Synthesis and identification of a trimethylenemethane derivative pi-extended with three pyridinyl radicals.
A trimethylenemethane (TMM) derivative 1(2*), in which the parent TMM is pi-extended by the symmetric insertion of three pyridine rings into the C-C bonds of TMM, has been synthesized by the alkali metal reduction of the isolated corresponding dication. Although the frozen-glass X-band cw-ESR spectrum of 1(2*) gave unresolved fine structures due to the small ZFS parameters, pulsed ESR two-dimensional electron spin transient nutation (2D-ESTN) spectroscopy unambiguously can afford to identify diradical 1(2*) as a triplet species.
Matsumoto
Kouzou
K
Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. kmatsu@chem.sci.osaka-u.ac.jp
Inokuchi
Daisuke
D
Hirao
Yasukazu
Y
Kurata
Hiroyuki
H
Sato
Kazunobu
K
Takui
Takeji
T
Kubo
Takashi
T