[n]Radialenes are alicyclic organic compounds containing n cross-conjugated exocyclic double bonds.[1][2][3][4] The double bonds are commonly alkene groups but those with a carbonyl (C=O) group are also called radialenes.[5] For some members the unsubstituted parent radialenes are elusive but many substituted derivatives are known.
Radialenes are related to open-chain dendralenes and also to compounds like butadiene and benzene which also consist of a ring of sp2 hybridized carbon atoms.
Radialenes are investigated in organic chemistry for their unusual properties and reactivity but have not ventured outside the laboratory. Reported uses are as experimental building blocks for novel organic conductors and ferromagnets.[6] The first radialene called hexaethylidencyclohexane was synthesised in 1961.[7]
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