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Temperature‐Selective Dual Radical Generation from Alkyl Diiodide: Applications to Synthesis of Asymmetric CABC Multi‐Block Copolymers and Their Unique Assembly Structures
Author(s) -
Zheng Jie,
Wang ChenGang,
Yamaguchi Yu,
Miyamoto Michihiko,
Goto Atsushi
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201710964
Subject(s) - copolymer , alkyl , chemistry , radical , iodide , catalysis , polymer chemistry , combinatorial chemistry , organic chemistry , polymer
Temperature‐selective radical generation from a newly designed alkyl diiodide (I−R 2 −R 1 −I) was studied. R 1 −I and I−R 2 had different reactivities for generating alkyl radicals in the presence of a tetraoctylammonium iodide (ONI) catalyst. Taking advantage of the temperature selectivity, we used the alkyl diiodide as a dual initiator in ONI‐catalyzed living radical polymerization to uniquely synthesize CABC non‐symmetric multi‐block copolymers. Because of their non‐symmetric structure, CABC multi‐block copolymers form unique assemblies, that is, Janus‐type particles with hetero‐segment coronas and flower‐like particles with hetero‐segment petals.