Synthesis, Chemistry and Structure of Some 1,1-Dimethylcyclopropazulenes

Abstract

dimethylcycloprop[f]azulene derivatives were prepared through a short synthesis from thiophene-1,1-dioxides using a Houk-Leaver azulene synthesis. The strain caused by the fusion of the cyclopropane ring had no effect on electrophilic aromatic sub-stitution reactions. X-ray structures of these compounds showed that cycloprop[e]azulenes have no or very small strain induced bond localisation, whereas cycloprop[f]azulene shows some minor localisation.[a] Dr.

Efficient Synthesis and Structural Analysis of Chiral 4,4′‐Biazulene

“…The authors have cited additional references within the Supporting Information. [32][33][34][35][36][37][38][39][40][41][42][43][44][45]…”

Kinetic stabilization allows structural analysis of a benzoborirene

“…A prominent example is strain induced bond localization (SIBL) in aromatic compounds. 19–31 In the context of SIBL, benzoborirene ( 1 , Scheme 1) served as a model system even before its experimental existence could be confirmed. 20,32–34 Benzoborirene is isoelectronic to the benzocyclopropenium ion, which is hard to characterize fully due to its limited stability.…”