Everything about Indene totally explained
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Indene is a
flammable polycyclic
hydrocarbon with
chemical formula C
9H
8. It is composed of a
benzene ring fused with a
cyclopentene ring and occurs as a colorless to pale yellow liquid. A principal industrial use of indene is in the production of indene/
cumarone thermoplastic resins.
It is also known as benzocyclopentadiene, and occurs naturally in
coal-tar fractions boiling around 175-185 °C. It can be obtained from this fraction by heating with
sodium (indene is acidic), separating the solid sodio-indene, and recovering by steam
distilling it.
Indene readily
polymerises. Oxidation of indene with acid
dichromate yields
homophthalic acid.
It condenses with
ethyl oxalate in the presence of
sodium ethoxide to form indene-oxalic ester, and with
aldehydes or
ketones in the presence of
alkali to form benzofulvenes. The latter are highly coloured.
Further Information
Get more info on 'Indene'.
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