Search Results - "Yashima, Eiji"

Synthesis and applications of helical polymers with dynamic and static memories of helicity by YASHIMA, Eiji

“…This review mainly highlights our studies on the synthesis of one-handed helical polymers with a static memory of helicity based on the noncovalent helicity…”
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Switchable enantioseparation based on macromolecular memory of a helical polyacetylene in the solid state by Shimomura, Kouhei, Ikai, Tomoyuki, Kanoh, Shigeyoshi, Yashima, Eiji, Maeda, Katsuhiro

“…In the chromatographic separation of enantiomers the order of elution is determined by the strength of diasteromeric interactions between the components of the…”
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Synthesis and structure determination of helical polymers by Yashima, Eiji

“…During the last decade, remarkable progress in developing synthetic helical polymers with a controlled helical sense has been achieved. However, the exact…”
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Stereospecific Synthesis of Enantiopure [6]Helicene Containing a Seven‐Membered Ring and [7]Helicene by Acid‐Promoted Stepwise Alkyne Annulations of Doubly Axial‐Chiral Precursors by Ikai, Tomoyuki, Oki, Kosuke, Yamakawa, Shoya, Yashima, Eiji

“…Enantiopure [6]helicene containing an embedded seven‐membered ring and carbo[7]helicene (>99 % ee) with opposite helicity were simultaneously and…”
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Single- and Double-Stranded Helical Polymers: Synthesis, Structures, and Functions by Yashima, Eiji, Maeda, Katsuhiro, Furusho, Yoshio

“…Biological macromolecules, such as DNA and proteins, possess a unique and specific ordered structure, such as a right-handed double helix or a single α-helix…”
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Unexpectedly Strong Chiral Amplification of Chiral/Achiral and Chiral/Chiral Copolymers of Biphenylylacetylenes and Further Enhancement/Inversion and Memory of the Macromolecular Helicity by Ishidate, Ryoma, Markvoort, Albert J, Maeda, Katsuhiro, Yashima, Eiji

“…We report an unexpectedly strong amplification of the macromolecular helicity in dynamic helical copolymers of chiral/achiral and chiral/chiral (R/S)…”
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Stimuli-responsive Molecular Springs Based on Single- and Multi-stranded Helical Structures by Ousaka, Naoki, Yashima, Eiji

“…A wide variety of synthetic molecular machines has been designed and synthesized to construct nanometer-scale assemblies whose molecular motions can be…”
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A Facile and Versatile Approach to Double N-Heterohelicenes: Tandem Oxidative CN Couplings of N-Heteroacenes via Cruciform Dimers by Sakamaki, Daisuke, Kumano, Daisuke, Yashima, Eiji, Seki, Shu

“…Novel double N‐hetero[5]helicenes that are composed of two nitrogen‐substituted heteropentacenes are synthesized by tandem oxidative CN couplings via the…”
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Remote Control of One‐Handed Helicity in Polyacetylenes through Flexible Spacers in Water: Impact of the Spacer Length by Ikai, Tomoyuki, Nakamura, Koshi, Mizumoto, Kosuke, Oki, Kosuke, Yashima, Eiji

“…We report the unprecedented sergeants and soldiers (S&S)‐type remote control of one‐handed helicity in copolymers of chiral/achiral biphenylylacetylenes…”
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Polysaccharide-based chiral stationary phases for high-performance liquid chromatographic enantioseparation by Yashima, Eiji

“…Recent developments of polysaccharide-based chiral stationary phases (CSPs) for the direct separation of enantiomers in high-performance liquid chromatography…”
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Direct Detection of Hardly Detectable Hidden Chirality of Hydrocarbons and Deuterated Isotopomers by a Helical Polyacetylene through Chiral Amplification and Memory by Maeda, Katsuhiro, Hirose, Daisuke, Okoshi, Natsuki, Shimomura, Kouhei, Wada, Yuya, Ikai, Tomoyuki, Kanoh, Shigeyoshi, Yashima, Eiji

