Overview
Tropolone is a non-benzenoid aromatic compound characterized by a seven-membered carbon ring with a hydroxyl and a carbonyl group. It exhibits unique chemical properties due to its aromaticity and ability to form stable complexes with metals. Tropolone derivatives are significant in various industrial and pharmaceutical applications. First isolated in 1945, tropolone has since been studied extensively for its reactivity and utility in organic synthesis. Its structure allows it to act as a ligand in coordination chemistry, making it valuable in catalytic processes and metal extraction.
Physical and Chemical Properties
Tropolone is a pale yellow to brown crystalline solid with a molecular weight of 122.12 g/mol. It has a density of 1.28 g/cm³ and melts at 50-52 °C. The compound is soluble in water and common organic solvents like ethanol and acetone. Chemically, tropolone is weakly acidic (pKa ~6.7) and can form stable complexes with transition metals such as copper, iron, and aluminum. Its aromaticity arises from a conjugated system of π-electrons, making it reactive in electrophilic substitution reactions.
Main Applications
Tropolone is widely used in organic synthesis as a building block for pharmaceuticals, agrochemicals, and specialty chemicals. Its metal-chelating properties make it useful in catalysis and as a corrosion inhibitor in industrial processes. In the pharmaceutical industry, tropolone derivatives exhibit antimicrobial, antifungal, and anti-inflammatory activities. They are also explored for potential anticancer properties. Additionally, tropolone serves as a ligand in analytical chemistry for metal ion detection and separation.
Safety and Storage
Tropolone is an irritant to skin, eyes, and respiratory systems. Proper personal protective equipment (PPE), including gloves and goggles, should be worn when handling. Ensure adequate ventilation to avoid inhalation of dust or vapors. Store tropolone in a cool, dry place, away from light and oxidizing agents. Sealed containers are recommended to prevent moisture absorption and degradation. Shelf life is typically 2-3 years under optimal conditions.
B2B Procurement Guide
When procuring tropolone, prioritize suppliers with certifications (e.g., ISO, GMP) to ensure quality and consistency. Key specifications to verify include purity (98-99% is common), moisture content, and heavy metal residues. Bulk purchases (25 kg drums or larger) often reduce costs, but confirm storage compatibility. Request safety data sheets (SDS) and technical support for application-specific guidance. Prices vary based on purity and order volume, typically ranging from $50-$200 per kg.
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