title: Regioselective cycloaddition of La2@I(h)-C80 with tetracyanoethylene oxide: formation of an endohedral dimetallofullerene adduct featuring enhanced electron-accepting character.
abstract: We describe the regioselective cycloaddition of La(2)@I(h)-C(80) with tetracyanoethylene oxide (TCNEO), which enabled the formation of the corresponding adduct having a tetracyanotetrahydrofuran moiety. X-ray crystallographic analysis revealed that the cycloaddition took place as a [5,6] addition. Along with dynamic swing motion of the metal atoms, the results of this electrochemical study demonstrate that TCNEO addition enhanced the electron-accepting character of La(2)@I(h)-C(80) and that the first reduction potential of the adduct reached -0.21 V versus the ferrocene/ferrocenium couple, which is the lowest value reported for endohedral metallofullerenes and their derivatives to date.
authors.affiliation: Department of Chemistry, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan.
authors.forename: Michio
authors.initials: M
authors.lastname: Yamada
authors.forename: Mari
authors.initials: M
authors.lastname: Minowa
authors.forename: Satoru
authors.initials: S
authors.lastname: Sato
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Slanina
authors.forename: Takahiro
authors.initials: T
authors.lastname: Tsuchiya
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Maeda
authors.forename: Shigeru
authors.initials: S
authors.lastname: Nagase
authors.forename: Takeshi
authors.initials: T
authors.lastname: Akasaka