Indene is a combustible polycyclic hydrocarbon with
actinic blueprint C9H8. It is composed of a benzene ring alloyed with a
cyclopentene ring. This ambrosial aqueous is achromatic although samples
generally are anemic yellow. The arch automated use of indene is in the assembly
of indene/coumarone thermoplastic resins.
Indene occurs by itself in coal-tar fractions baking
about 175–185 °C. It can be acquired by heating this atom with sodium to
accelerate solid "sodio-indene." This footfall exploits indene's
anemic acidity apparent by its deprotonation by sodium to accord the indenyl
derivative. The sodio-indene is adapted aback to indene by beef distillation.
Indene readily polymerises. Oxidation of indene with acid
dichromate yields homophthalic acid (o-carboxylphenylacetic acid). It condenses
with ethyl oxalate in the attendance of sodium ethoxide to anatomy
indene-oxalic ester, and with aldehydes or ketones in the attendance of acrid
to anatomy benzofulvenes. The closing are awful coloured. An indene is aswell a
forerunner to the indenyl anion, a ligand in organometallic allure with some
credibility due to the indenyl effect.
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