Synthesis, Chemistry and Structure of Some 1,1-Dimethylcyclopropazulenes
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1,1-Dimethylcycloprop[e]azulene and 1,1-dimethylcyclo-prop[f]azulene derivatives were prepared through a short syn-thesis from thiophene-1,1-dioxides using a Houk-Leaver azu-lene synthesis. The strain caused by the fusion of thecyclopropane ring had no effect on electrophilic aromatic sub-stitution reactions. X-ray structures of these compoundsshowed that cycloprop[e] azulenes have no or very small straininduced bond localisation, whereas cycloprop[f]azulene showssome minor localisation.