Recent interest in aromatic analogues of biphenylene in which one benzenoid ring is replaced by five membered 6n electron systemsIs prompts us to report our synthesis of the title triene 5 and the derived tropylium salt 11. -The latter is a derivative of biphenylene in which a benzenoid ring is rep
Benzo[3,4]cyclobuta[1,2-b]thiophene
โ Scribed by J.W. Barton; D.J. Lapham
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- French
- Weight
- 119 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
The synthesis of thieno[3,2-clcinnoline is described; this compound gives benzo [3,4]cyclobuta[1,2-blthiophene.
vapour phase thermolysis of
The considerable stability of biphenylene, a system containing fused 4n and (4n+2) ITelectron rings, is associated with the fact that its structure corresponds closely to the canonical form (l),l which has a low total bond order, i.e. little cyclobutadiene character, in the four-membered ring.
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## Syntheses of the benzodicinnolines (3) and ( 4), and their vacuum thermolysis to give the title compound (l), are reported. The effects which arise from the fusion of small, strained rings 192 and of potentially
During recent years, a considerably amount of attention has been devoted to the synthesis of aromatic analogues of biphenylene 1, in which one bensenoid ring is replaced by another (an + 2)x electron system. Compounds which have been prepared include the norbiphenylene anion 2l , benzo[3,4]cyclobuta
Following our synthesis of the benzo[3,4]cyclobutap,2]tropylium cation', we have been actively engaged in investigating routes to the three possible isomeric benzo [3,4]cyclobuta[l,2]troPones 2, 3, and $.
Current interest in strained systems resulting from the fusion of more than one small, strained ring onto a benzene nucleus has led to the recent synthesis of molecules such as 1,2,5,6-tetrahydrodicyclobuta[a,c]benzene (l).l