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Some were originally proposed for benzene itself before the actual structure of benzene was known. Others were later synthesized in lab. Some have been observed to isomerize to benzene, whereas others tend to undergo other reactions instead, or isomerize by ways other than pericyclic reactions. Some known valence isomers of benzene
It is an isomer of benzene, specifically 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—this compound is the parent and simplest member of the prismanes class of molecules.
As benzene is ubiquitous in gasoline and hydrocarbon fuels that are in use everywhere, human exposure to benzene is a global health problem. Benzene targets the liver, kidney, lung, heart and brain and can cause DNA strand breaks and chromosomal damage, hence is teratogenic and mutagenic. Benzene causes cancer in animals including humans.
-42.9·10 −6 cm 3 /mol ... Fulvene is an isomer of benzene, which when irradiated at 237 to 254 nm forms small amounts of fulvene along with benzvalene. [4]
In the petroleum refining and petrochemical industries, the initialism BTX refers to mixtures of benzene, toluene, and the three xylene isomers, all of which are aromatic hydrocarbons. The xylene isomers are distinguished by the designations ortho – (or o –), meta – (or m –), and para – (or p –) as indicated in the adjacent diagram.
The tetramethylbenzenes constitute a group of substances of aromatic hydrocarbons, which structure consists of a benzene ring with four methyl groups (–CH 3) as a substituent. [1] Through their different arrangement, they form three structural isomers with the molecular formula C 10 H 14. They also belong to the group of C 4-benzenes.
Benzvalene is an organic compound and one of several isomers of benzene. [1] It was first synthesized in 1967 by K. E. Wilzbach et al. [2] via photolysis of benzene and the synthesis was later improved by Thomas J. Katz et al. [3] [4]
1.092 126 741 043 54 × 10 22: C 52 H 106: n-dopentacontane: 53 2.155 777 191 357 26 × 10 19: 3.423 721 299 907 32 × 10 22: C 53 H 108: n-tripentacontane: 54 5.791 918 087 314 84 × 10 19: 1.074 254 564 589 75 × 10 23: C 54 H 110: n-tetrapentacontane: 55 1.557 454 318 575 50 × 10 20: 3.373 536 543 484 52 × 10 23: C 55 H 112: n ...