title: A matrix isolation study of 2-isopropylidenecyclopentane-1,3-diyl (Berson-type diradical).
abstract: The photodenitrogenation of diazene 5 in an argon matrix at 10 K permitted the first observation of an IR spectrum of 2-isopropylidenecyclopentane-1,3-diyl 2 (a Berson-type diradical). A comparison of the IR spectrum with a vibrational simulation at the B3LYP/6-31G(d) level of theory revealed that the diradical 2 has a planar structure. The oxygen-trapping reaction of 2 produced regioselectively fused peroxide 6 in an oxygen-doped argon matrix at 10 K. Irradiation of the diradical 2 afforded enyne 8 in an argon matrix at 10 K.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka University (HANDAI), Suita565-0871, Osaka, Japan. abe@chem.eng.osaka-u.ac.jp
authors.forename: Manabu
authors.initials: M
authors.lastname: Abe
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kawanami
authors.forename: Araki
authors.initials: A
authors.lastname: Masuyama
authors.forename: Takashi
authors.initials: T
authors.lastname: Hayashi