Construction of polymeric delta-graph: a doubly fused tricyclic topology.
A doubly fused tricyclic polymer architecture, corresponding to a delta-graph, has been constructed effectively through metathesis polymer cyclization (MPC) of an 8-shaped dicyclic polymer precursor having two allyl groups placed at opposite positions of the two rings of the 8-shaped structure. The 8-shaped polymer precursor has been obtained through the covalent conversion of an electrostatic self-assembly (composed of two units of the linear poly(tetrahydrofuran)s, poly(THF)s, having pyrrolidinium salt end groups and having a pendant allyl group at the middle of the chain, carrying a tetrafunctional carboxylate counteranion) by the heating treatment under appropriate dilution to cause the ring-opening reaction of pyrrolidinium salt groups by carboxylate anions.
Tezuka
Yasuyuki
Y
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8552 Japan. ytezuka@o.cc.titech.ac.jp
Fujiyama
Kohsuke
K