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Benzo[3,4]cyclobuta[1,2-d]tropone

โœ Scribed by Ross K. McCulloch; Dieter Wege

Publisher
Elsevier Science
Year
1976
Tongue
French
Weight
182 KB
Volume
17
Category
Article
ISSN
0040-4039

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โœฆ Synopsis

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[l,2-clthiophene 3,2 3 benzo[3,4]cyclobuta[l,2]tropylium cation 4, and benzo[3,4]cyclobuta[l,2-cltropone 5.4 Much of the interest in these ring systems centres around the question of the extent of r-electron delocalixation, and hence on the degree of antiaromatic and paramagnetic character of the central 4-membered ring. Of particular interest in this regard is benzo[3,4]cyclobuta[l,2-d] tropone 6, which possesses a formal benzocyclobutadienoid double bond. The high a-bond character of the 4b-9a bond can in principle be

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