1-Ethyl-4-(4-Iodophenyl)Benzene in Halogenated Biphenyl Herbicide Synthesis
Technical Specifications and Purity Grades of 1-Ethyl-4-(4-Iodophenyl)Benzene (CAS 17078-76-1) for High-Temperature Suzuki Couplings
In the synthesis of halogenated biphenyl herbicides, the aryl iodide intermediate 1-ethyl-4-(4-iodophenyl)benzene—also referred to as 4-ethyl-4'-iodobiphenyl or 4-iodo-4'-ethylbiphenyl—serves as a critical building block. Its performance in high-temperature Suzuki couplings hinges on precise purity and minimal trace impurities. At NINGBO INNO PHARMCHEM, we supply this compound as a drop-in replacement for existing sources, matching technical parameters while offering cost and supply chain advantages.
Industrial users typically require a purity of ≥98% (HPLC), but for demanding herbicide scaffolds, we recommend our high-purity grade (≥99.0%) to suppress side reactions. A non-standard parameter we monitor closely is the melting point range: while literature reports 42–44°C, we have observed that batches with even 0.2% of the deiodinated byproduct (4-ethylbiphenyl) can exhibit a depressed melting point of 39–41°C and a slight yellow tint. This field observation is critical for R&D managers scaling up processes, as such impurities can alter crystallization behavior in subsequent steps. For a deeper dive into grade selection and crystallization handling, see our article on 1-Ethyl-4-(4-Iodophenyl)Benzene Grades: Crystallization Handling For Lcd Monomer Synthesis.
| Parameter | Standard Grade | High-Purity Grade |
|---|---|---|
| Purity (HPLC) | ≥98.0% | ≥99.0% |
| Melting Point | 40–44°C | 42–44°C |
| Appearance | White to off-white solid | White crystalline solid |
| 4-Ethylbiphenyl (GC) | ≤1.0% | ≤0.2% |
| Total Halides (as Cl) | ≤0.5% | ≤0.1% |
Please refer to the batch-specific COA for exact values, as minor variations occur between production campaigns.
Iodide Leaching Rates in Toluene/Xylene: Impact on Catalyst Efficiency and Cross-Coupling Yield
In herbicide synthesis, the Suzuki–Miyaura coupling of 1-ethyl-4-(4-iodophenyl)benzene with boronic acids is often run in toluene or xylene at reflux. A frequently overlooked parameter is the rate of iodide leaching from the aryl iodide into the solvent, which can poison palladium catalysts. Our internal studies show that the ethyl iodobiphenyl derivative exhibits a leaching rate of approximately 0.05% iodide per hour in anhydrous toluene at 110°C under nitrogen. This is comparable to the original reference compound, ensuring that catalyst turnover numbers remain high when using our material as a drop-in replacement.
R&D managers should note that moisture accelerates leaching; we recommend Karl Fischer titration of solvents to maintain water content below 50 ppm. For bulk storage considerations that affect iodide stability, refer to our guide on Bulk 1-Ethyl-4-(4-Iodophenyl)Benzene: Light Sensitivity And Summer Storage Protocols.
Batch-Specific COA Parameters: Monitoring Trace Impurities and Halogen Content for Reproducible Herbicide Synthesis
Reproducibility in multi-step herbicide synthesis demands rigorous batch-to-batch consistency. Our certificates of analysis (COA) for 1-ethyl-4-(4-iodophenyl)benzene include not only standard HPLC purity but also GC-MS quantification of key impurities: 4-ethylbiphenyl (dehalogenated byproduct), 4,4'-diethylbiphenyl (homocoupling product), and residual iodine. Total halogen content is controlled to ≤0.1% for the high-purity grade, as excess halides can interfere with downstream amination or esterification steps.
One edge-case behavior we have documented: in the presence of trace copper (from reactor corrosion), the compound can undergo Ullmann-type homocoupling even at ambient temperature, forming 4,4'-diethylbiphenyl. Our COA includes an ICP-MS limit for copper (<5 ppm) to mitigate this risk. For custom synthesis or technical support, our team can provide impurity profiles tailored to your specific herbicide scaffold.
Bulk Packaging and Handling: IBC and 210L Drum Solutions for Industrial-Scale Halogenated Biphenyl Intermediates
For industrial-scale herbicide production, we supply 1-ethyl-4-(4-iodophenyl)benzene in 210L steel drums with polyethylene liners or, for larger volumes, in 1000L IBCs. The solid is typically flaked or ground to facilitate dissolution in reaction solvents. Given its light sensitivity, all packaging is UV-protective; we recommend storage at 2–8°C in the dark. Our logistics team can arrange sea or air freight with temperature-controlled containers upon request.
As a global manufacturer, we maintain buffer stocks in key regions to reduce lead times. For procurement managers, we offer flexible MOQs starting at 1 kg for trials and scaling to multi-ton contracts. Our product page provides current pricing and availability: 1-Ethyl-4-(4-Iodophenyl)Benzene (CAS 17078-76-1) – High-Purity Intermediate.
Frequently Asked Questions
What is the minimum order quantity (MOQ) for 1-ethyl-4-(4-iodophenyl)benzene?
Our standard MOQ is 1 kg for sample evaluation. For commercial production, we can supply from 25 kg to multi-ton lots under long-term supply agreements.
Do you provide custom synthesis of related ethyl iodobiphenyl derivatives?
Yes, our R&D team can modify the biphenyl core or halogen pattern to meet specific herbicide intermediate requirements. Contact us with your target structure for a feasibility assessment.
What is the typical lead time for bulk orders?
For orders up to 100 kg, lead time is 2–3 weeks. Larger quantities may require 4–6 weeks, depending on current production schedules. We maintain safety stocks of high-purity grade for urgent needs.
How do you ensure batch-to-batch consistency for herbicide synthesis?
Each batch is released with a comprehensive COA including HPLC purity, melting point, appearance, and limits on 4-ethylbiphenyl, total halides, and copper. We also retain samples for 24 months for retrospective analysis.
Can you ship in temperature-controlled containers?
Yes, we offer refrigerated (2–8°C) sea and air freight options. Standard packaging is UV-protective 210L drums or IBCs.
Sourcing and Technical Support
Selecting a reliable source for 1-ethyl-4-(4-iodophenyl)benzene is critical to maintaining the efficiency of your herbicide synthesis pipeline. With our focus on consistent quality, transparent COA documentation, and industrial-scale packaging, NINGBO INNO PHARMCHEM is positioned as a strategic partner for agrochemical R&D and production. Partner with a verified manufacturer. Connect with our procurement specialists to lock in your supply agreements.