title: Regio- and stereo-selective intermolecular [2+2] cycloaddition of allenol esters with C60leading to alkylidenecyclobutane-annulated fullerenes.
abstract: The intermolecular [2+2] cycloaddition of allenol esters, which were in situ generated by Pt-catalyzed 1,3-acyloxy migration of propargylic esters, with C60proceeded regio- and stereo-selectively to give a novel class of alkylidenecyclobutane-annulated fullerenes. The cyclobutane-annulated fullerene derivatives have high-lying LUMO levels, which gave a high open-circuit voltage in organic solar cell applications. The observed high electron mobility provided a good fill factor compared with the PCBM-based devices.
authors: Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan. ueda@c.s.osakafu-u.ac.jp, ryu@c.s.osakafu-u.ac.jp.
authors: Mitsuhiro
authors: M
authors: Ueda
authors: Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan. ueda@c.s.osakafu-u.ac.jp, ryu@c.s.osakafu-u.ac.jp.
authors: Tsukasa
authors: T
authors: Sakaguchi
authors: Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan. ueda@c.s.osakafu-u.ac.jp, ryu@c.s.osakafu-u.ac.jp.
authors: Miho
authors: M
authors: Hayama
authors: Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. matsuo@photon.t.u-tokyo.ac.jp.
authors: Takafumi
authors: T
authors: Nakagawa
authors: Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. matsuo@photon.t.u-tokyo.ac.jp and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors: Yutaka
authors: Y
authors: Matsuo
authors: Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan. ueda@c.s.osakafu-u.ac.jp, ryu@c.s.osakafu-u.ac.jp.
authors: Aiko
authors: A
authors: Munechika
authors: Institute for Advanced & Core Technology, Showa Denko K.K., Chiba 267-0056, Japan.
authors: Shunsuke
authors: S
authors: Yoshida
authors: Institute for Advanced & Core Technology, Showa Denko K.K., Chiba 267-0056, Japan.
authors: Hiroshi
authors: H
authors: Yasuda
authors: Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan. ueda@c.s.osakafu-u.ac.jp, ryu@c.s.osakafu-u.ac.jp.
authors: Ilhyong
authors: I
authors: Ryu