Synthesis, crystal structure, and physical properties of sterically unprotected hydrocarbon radicals |
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| Authors: | Kubo Takashi Katada Yoshiki Shimizu Akihiro Hirao Yasukazu Sato Kazunobu Takui Takeji Uruichi Mikio Yakushi Kyuya Haddon Robert C |
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| Affiliation: | Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. kubo@chem.sci.osaka-u.ac.jp |
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| Abstract: | We have prepared and isolated neutral polycyclic hydrocarbon radicals. A butyl-substituted radical gave single crystals, in which a π-dimeric structure, not a σ-bonded dimer, was observed, even though steric protection was absent. Thermodynamic stabilization due to the highly spin-delocalized structure contributes effectively to the suppression of σ-bond formation. |
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