Inside Cover: Ultra‐fast One‐Handed Helix Induction and Its Static Helicity Memory in a Poly(biphenylylacetylene) with a Catalytic Amount of Chiral Ammonium Salts (Angew. Chem. Int. Ed. 15/2023)

Abstract

Catalytic ultra‐fast helix induction and its static helicity memory in a poly(biphenylylacetylene) were achieved by using chiral ammonium salts, as reported by Katsuhiro Maeda, Eiji Yashima, and co‐workers in their Research Article (e202217020). The remarkable acceleration of the helix‐induction rate accompanied by strong chiral amplification relies on crown‐ether‐like specific intermolecular complex formation of the two methoxymethoxy groups of the biphenyl pendants with chiral ammonium species.

Conformational Kinetics in Chiral Poly(diphenylacetylene)s: A Dynamic P/M Memory Effect

“…[14,[36][37] This phenomenon was denoted as "memory effect". [38] They found that this process can be extrapolated to other polyacetylene derivatives, such as poly(biphenylacetylene)s (PBPA) [39][40] and poly(diphenylacetylene)s (PDPAs). [41][42] These systems were recently denoted as first-(PPAs), second-(PBPAs) and third-(PDPAs) generation of static helicity memory respectively.…”