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Band substances: The polymerization of C3O2 (see picture left, at −10 °C) into a red-brown, solid polymer (right) having identical composition has been known for almost 100 years. However, the constitution of the polymer remained unknown. Small-angle X-ray scattering studies of the dissolved polymer show that it forms a stiff bandlike molecule with approximately 40 monomeric units, thus confirming the predicted bandlike structure with condensed α-pyrone rings.
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Ballauff et al. (2004) studied this question.
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