p-Benzoquinone
Overview
p-Benzoquinone, systematically named 1,4-benzoquinone, is an organic compound with the formula C6H4O2. It is one of two isomers of benzoquinone, with the other being 1,2-benzoquinone (o-benzoquinone). This yellow crystalline solid is an important intermediate in chemical synthesis and industrial applications. First isolated in 1838, p-benzoquinone has since become a crucial compound in various industrial processes. Its ability to act as an oxidizing agent and its reactivity in organic transformations make it valuable for chemical manufacturing. Industrial grade p-benzoquinone typically has a purity of 98-99% and is supplied in crystalline form.
Physical and Chemical Properties
p-Benzoquinone appears as yellow monoclinic crystals with a characteristic pungent odor. It sublimes readily at room temperature and is volatile with steam. The compound is moderately soluble in organic solvents like ethanol and ether, but only slightly soluble in water. Chemically, p-benzoquinone is a strong oxidizing agent. It readily undergoes reduction to form hydroquinone (1,4-benzenediol). This redox behavior is fundamental to many of its applications. The compound is sensitive to light and heat, which can cause decomposition. It reacts with amines and other nucleophiles, making it useful in various organic syntheses.
Main Applications
The primary industrial use of p-benzoquinone is as an intermediate in the production of dyes and pigments. It serves as a building block for anthraquinone dyes, which are important in textile coloring. The photography industry utilizes p-benzoquinone in certain developing processes. In organic chemistry, it functions as an oxidizing agent and as a dienophile in Diels-Alder reactions. The polymer industry employs p-benzoquinone as a polymerization inhibitor for monomers like styrene and acrylic acid. Its redox properties make it valuable in electrochemical applications and as a catalyst in certain chemical processes.
Safety and Storage
p-Benzoquinone requires careful handling due to its toxic and irritant properties. It can cause severe eye damage and skin irritation, and is harmful if inhaled or swallowed. Appropriate personal protective equipment including gloves, goggles, and respiratory protection should be used when handling this chemical. For storage, p-benzoquinone should be kept in tightly sealed containers in a cool, dry place away from light. It must be separated from reducing agents and strong bases. The compound is stable under recommended storage conditions but may form explosive peroxides if contaminated or stored improperly for extended periods.
B2B Procurement Guide
When procuring industrial grade p-benzoquinone, buyers should specify purity requirements (typically 98-99% for industrial applications). Verify supplier certifications and request material safety data sheets (MSDS). Bulk quantities are commonly packaged in 25kg fiber drums or larger containers. Consider transportation requirements, as p-benzoquinone is classified as hazardous material for transport. Evaluate suppliers based on consistent quality, reliable delivery schedules, and proper handling procedures. Price negotiations should consider order volume, with discounts typically available for larger purchases. Always confirm current regulatory compliance for your specific region or industry.
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