Industrial Purity Phenyliodine Diacetate Specifications
- Assay Requirement: Minimum 99.00% purity for consistent oxidative reaction yields.
- Physical Constants: Melting point range strictly maintained between 160°C and 165°C.
- Moisture Control: Loss on drying limited to 1% maximum to prevent hydrolysis during storage.
Phenyliodine(III) diacetate, commonly referred to as PIDA, is a critical hypervalent iodine reagent utilized extensively in modern organic synthesis. Its primary function serves as a mild yet effective oxidizing agent, facilitating transformations such as oxidative decarboxylation, ligand exchange, and the oxidation of alcohols to carbonyls. For process chemists and procurement managers, understanding the precise industrial purity specifications is paramount to ensuring reaction reproducibility and safety at scale.
As a leading global manufacturer, NINGBO INNO PHARMCHEM CO.,LTD. adheres to stringent quality control protocols to deliver reagents that meet the rigorous demands of pharmaceutical and fine chemical production. This technical overview details the critical parameters required for bulk procurement, focusing on analytical verification and stability.
Standard Industrial Purity Requirements for Phenyliodine(III) Diacetate
The efficacy of hypervalent iodine reagents in synthetic routes is directly correlated to their chemical purity. Impurities, particularly residual iodine or iodosobenzene derivatives, can lead to side reactions, reduced yields, or complications in downstream purification. Therefore, the standard specification for commercial grade material mandates an assay of no less than 99.00%.
The physical appearance serves as an initial quality indicator. High-grade material presents as a white to off-white crystalline powder. Deviations in color, such as yellowing, often indicate decomposition or the presence of elemental iodine. The molecular formula is C10H11IO4, with a molecular weight of 322.10 g/mol. Maintaining the correct crystalline structure is essential for solubility profiles in common organic solvents like dichloromethane or acetonitrile.
Thermal stability is another crucial factor. The melting point must fall within the narrow range of 160°C to 165°C. A depressed melting point usually signals the presence of volatile impurities or incomplete synthesis. During the manufacturing process, precise temperature control during crystallization ensures that the lattice energy remains consistent, thereby guaranteeing the thermal profile required for safe handling and reaction monitoring.
Analytical Methods for Verifying ≥99% Purity in Bulk Batches
To validate the quality of Iodosobenzene diacetate or Phenyliodine Diacetate batches, multiple analytical techniques are employed. Reliance on a single method is insufficient for industrial-grade certification. The following protocols are standard for verifying bulk shipments:
- High-Performance Liquid Chromatography (HPLC): This is the primary method for quantifying the main peak area. A purity of ≥99.0% is confirmed by comparing the sample against a certified reference standard.
- Proton Nuclear Magnetic Resonance (1H NMR): NMR spectroscopy identifies the structural integrity of the acetate groups and the aromatic protons. It is particularly useful for detecting organic impurities that may co-elute in chromatography.
- Karl Fischer Titration: Since the compound reacts with water, determining water content is vital. While Loss on Drying measures volatiles, Karl Fischer specifically quantifies water content to ensure hydrolytic stability.
- Inductively Coupled Plasma (ICP): For pharmaceutical applications, heavy metal residues must be tracked. ICP ensures that catalyst residues from the synthesis route are below regulatory thresholds.
When sourcing high-purity (Diacetoxyiodo)benzene for oxidative decarboxylation or other sensitive transformations, buyers should request full chromatograms alongside the certificate of analysis. This transparency ensures that the bulk price reflects the actual quality delivered, preventing costly batch failures in production.
COA Parameters: Loss on Drying, Melting Point, and Residual Solvents
The Certificate of Analysis (COA) is the definitive document for quality assurance. It provides the empirical data required to release material for production use. Key parameters on the COA must align with the physical and chemical properties established by international pharmacopeias and industrial standards.
Loss on Drying (LOD) is a critical specification, typically set at a maximum of 1% when tested at 60°C. Excessive moisture can trigger premature decomposition, releasing acetic acid and potentially forming explosive byproducts under confinement. Furthermore, residual solvents from the crystallization step, such as ethyl acetate or methanol, must be quantified using Gas Chromatography (GC) to ensure compliance with ICH Q3C guidelines.
The following table outlines the standard specification profile for industrial procurement:
| Parameter | Specification | Test Method |
|---|---|---|
| CAS Number | 3240-34-4 | Verification |
| Molecular Formula | C10H11IO4 | Calculation |
| Appearance | White to Off-White Crystalline Powder | Visual |
| Assay (Purity) | ≥ 99.00% | HPLC / Titration |
| Melting Point | 160°C – 165°C | DSC / Capillary |
| Loss on Drying | ≤ 1.0% (at 60°C) | Gravimetric |
| Solubility in Water | Reacts | Observation |
Safety, Storage, and Global Supply Chain Considerations
Handling hypervalent iodine compounds requires adherence to strict safety protocols. According to GHS classification, the material is an irritant (H315: Causes skin irritation; H319: Causes serious eye irritation). Proper personal protective equipment, including gloves and safety goggles, is mandatory during sampling and loading operations. The compound should be stored in a cool, dry, and well-ventilated area, protected from light and heat sources to prevent thermal decomposition.
For large-scale operations, supply chain reliability is as important as chemical specifications. NINGBO INNO PHARMCHEM CO.,LTD. ensures consistent availability through optimized production schedules and robust packaging solutions that mitigate moisture ingress during transit. Whether for use in LCD chemical production or pharmaceutical intermediate synthesis, securing a reliable source prevents production bottlenecks.
In conclusion, the procurement of Phenyliodine Diacetate requires a thorough evaluation of technical data sheets and COAs. By prioritizing industrial purity, verifying analytical methods, and partnering with a reputable global manufacturer, chemical companies can maintain high reaction yields and operational safety. Always verify the COA against your internal quality standards before integrating the material into your synthesis route.