Overview
N-Hydroxyphthalimide (NHPI) is an organocatalyst and synthetic intermediate with the formula C8H5NO3. First synthesized in the mid-20th century, it gained prominence for its ability to generate phthalimide-N-oxyl (PINO) radicals under mild conditions. These radicals participate in selective oxidation reactions, making NHPI valuable in green chemistry initiatives. In industrial contexts, NHPI is classified as a specialty chemical with niche applications. Its role as a co-catalyst in hydrocarbon oxidations (e.g., cyclohexane to adipic acid) reduces reliance on heavy metal catalysts. The compound is typically supplied as a crystalline powder with >98% purity for commercial use.
Physical and Chemical Properties
NHPI appears as a white to off-white powder with moderate solubility in polar aprotic solvents like dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). Its crystalline structure decomposes at ~200-205°C without a distinct boiling point. The molecule's stability arises from resonance within the phthalimide ring system. Key chemical behavior includes radical formation under aerobic conditions. When combined with oxygen or peroxides, NHPI generates PINO radicals that abstract hydrogen atoms from substrates. This property underpins its catalytic applications. The compound shows low solubility in non-polar solvents and water, requiring solvent optimization for reactions.
Main Applications
NHPI serves primarily as a catalyst in oxidation processes. In petrochemical refining, it enables the conversion of cyclohexane to KA oil (cyclohexanol/cyclohexanone mixture), a precursor for nylon production. The mechanism involves radical chain reactions with higher selectivity than traditional cobalt catalysts. Pharmaceutical applications include synthesizing nitroxy radicals for drug intermediates. NHPI also modifies polymers through radical grafting reactions. Emerging uses span fine chemical synthesis and environmental chemistry, such as degrading pollutants via advanced oxidation processes (AOPs).
Safety and Storage
NHPI poses moderate hazards as a dust irritant. Safety data sheets classify it as harmful if inhaled (H332) and a skin/eye irritant (H315/H319). Laboratories and plants should use local exhaust ventilation and personal protective equipment (PPE) including nitrile gloves and safety goggles. Storage requires airtight containers in cool (<25°C), dry conditions away from oxidizers. Shelf life typically exceeds 2 years when properly sealed. In case of spills, absorb with inert material and dispose as hazardous waste. Firefighting measures recommend dry chemical powder for small fires.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering batch-specific certificates of analysis (COA) with HPLC purity data. Technical specifications should confirm ≤1% moisture content and particle size consistency (e.g., 80-100 mesh). Bulk purchases (100kg+) often qualify for 10-15% discounts. Logistics considerations include moisture-proof packaging (double-layer polyethylene bags) for international shipments. Top-producing regions include China, India, and Germany. For trial orders, request 100g lab samples to test compatibility with intended processes. Audit suppliers for ISO 9001 certification and REACH compliance.
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