Valence Isomer
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High Quality Content by WIKIPEDIA articles! In organic chemistry, two molecules are valence isomers when they are constitutional isomers that can interconvert through pericyclic reactions. For example, Dewar benzene transforms spontaneously into its valence isomer benzene. The compounds both can be described as (CH)6 but the arrangement of the six carbon-hydrogen blocks is different. Besides benzene and Dewar benzene, prismane, benzvalene and bicyclopropenyl are also valence-isomers of the (CH)6 family. Topologically, more arrangements in this family are possible, though they have not been…mehr

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High Quality Content by WIKIPEDIA articles! In organic chemistry, two molecules are valence isomers when they are constitutional isomers that can interconvert through pericyclic reactions. For example, Dewar benzene transforms spontaneously into its valence isomer benzene. The compounds both can be described as (CH)6 but the arrangement of the six carbon-hydrogen blocks is different. Besides benzene and Dewar benzene, prismane, benzvalene and bicyclopropenyl are also valence-isomers of the (CH)6 family. Topologically, more arrangements in this family are possible, though they have not been attested to in chemistry. The strain on angles or lengths of bonding prohibit their actual formation.