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45.12 Product Class 12: Radialenes

DOI: 10.1055/sos-SD-045-00477

Iyoda, M.Science of Synthesis, (201045507.

General Introduction

Radialenes are cross-conjugated cyclic hydrocarbons with a general structure 1 (Scheme 1) of formula C2nH2n, with n ring atoms and n exocyclic double bonds. They are named similarly to annulenes, according to their ring size, i.e. [n]radialene.[‌1‌‌3‌] However, specific examples in this section will be named according to standard nomenclature conventions as oligoalkylidenecycloalkanes. Radialenes (e.g., 25) and their derivatives have been receiving growing attention from synthetic and physical chemists, materials scientists, and especially theoretical chemists.[‌4‌‌8‌] The introduction of electron-donating or -withdrawing substituents can convert radialenes into π-donors or π-acceptors, respectively, for preparing novel charge-transfer complexes and ionic salts.[‌9‌‌11‌] Furthermore, radialenes have been employed as molecular scaffolding[‌12‌] and molecular machinery.[‌13‌]

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