2024-03-29T10:33:34Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/794752022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Programmed folding intospiro-multicyclic polymer topologies from linear and star-shaped chainsMato, YoshinobuHonda, KoheiRee, Brian J.Tajima, KenjiYamamoto, TakuyaDeguchi, TetsuoIsono, TakuyaSatoh, ToshifumiThe development of precise folding techniques for synthetic polymer chains that replicate the unique structures and functions of biopolymers has long been a key challenge. In particular,spiro-type (i.e., 8-, trefoil-, and quatrefoil-shaped) polymer topologies remain challenging due to their inherent structural complexity. Herein, we establish a folding strategy to producespiro-type multicyclic polymers via intramolecular ring-opening metathesis oligomerization of the norbornenyl groups attached at predetermined positions along a synthetic polymer precursor. This strategy provides easy access to the desiredspiro-type topological polymers with a controllable number of ring units and molecular weight while retaining narrow dispersity (& x189; < 1.1). This effective strategy marks an advancement in the development of functionalized materials composed of specific three-dimensional nanostructures. Intramolecular ring-opening metathesis oligomerisation is a useful method for constructing multicyclic polymer cages. Here, it is applied to the synthesis of spirocyclic polymers with figure-8, trefoil, and quatrefoil structures with low polydispersity.Nature Publishing GroupJournal Articlehttp://hdl.handle.net/2115/794752399-3669Communications Chemistry31972020-08-04enginfo:doi/10.1038/s42004-020-00355-4none