Abstract
Cyclopentadiene can be converted, catalytically by trichloroacetic acid (HA), into a brown-red polycyclopentadiene trichloroacetic acid ester (I). The colour of this adduct is due to conjugated double bonds1, which are also responsible for its proton acceptor properties2, namely, for the fast reversible reaction: where (II) is a blue salt-like adduct, formed by transfer of a proton from (HA) to (I).
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References
Nature, 168, 459 (1951).
Nature, 172, 73 (1953).
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BLAKELY, C., WASSERMANN, A. Absorption Spectrum of Deeply Coloured Cyclopentadiene Polymers. Nature 175, 219–220 (1955). https://doi.org/10.1038/175219a0
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DOI: https://doi.org/10.1038/175219a0
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