Overview
Indene is an aromatic hydrocarbon consisting of a benzene ring fused with a cyclopentadiene ring. It is a colorless to pale yellow liquid with a distinctive aromatic odor. As an important intermediate in organic chemistry, indene serves as a building block for various chemical syntheses. First isolated from coal tar in the 19th century, indene has become a valuable industrial chemical. Its unique structure containing both aromatic and aliphatic unsaturation makes it chemically versatile. Modern production methods typically involve petroleum refining processes rather than coal tar extraction.
Physical and Chemical Properties
Indene exhibits typical aromatic hydrocarbon properties with additional reactivity from its cyclopentadiene moiety. The liquid has a density slightly less than water and boils at 182°C. Its insolubility in water but good solubility in common organic solvents like ethanol and ether makes it useful for various chemical processes. The compound's most notable chemical feature is its reactive double bond in the five-membered ring, which readily undergoes addition reactions. This reactivity, combined with its aromatic stability, allows indene to participate in diverse chemical transformations including polymerization, hydrogenation, and oxidation reactions.
Main Applications
The primary industrial use of indene is in the production of coumarone-indene resins, which are valuable thermoplastic materials. These resins find extensive application in paints, adhesives, rubber compounding, and printing inks due to their excellent solubility and compatibility properties. Indene also serves as a precursor for other important chemicals including indane, hydrindene, and various pharmaceutical intermediates. In specialty applications, it's used in fragrance compositions and as a starting material for certain dyes. Recent research explores its potential in organic electronics and advanced material synthesis.
Safety and Storage
As a flammable liquid, indene requires careful handling and storage. It should be kept in tightly sealed containers away from heat, sparks, and open flames. Storage areas should be well-ventilated and equipped with appropriate fire suppression systems. Personal protective equipment including chemical-resistant gloves, goggles, and proper ventilation should be used when handling indene. In case of spills, absorb with inert material and dispose of properly. The compound may cause skin and eye irritation upon contact, and inhalation of vapors should be avoided.
B2B Procurement Guide
When procuring indene for industrial use, buyers should specify required purity levels, which typically range from 95% to 99.5% depending on application. Technical grade is sufficient for resin production, while higher purity is needed for pharmaceutical applications. Reliable suppliers should provide proper certification including COA (Certificate of Analysis) and SDS (Safety Data Sheet). Bulk shipments are commonly available in drums or ISO tanks. Consider storage requirements and shelf life when ordering quantities, as indene can polymerize over time, especially when exposed to light and air.
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