Faculty Profiles - YOSHIDA Yoshiaki

Papers - YOSHIDA Yoshiaki

Division display41 - 48 of about 48／ All the affair displays >>

Synthesis and solid state helix to helix rearrangement of poly(phenylacetylene) bearing n-octyl alkyl side chains Reviewed

Motoshige A., Mawatari Y., Yoshida Y., Motoshige R., Tabata M.

Polymer Chemistry 5 ( 3 ) 971 - 978 2014.02

Synthesis and helix pitch control of π-conjugated helical polymers with accordion-like oscillation Reviewed

Yoshida Y., Mawatari Y., Tabata M.

Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry 72 ( 3 ) 292 - 302 2014.01

Authorship：Lead author Language：English Publishing type：Article, review, commentary, editorial, etc. (scientific journal)

Poly(alkyl propiolate)s (PAP), e.g., Poly(n-heptyl propiolate (PnHepP) and Poly((s)-2-octyl propiolate) (Ps2OctP) having an achiral or a chiral ester side chain were stereoregularly prepared with a Rh complex catalyst, [Rh(nbd Cl] 2 (nbd = norbornadiene), at 40 °C in methanol, respectively. The temperature dependence 1H and 13 C NMR spectra of PAPs and their spectral simulations indicated that the restricted rotation around the ester O-C bond takes place through the socalled 3-site jump conformation. The spectra also exhibited that the helical conjugated main-chain of Ps2OctP was largely oscillating between the sequences of contracted helix and stretched helix in the time scale of the NMRs, although the degree of the oscilation of PnHepP was fairly small compared to that of Ps2OctP. The UV-vis and IR spectra of them supported that PAPs have at least two helical conformations, i.e., contracted and stretched helices. Therefore, these spectra supported the oscillation of the helix along the main-chain axis. The proposed model calculated by MMFF94 also indicated the accordion-like helix oscillation of contracted and stretched helices (HELIOS) of PAPs which was synchronized with restricted 3-site jump rotation around the ester O-C bond in the side-chain.

DOI： 10.5059/yukigoseikyokaishi.72.292

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84902346091&origin=inward

Contracted Helix to Stretched Helix Rearrangement of an Aromatic Polyacetylene Prepared in n-Hexane with [Rh(norbornadiene)Cl]2 -triethylamine Catalyst Reviewed International journal

Asahi Motoshige, Yasuteru Mawatari, Ranko Motoshigea, Yoshiaki Yoshida, and Masayoshi Tabata

Journal of Polymer Science Part A: Polymer Chemistry ( John Wiley & Sons ) 51 ( 24 ) 5177 - 5183 2013.10

Helix oscillation of polyacetylene esters detected by dynamic 1H NMR, IR, and UV-vis methods in solution Reviewed International journal

Yoshiaki Yoshida, Yasuteru Mawatari, Asahi Motoshige, Ranko Motodshige, Toshifumi Hiraoki, Masayoshi Tabata

Polymer. Chemistry ( Royal Society of Chemistry ) 4 ( 10 ) 2982 - 2988 2013.03

Accordion-like Oscillation of Contracted and Stretched Helices of Polyacetylenes Synchronized with the Restricted Rotation of Side Chains Reviewed International journal

Yoshiaki Yoshida, Yasuteru Mawatari, Asahi Motoshige, Ranko Motoshige, Toshifumi Hiraoki, Manfred Wagner, Klaus Müllen, Masayoshi Tabata

Journal of the American Chemical Society ( ACS Publications ) 135 ( 10 ) 4110 - 4116 2013.02

Irreversible Helix Rearrangement from Cis-transoid to Cis-cisoid in Poly(p-n-hexyloxyphenylacetylene) Induced by Heat-treatment in Solid Phase Reviewed International journal

Asahi Motoshige, Yasuteru Mawatari, Yoshiaki Yoshida, Chigusa Seki, Haruo Matsuyama, and Masayoshi Tabata

Journal of Polymer Science Part A: Polymer Chemistry ( John Wiley & Sons ) 50 ( 15 ) 3008 - 3015 2012.08

Geometrical Structures in Solution and Solid Phase of Poly(propargyl ester)s Prepared by Using a [Rh(norbornadiene)Cl]2-cocatalyst Reviewed International journal

Yoshiaki Yoshida, Yasuteru Mawatari, Chigusa Seki, Toshifumi Hiraoki, Haruo Matsuyama, and Masayoshi Tabata

Polymer ( Elsevier Ltd. ) 52 ( 18 ) 3917 - 3924 2011.08

Cis and trans radicals generated in helical poly(propargyl acetate)s prepared using a [Rh(norbornadiene)Cl]2 catalyst Reviewed International journal

Yoshiaki Yoshida, Yasuteru Mawatari, Chigusa Seki, Toshifumi Hiraoki, Haruo Matsuyama, Masayoshi Tabata

Polymer ( Elsevier Ltd. ) 52 ( 3 ) 646 - 651 2011.02

　 PREV -NEXT　

<YOSHIDA Yoshiaki>

Papers - YOSHIDA Yoshiaki