High Quality Content by WIKIPEDIA articles! Prismane is a polycyclic hydrocarbon with the formula C6H6. It is an isomer of benzene, more specific: a valence isomer. Prismane is far less stable than benzene. The carbon (and hydrogen) atoms of the prismane molecule are arranged in the shape of a six-atom triangular prism. Albert Ladenburg proposed this structure for the compound now known as benzene. The compound was not synthesized until 1973. Discussion about the structure of benzene in the mid 19th century yielded several structures for the formula C6H6, which was accessible by combustion analysis. The first, proposed by Kekule in 1867, later proved to be the right one. This structure inspired several others to come up with concurring structures; for example, Ladenburg with prismane, Dewar with Dewar benzene, and Koerner and Claus with Claus' benzene. Some of these structures could be synthesized in the following years.

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