Sourcing 2-Fluoro-5-Iodobenzonitrile for Triazole Fungicide Side-Chain Synthesis
Technical Specifications and Purity Grades for 2-Fluoro-5-iodobenzonitrile in Triazole Synthesis
In the synthesis of triazole fungicides, the side-chain intermediate 2-fluoro-5-iodobenzonitrile (CAS 351003-36-6) plays a pivotal role. Its molecular formula C7H3FIN and molecular weight of approximately 247.008 g/mol make it a versatile building block for cross-coupling reactions. For industrial-scale production, the typical purity requirement is ≥98.0%, with a melting point range of 72–76°C. However, for sensitive catalytic systems, a purity of ≥99.0% is often specified to minimize side reactions. As a drop-in replacement for other commercial sources, our product matches these specifications precisely, ensuring seamless integration into existing synthesis routes. When evaluating a 2-fluoro-5-iodobenzonitrile manufacturer, it is critical to verify not only the assay but also the trace impurity profile, which can significantly impact the yield of the final fungicide.
| Parameter | Standard Grade | High Purity Grade |
|---|---|---|
| Assay (GC) | ≥98.0% | ≥99.0% |
| Melting Point | 72–76°C | 73–75°C |
| Appearance | Off-white powder | White to off-white powder |
| Moisture (K.F.) | ≤0.5% | ≤0.2% |
| Single Impurity | ≤1.0% | ≤0.5% |
The synthesis route typically involves halogen exchange or diazotization-iodination, and the industrial purity must be consistent to avoid batch failures. Our manufacturing process is optimized to deliver a product with low levels of the des-iodo impurity, which is crucial for maintaining the stoichiometry in palladium-catalyzed couplings. For R&D professionals, understanding these nuances is key when sourcing 2-fluoro-5-iodobenzonitrile for triazole fungicide side-chain synthesis.
Critical COA Parameters and Batch-to-Batch Consistency for Industrial-Scale Coupling Reactions
When scaling up triazole fungicide production, batch-to-batch consistency of 2-fluoro-5-iodobenzonitrile is non-negotiable. The Certificate of Analysis (COA) should detail not only the assay but also critical parameters like residual solvents, heavy metals, and specific impurities. For instance, in Suzuki coupling reactions, even trace levels of bromide or chloride can compete with the iodine, leading to undesired byproducts. Our COA includes limits for these halides, ensuring reliable performance. We also monitor the color of the powder; a shift from off-white to yellow can indicate degradation or contamination, which may affect the optical properties of downstream intermediates. As discussed in our article on trace iodide limits and automated dosing compatibility, maintaining tight control over iodide content is essential for automated solid dosing systems, where flowability and particle size distribution matter. For industrial-scale coupling reactions, the COA should also include a particle size analysis upon request, as this can influence dissolution rates in reaction solvents.
Bulk Packaging, Storage, and Handling: IBC Totes, 210L Drums, and Sub-Zero Viscosity Considerations
For bulk procurement, 2-fluoro-5-iodobenzonitrile is typically packaged in 25 kg fiber drums or, for larger quantities, 210L steel drums. While IBC totes are not standard for this solid product, they can be used for slurry formulations if required. Storage conditions are straightforward: keep in a cool, dry place away from light to prevent photodegradation. However, a non-standard parameter that field engineers must consider is the behavior of the molten product during winter shipping. If the material is shipped in liquid form (above its melting point), it can crystallize in transit, leading to solidification and potential handling issues. Our article on bulk 2-fluoro-5-iodobenzonitrile winter shipping and crystallization handling provides detailed guidance on pre-heating and unloading procedures to avoid pump cavitation and line blockages. For solid material, sub-zero temperatures are not a concern, but moisture absorption can be problematic; therefore, drums should be sealed with desiccant bags.
Non-Standard Field Parameters: Crystallization Behavior and Trace Impurity Impact on Fungicide Yield
Beyond the standard specifications, experienced process chemists know that the crystallization behavior of 2-fluoro-5-iodobenzonitrile can vary subtly between batches. The cooling rate during solidification affects crystal size and morphology, which in turn influences filtration and drying times in downstream steps. We have observed that a slower cooling ramp yields larger, more easily filterable crystals, reducing solvent retention. Another edge-case parameter is the presence of trace iodine (I2), which can form via decomposition and impart a purple hue. Even at ppm levels, free iodine can poison palladium catalysts in coupling reactions, drastically reducing turnover numbers. Our quality assurance includes a test for free iodine by colorimetry, ensuring that the product is suitable for sensitive catalytic systems. These insights come from hands-on experience in supplying the agrochemical industry, where the fluoroiodobenzonitrile intermediate must meet stringent performance criteria.
Frequently Asked Questions
What is the minimum order quantity (MOQ) for 2-fluoro-5-iodobenzonitrile?
Our standard MOQ is 1 kg for sample evaluation and 25 kg for commercial orders. Custom quantities can be discussed based on project needs.
Can you provide a custom synthesis route for derivatives?
Yes, we offer custom synthesis services for related fluoroiodobenzonitrile derivatives. Please inquire with your specific requirements.
What is the typical lead time for bulk orders?
For 25 kg to 100 kg orders, lead time is usually 2-3 weeks after order confirmation. Larger quantities may require 4-6 weeks.
Do you offer third-party analytical testing?
We can arrange testing at accredited labs upon request. Standard COA includes GC, HPLC, and melting point.
What are the payment terms for international buyers?
We accept T/T, L/C, and other negotiated terms. Contact our sales team for details.
Sourcing and Technical Support
Partnering with a reliable global manufacturer for 2-fluoro-5-iodobenzonitrile ensures a stable supply chain and consistent quality for your triazole fungicide projects. Our factory supply is backed by rigorous quality assurance and experienced technical support to assist with scale-up challenges. To request a batch-specific COA, SDS, or secure a bulk pricing quote, please contact our technical sales team.