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Abstract

The synthesis and characterization of a stable, naphtho-fused fluorenyl radical derivative has been precisely constructed by a four-step synthesis. This open-shell graphene fragment is distinguished by a 13-π-electron system, featuring a non-alternating five-seven-membered ring (azulene moiety). Notably, this radical species demonstrates exceptional stability, with a half-life of 71.9 h at room temperature in toluene. More details are discussed in the article by Li et al. on pages 531—535.