Spin-localized cyclopentadienyl radical annelated with homoadamantene frameworks: isolation, X-ray crystal structure, and ESR characterization.
A cyclopentadienyl radical annelated with two homoadamantene frameworks 1 was synthesized and isolated in stable, crystalline form by the single-electron oxidation of the corresponding cyclopentadienyl anion. The X-ray structure clearly demonstrated distinct bond alternation in the cyclopentadienyl ring, suggesting that radical 1 has the characteristics of a spin-localized 2,4-cyclopentadien-1-yl radical. The two homoadamantene frameworks are nonequivalent in crystals at 100 K, while ESR spectra indicated that they are equivalent in toluene at room temperature due to rapid changes in conformation.
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan. kitagawa@scl.kyoto-u.ac.jp
Toshikazu
T
Kitagawa
Kohei
K
Ogawa
Koichi
K
Komatsu