High Quality Content by WIKIPEDIA articles! Indene is a flammable polycyclic hydrocarbon with chemical formula C9H8. It is composed of a benzene ring fused with a cyclopentene ring. This aromatic liquid is colorless although samples often are pale yellow. The principal industrial use of indene is in the production of indene/coumarone thermoplastic resins. Indene occurs naturally in coal-tar fractions boiling around 175-185 °C. It can be obtained by heating this fraction with sodium to precipitate solid "sodio-indene." This step exploits indenes weak acidity evidenced by its deprotonation by sodium to give the indenyl derivative. The sodio-indene is converted back to indene by steam distillation.

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