stringent specification limits for impurities.
When sourcing high-purity 2-Bromo-3-methylbutyric acid, buyers should verify that the supplier utilizes similar vacuum distillation techniques to guarantee consistency. The yield for this optimized industrial process typically ranges between 87.5% and 88.6%, reflecting high efficiency and minimal waste.
Scalability and Production Capacity Analysis
Scaling this chemistry from laboratory to industrial reactors requires precise thermal management and corrosion-resistant equipment. NINGBO INNO PHARMCHEM CO.,LTD. utilizes specialized glass-lined reactors capable of withstanding the corrosive nature of bromine and hydrogen bromide gas. The production capacity is designed to meet the demands of bulk procurement for downstream synthesizers working on agrochemicals, flavors, fragrances, and specialty polymers.
Quality assurance is maintained through comprehensive testing at every stage. Each batch is accompanied by a Certificate of Analysis (COA) detailing assay, moisture content, and impurity profiles. Technical support is available to assist clients in integrating this intermediate into their specific custom synthesis workflows. The reliable supply of this compound is essential for consistent research and production outcomes.
Technical Specifications Overview
| Parameter | Specification | Test Method |
|---|---|---|
| Chemical Name | 2-Bromo-3-methylbutyric acid | GC-MS |
| CAS Number | 565-74-2 | N/A |
| Molecular Formula | C5H9BrO2 | Calculation |
| Molecular Weight | 181.03 g/mol | Calculation |
| Appearance | Colorless to Pale Yellow Liquid | Visual |
| Assay (GC) | > 98.0% | Gas Chromatography |
| Water Content | < 0.5% | Karl Fischer |
| Boiling Point | 110–125°C / 15 mmHg | Distillation |
Beyond pharmaceuticals, this intermediate finds applications in the synthesis of agrochemicals and specialty polymers. Its ability to act as a versatile building block allows chemists to tailor molecular properties for specific end-uses. As the chemical industry continues to innovate, intermediates like DL-2-Bromoisovaleric acid will remain indispensable tools for creating the advanced materials and life-saving therapies of tomorrow. Understanding its use in organic synthesis for pharmaceuticals is key to leveraging its full potential.
In conclusion, the industrial manufacture of this alpha-bromo acid requires a balance of precise chemical engineering and strict quality oversight. By adhering to proven synthesis routes and maintaining high standards of industrial purity, manufacturers ensure that downstream processes remain efficient and cost-effective. For partners seeking a reliable supply chain, understanding the technical depth behind the bulk price and availability is essential for long-term planning.