Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tetraphenylcyclopentadienone is a dark purple to black crystalline solid at standard temperature and pressure. Because of its highly conjugated nature, this organic compound can be analyzed in the UV spectrum. Tetraphenylcyclopentadienone has a "propeller" shape in its 3D conformation. The four phenyl rings are rotated out of the plane compared to the central ring because of steric repulsion with each other. These rings reduce the reactivity of the cyclopentadienone core by sterically blocking other reactants from getting close enough to it.
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