Overview
3,4-Dichlorophenyl isocyanate (3,4-DCPI) is an organic compound belonging to the isocyanate family, widely utilized in chemical synthesis. Its reactive isocyanate group (-NCO) makes it valuable for forming carbamates and ureas, which are key intermediates in agrochemicals and pharmaceuticals. The compound is known for its moisture sensitivity and requires careful handling to prevent unwanted reactions. The industrial production of 3,4-DCPI involves the reaction of 3,4-dichloroaniline with phosgene or its derivatives. Due to its reactivity, it is typically supplied in sealed containers under inert gas to avoid degradation. Its applications span across pesticide formulation and specialized pharmaceutical synthesis.
Physical and Chemical Properties
3,4-Dichlorophenyl isocyanate is a colorless to pale yellow liquid with a characteristic pungent odor. It has a molecular weight of 188.01 g/mol and a density of approximately 1.32 g/cm³. The compound reacts vigorously with water, alcohols, and amines, releasing carbon dioxide and forming corresponding derivatives. Its boiling point ranges between 230-232°C, and it is soluble in common organic solvents such as toluene, dichloromethane, and acetone. The isocyanate group's high reactivity necessitates storage under anhydrous conditions to prevent polymerization or decomposition.
Main Applications
3,4-DCPI is primarily employed in the synthesis of agrochemicals, including herbicides and insecticides. Its ability to form stable carbamate linkages makes it a preferred intermediate in pesticide manufacturing. For instance, it is used in producing phenylurea herbicides, which are effective in pre-emergent weed control. In the pharmaceutical industry, 3,4-DCPI serves as a building block for active pharmaceutical ingredients (APIs). It is utilized in the synthesis of compounds with antidiabetic or antimicrobial properties. The compound's versatility in organic synthesis ensures its demand in specialized chemical production.
Safety and Storage
Due to its toxicity and irritant properties, 3,4-Dichlorophenyl isocyanate requires strict safety measures during handling. Exposure can cause severe skin, eye, and respiratory irritation. Personal protective equipment (PPE), including gloves, goggles, and respirators, is mandatory. Storage must be in tightly sealed containers under inert gas (e.g., nitrogen) to prevent moisture ingress. The compound should be kept in a cool, well-ventilated area away from incompatible substances like water, acids, and bases. Spills must be neutralized with specialized absorbents and disposed of as hazardous waste.
B2B Procurement Guide
When procuring 3,4-DCPI, buyers should prioritize suppliers with certifications for chemical handling and storage. Key considerations include verifying the CAS number (102-36-3), purity (typically ≥98%), and moisture content (≤0.1%). Batch-specific COAs (Certificates of Analysis) are essential for quality assurance. Pricing varies based on quantity and supplier location, with reference ranges around $50-$100 per kg. Bulk purchases may offer discounts, but storage limitations should be evaluated. Logistics must ensure temperature-controlled transport to prevent degradation. Always confirm regulatory compliance for regional import/export restrictions.
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