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Benzvalene

Benzvalene is an organic compound and one of several isomers of benzene. It was first synthesized in 1967 by K. E. Wilzbach et al. via photolysis of benzene and the synthesis was later improved by Thomas J. Katz et al.

The 1971 synthesis consisted of treating cyclopentadiene with methyllithium in dimethyl ether and then with dichloromethane and methyllithium in dimethyl ether at −45 °C. It can also be formed in low yield (along with fulvene and Dewar benzene) by irradiation of benzene at 237 to 254 nm. The hydrocarbon in solution was described as having an extremely foul odor. Due to the high steric strain present in benzvalene, the pure compound (~71 kcal/mol higher in energy than benzene) easily detonates, for example by scratching.

The compound converts to benzene with a chemical half-life of approximately 10 days. This symmetry-forbidden transition is believed to take place through a diradical intermediate.

Polybenzvalene

Benzvalene can be polymerized in a ring opening metathesis polymerisation to polybenzvalene. This polymer contains highly strained bicyclobutane rings which again makes it a sensitive material. The rings can be isomerized to 1,3-dienes and for this reason polybenzvalene has been investigated as a precursor to polyacetylene.

References

References

  1. (1981). "Benzvalene—Properties and Synthetic Potential". Angewandte Chemie International Edition in English.
  2. (1967). "Benzvalene, the Tricyclic Valence Isomer of Benzene". [[Journal of the American Chemical Society]].
  3. (1971). "Benzvalene synthesis". [[Journal of the American Chemical Society]].
  4. (1999). "Synthesis of Benzvalene". The Journal of Organic Chemistry.
  5. (1968-06-01). "Photolysis of benzene vapor. Benzvalene formation at wavelengths 2537-2370 A". Journal of the American Chemical Society.
  6. (1972). "Rearrangements and interconversions of compounds of the formula (CH)n". Chemical Reviews.
  7. (1988). "Strained rings as a source of unsaturation: polybenzvalene, a new soluble polyacetylene precursor". Journal of the American Chemical Society.
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tricyclic-compounds cyclopentenes explosive-chemicals substances-discovered-in-the-1970s
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