Butalene
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Preferred IUPAC name Bicyclo[2.2.0]hexa-1,3,5-triene | |
Other names Butalene | |
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Properties | |
Chemical formula | C6H4 |
Molar mass | 76.098 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references |
Butalene is a polycyclic hydrocarbon composed of two fused cyclobutadiene rings.[1] A reported possible synthesis of it involves an elimination reaction from a Dewar benzene derivative. The structure itself can be envisioned as benzene with an internal bridge, and calculations indicate it is somewhat less stable than the open 1,4-didehydrobenzene biradical, the valence isomer in which that bridged bond is broken.
Structure and bonding
Ab initio calculations indicate butalene has a planar geometry and, in keeping with a planar structure with 6 π-electron configuration, is aromatic. Thus, the most significant π bonding interactions involve conjugation around the periphery of the whole six-atom structure, similar to benzene, rather than cross-ring resonance along the bridging bond.[2] Significant resonance around one or the other four-membered ring alone would be a less-stable antiaromatic form, as is seen in cyclobutadiene itself.
See also
References
- ^ Warner, Philip M.; Jones, Graham B. (2001). "Butalene and Related Compounds: Aromatic or Antiaromatic?". J. Am. Chem. Soc. 123 (42): 10322–10328. doi:10.1021/ja011134v. PMID 11603982.
- ^ Sakai, Shogo; Udagawa, Taro; Kita, Yuki (2009). "Theoretical Studies on the Structures and the Aromaticity for Condensed Cyclobutadienoids Series: The Combination of Kekulé Structures". J. Phys. Chem. A. 113 (50): 13964–13971. doi:10.1021/jp906258e. PMID 20000386.
- v
- t
- e
- Butalene
- Azulene
- Naphthalene
- Benz[a]anthracene
- Benzo[a]fluorene
- Benzo[c]fluorene
- Benzo[c]phenanthrene
- Chrysene
- Fluoranthene
- Pyrene
- Tetracene
- Triphenylene
- Tricyclobutabenzene
- Benz[e]acephenanthrylene
- Benzopyrene
- Benzo[a]pyrene
- Benzo[e]pyrene
- 6H-Benzo[cd]pyrene(Olympicene)
- Benzo[a]fluoranthene
- Benzo[b]fluoranthene
- Benzo[j]fluoranthene
- Benzo[k]fluoranthene
- trans-Bicalicene
- Dibenz[a,h]anthracene
- Dibenz[a,j]anthracene
- Pentacene
- Perylene
- Picene
- Tetraphenylene
- Anthanthrene
- Benzo[ghi]perylene
- Corannulene
- Dibenzopyrenes
- Hexacene
- Triangulene
- Zethrene