Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202110766
Keywords
cyclic polymers; photochemistry; stilbene; stimuli-responsive materials; supramolecular chemistry
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Funding
- National Natural Science Foundation of China [21922110, 21871245]
- Fundamental Research Funds for the Central Universities [WK3450000005]
- Starry Night Science Fund at Shanghai Institute for Advanced Study, Zhejiang University [SNZJU-SIAS-006]
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In this study, supramolecular confinement was utilized to efficiently synthesize cyclic polymers via photochemical methods. The highly directional hydrogen bonds introduced to the photoreactive cyanostilbenes facilitated [2+2] photo-cycloaddition reactions, resulting in the formation of cyclic polymers with high synthetic efficiency.
Efficient synthesis of cyclic polymers has received much attention in polymer chemistry field. Although photochemical cycloaddition of terminal p-bonded units provides a plausible way toward cyclic polymerization, it remains challenging to avoid side reactions by manipulating the reaction selectivity. Herein supramolecular confinement has been developed as a promising strategy to address this issue, by introducing highly directional hydrogen bonds to the photoreactive cyanostilbenes. The cyanostilbenes units on both ends of a telechelic macromonomer are orientationally aligned with high local concentrations, yielding [2+2] photo-cycloaddition products upon 430 nm light irradiation. It leads to the formation of cyclic polymers in the self-assembled state, in stark contrast to Z-E isomerization of cyanostilbenes in the monomeric state. Overall, supramolecular confinement effect exemplified in the current study provides new avenues toward cyclic topological polymers with high synthetic efficiency.
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