Cross-Conjugated Systems in Acetylene-Extended Radiaannulene Frameworks

Cross-Conjugated Systems in Acetylene-Extended Radiaannulene Frameworks 

Recently, a hybrid radiaannulene 90 containing electron-donating TTFs and electron-accepting TEE moieties has been prepared by Nielsen and coworkers [86]. This system can be considered as a two-stage Weitz-type redox system, which leads to the aromatic 144t-annulene structure by either oxidation or reduction. Thus, CV analysis clearly showed three reversible oxidation waves corresponding to the formation of three redox states (+1/+2/+4) and showed two reversible reduction waves corresponding to two redox states (—1/—2). From the 

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