Výsledky vyhledávání - "Ryoma Ishidate"

Akademický článek

Catalytic one-handed helix-induction and memory of amphiphilic poly(biphenylylacetylene)s in water

Autor: Tomoyuki Ikai, Kosuke Mizumoto, Ryoma Ishidate, Winald R. Kitzmann, Riho Ikeda, Chiaki Yokota, Katsuhiro Maeda, Eiji Yashima

Publikováno v: Giant, Vol 2, Iss , Pp 100016- (2020)

A series of amphiphilic biphenylylacetylene-based homo- and copolymers (PBPAs) carrying chiral and/or achiral oligo(ethylene glycol) pendants at the 4′-position of the biphenyl units were synthesized and the amplification of the macromolecular heli

Externí odkaz: https://doaj.org/article/36dfbbb898004508a94b6c70e23a173c

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Chiral/Achiral Copolymers of Biphenylylacetylenes Bearing Various Substituents: Chiral Amplification through Copolymerization, Followed by Enhancement/Inversion and Memory of the Macromolecular Helicity

Autor: Tomoyuki Ikai, Eiji Yashima, Kazuya Inoue, Katsuhiro Maeda, Ryoma Ishidate, Kübra Kaygisiz

Publikováno v: Macromolecules. 53:973-981

A series of dynamic helical homo- and copolymers of chiral and/or achiral biphenylylacetylenes (PBPAs) bearing achiral methoxymethoxy or acetyloxy groups at the 2,2′-positions along with a chiral o...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::18c610d1a51a5454456cf89f528a7233
https://doi.org/10.1021/acs.macromol.9b02727

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Emergence of Highly Enantioselective Catalytic Activity in a Helical Polymer Mediated by Deracemization of Racemic Pendants

Autor: Tomoyuki Ikai, Katsuhiro Maeda, Nozomu Suzuki, Masaki Ito, Mitsuka Ando, Ryoma Ishidate, Eiji Yashima

Publikováno v: Journal of the American Chemical Society. 143(32)

Any polymers composed of racemic repeating units are obviously optically inactive and hence chiral functions, such as asymmetric catalysis, will not be expected at all. Contrary to such a preconceived notion, we report an unprecedented helical polyme

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f27953b68d8e1e1fb090438a31cfe651
https://pubmed.ncbi.nlm.nih.gov/34347469

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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

Autor: Albert J. Markvoort, Ryoma Ishidate, Eiji Yashima, Katsuhiro Maeda

Publikováno v: Journal of the American Chemical Society, 141(18), 7605-7614. American Chemical Society

We report an unexpectedly strong amplification of the macromolecular helicity in dynamic helical copolymers of chiral/achiral and chiral/chiral (R/S) biphenylylacetylenes in which the chiral residues are remote from the biphenyl pendants and further

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae13417ef45d9f458863d7da34cab89a
https://doi.org/10.1021/jacs.9b02904

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Helicity induction and memory effect in poly(biphenylylacetylene)s bearing various functional groups and their use as switchable chiral stationary phases for HPLC

Autor: Sato Toru, Tomoyuki Ikai, Katsuhiro Maeda, Ryoma Ishidate, Eiji Yashima, Shigeyoshi Kanoh

Publikováno v: Polymer Chemistry. 10:6260-6268

A series of poly(biphenylylacetylene)s (PBPAs) bearing various functional groups at the 4′-position of the biphenyl pendants were synthesized. The effects of the pendant functional groups on their macromolecular helicity induction and subsequent me

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8b41d0b483be40cd7c3f5bf5d89860f8
https://doi.org/10.1039/c9py01425j

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Chiral stationary phases consisting of π-conjugated polymers bearing glucose-linked biphenyl units: reversible switching of resolution abilities based on a coil-to-helix transition

Autor: Tomoyuki Ikai, Seiya Awata, Katsuhiro Maeda, Tomoya Kudo, Ryoma Ishidate, Shigeyoshi Kanoh

Publikováno v: Polymer Chemistry. 8:4190-4198

A series of optically active π-conjugated polymers (poly-2–poly-5) consisting of alternating thieno[3,4-b]thiophene and glucose-linked biphenyl units were synthesized through copolymerizations by Sonogashira–Hagihara cross-coupling. Absorption a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2148fb674bd9e89a1a8708142089f1c1
https://doi.org/10.1039/c7py00804j

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Catalytic one-handed helix-induction and memory of amphiphilic poly(biphenylylacetylene)s in water

Autor: Chiaki Yokota, Ryoma Ishidate, Eiji Yashima, Tomoyuki Ikai, Winald R. Kitzmann, Kosuke Mizumoto, Riho Ikeda, Katsuhiro Maeda

Publikováno v: Giant, Vol 2, Iss, Pp 100016-(2020)

A series of amphiphilic biphenylylacetylene-based homo- and copolymers (PBPAs) carrying chiral and/or achiral oligo(ethylene glycol) pendants at the 4’-position of the biphenyl units were synthesized and the amplification of the macromolecular heli

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9728dcab991a6ac0f6d275996bea6bf2
https://doi.org/10.1016/j.giant.2020.100016

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Macromolecular Helicity Induction and Memory in a Poly(biphenylylacetylene) Bearing an Ester Group and Its Application to a Chiral Stationary Phase for High-performance Liquid Chromatography

Autor: Kouhei Shimomura, Ryoma Ishidate, Tomoyuki Ikai, Katsuhiro Maeda, Shigeyoshi Kanoh

Publikováno v: Chemistry Letters. 44:946-948

An optically inactive poly(biphenylylacetylene) bearing an ester group at the 4′-position of the pendants formed a preferred-handed helical conformation and biased axial chirality in the pendants t...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::92555ac103d673dbc8030ddb2782ed49
https://doi.org/10.1246/cl.150299

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