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Your search keyword '"Tomoki Yoneda"' showing total 4 results
Start Over Author "Tomoki Yoneda" Journal chemical communications
4 results on '"Tomoki Yoneda"'

1. Alkali metal ion binding using cyclic polyketones

Author

Narito Ozawa, Kilingaru I. Shivakumar, Muthuchamy Murugavel, Yuya Inaba, Tomoki Yoneda, Yuki Ide, Jenny Pirillo, Yuh Hijikata, and Yasuhide Inokuma

Subjects
Materials Chemistry, Metals and Alloys, Ceramics and Composites, General Chemistry, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Abstract

Cyclic oligoketones composed of 3,3-dimethylpentane-2,4-diones showed crown ether-like alkali metal ion binding behavior with association constants up to 1.7 x 10(4) M-1 in chloroform/acetonitrile (v/v, 9/1). The binding properties have been used for catalysis in the Finkelstein reaction in a low-polarity solvent. Furthermore, novel ion-binding hosts were generated by terminal functionalization of linear polyketones.

Published
2022

2. PdII insertion-triggered meso-carbon extrusion of N-fused pentaphyrin to form N-fused sapphyrin PdII complexes

Author

Akito Nakai, Tomoki Yoneda, Takayuki Tanaka, and Atsuhiro Osuka

Subjects
Chemistry, Dimer, Metals and Alloys, chemistry.chemical_element, General Chemistry, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, Polymer chemistry, Materials Chemistry, Ceramics and Composites, Extrusion, Carbon
Abstract

meso-Carbon extrusion of N-fused [22]pentaphyrin(1.1.1.1.1) occurred upon its PdII complexation, giving N-fused [22]pentaphyrin (1.1.1.1.0) ([22]sapphyrin) PdII complexes 5 and 6 as 22π aromatic compounds. Oxidation of 5 with DDQ and Sc(OTf)3 gave directly C–N linked dimer 7.

Published
2021

3. Splitting and reorientation of π-conjugation by an unprecedented photo-rearrangement reaction

Author

Yuichi Kitagawa, Yasuchika Hasegawa, Tomoki Yoneda, Kiyoshi Miyata, Yasuhide Inokuma, and Yuya Inaba

Subjects
Carbon atom, Chemistry, Metals and Alloys, General Chemistry, Photochemistry, Catalysis, Spectral line, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Stereocenter, Π conjugation, Materials Chemistry, Ceramics and Composites, Rearrangement reaction, Absorption (chemistry)
Abstract

A dodecahexaene analogue cross-conjugated with four carbonyl groups was prepared from an aliphatic tetraketone. Exposure to LED light (>420 nm) led to the splitting of the dodecahexaene conjugation into two hexatriene subunits, connected through a stereogenic carbon atom. The two triene subunits exhibited excitonic coupling in the UV-Vis absorption and CD spectra.

Published
2020

4. A non-fused mono-meso-free pentaphyrin and its rhodium(i) complex

Author

Byung Sun Lee, Dongho Kim, Tomoki Yoneda, Min Chul Yoon, Atsuhiro Osuka, and Hirotaka Mori

Subjects
Stereochemistry, Metals and Alloys, chemistry.chemical_element, General Chemistry, Ring (chemistry), Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Rhodium, chemistry.chemical_compound, chemistry, Polymer chemistry, Materials Chemistry, Ceramics and Composites, Pyrrole
Abstract

5,10,15,20-Tetrakis(pentafluorophenyl) [22]pentaphyrin(1.1.1.1.1) 7 was synthesised and its bis-rhodium(I) complex 12 has been revealed to be a non-fused, yet planar pentaphyrin with an inverted pyrrole. Both 7 and 12 are aromatic, showing sharp Soret-like bands and diatropic ring currents.

Published
2012

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