“…We report the first direct chirality sensing of a series of chiral hydrocarbons and isotopically chiral compounds (deuterated isotopomers), which are almost…”
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One‐Handed Helical Tubular Ladder Polymers for Chromatographic Enantioseparation by Zheng, Wei, Oki, Kosuke, Saha, Ranajit, Hijikata, Yuh, Yashima, Eiji, Ikai, Tomoyuki

“…Defect‐free one‐handed contracted helical tubular ladder polymers with a π‐electron‐rich cylindrical helical cavity were synthesized by alkyne benzannulations…”
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Pulsating Tubules from Noncovalent Macrocycles by Huang, Zhegang, Kang, Seong-Kyun, Banno, Motonori, Yamaguchi, Tomoko, Lee, Dongseon, Seok, Chaok, Yashima, Eiji, Lee, Myongsoo

“…Despite recent advances in synthetic nanometer-scale tubular assembly, conferral of dynamic response characteristics to the tubules remains a challenge. Here,…”
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Main-Chain Optically Active Riboflavin Polymer for Asymmetric Catalysis and Its Vapochromic Behavior by Iida, Hiroki, Iwahana, Soichiro, Mizoguchi, Tomohisa, Yashima, Eiji

“…A novel optically active polymer consisting of riboflavin units as the main chain (poly-1) was prepared from naturally occurring riboflavin (vitamin B2) in…”
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Spin Filtering Along Chiral Polymers by Mishra, Suryakant, Mondal, Amit Kumar, Smolinsky, Eilam Z. B., Naaman, Ron, Maeda, Katsuhiro, Nishimura, Tatsuya, Taniguchi, Tsuyoshi, Yoshida, Takumu, Takayama, Kokoro, Yashima, Eiji

“…Spin‐dependent conduction and polarization in chiral polymers were studied for polymers organized as self‐assembled monolayers with conduction along the…”
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Allosteric Regulation of Unidirectional Spring-like Motion of Double-Stranded Helicates by Suzuki, Yoshimasa, Nakamura, Taiki, Iida, Hiroki, Ousaka, Naoki, Yashima, Eiji

“…We report the unprecedented allosteric regulation of the extension and contraction motions of double-stranded spiroborate helicates composed of 4,4′-linked…”
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Chiral information harvesting in dendritic metallopeptides by Ousaka, Naoki, Takeyama, Yuki, Iida, Hiroki, Yashima, Eiji

“…Long-range communication of stereochemical information is common in biological systems, particularly in enzyme-catalysed reactions. Here, we report the remote…”
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Oxidative Esterification, Thioesterification, and Amidation of Aldehydes by a Two-Component Organocatalyst System Using a Chiral N-Heterocyclic Carbene and Redox-Active Riboflavin by Iwahana, Soichiro, Iida, Hiroki, Yashima, Eiji

“…Flavin of the month! Triazolium‐derived N‐heterocyclic carbenes (NHCs) and a flavin catalyzed the oxidative esterification, thioesterification, and amidation…”
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Guest-Induced Unidirectional Dual Rotary and Twisting Motions of a Spiroborate-Based Double-Stranded Helicate Containing a Bisporphyrin Unit by Yamamoto, Shinya, Iida, Hiroki, Yashima, Eiji

“…Influential guests: The intercalation of an electron‐deficient aromatic guest (shown in red) between the two porphyrin rings of an optically active,…”
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“Helix‐in‐Helix” Superstructure Formation through Encapsulation of Fullerene‐Bound Helical Peptides within a Helical Poly(methyl methacrylate) Cavity by Ousaka, Naoki, Mamiya, Fumihiko, Iwata, Yoshiaki, Nishimura, Katsuyuki, Yashima, Eiji

“…A one‐handed 310‐helical hexapeptide is efficiently encapsulated within the helical cavity of st‐PMMA when a fullerene (C60) derivative is introduced at the…”
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