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Your search keyword '"Kikuchi, Takashi"' showing total 14 results
Start Over Author "Kikuchi, Takashi" Journal angewandte chemie
14 results on '"Kikuchi, Takashi"'

10. The Chameleonic Nature of Diazaperopyrenium Recognition Processes

Author

Basuray, Ashish N., primary, Jacquot de Rouville, Henri-Pierre, additional, Hartlieb, Karel J., additional, Kikuchi, Takashi, additional, Strutt, Nathan L., additional, Bruns, Carson J., additional, Ambrogio, Michael W., additional, Avestro, Alyssa-Jennifer, additional, Schneebeli, Severin T., additional, Fahrenbach, Albert C., additional, and Stoddart, J. Fraser, additional

Published
2012
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13. Selective Generation of Formamides through Photocatalytic CO2 Reduction Catalyzed by Ruthenium Carbonyl Compounds.

Author

Kobayashi, Katsuaki, Kikuchi, Takashi, Kitagawa, Susumu, and Tanaka, Koji

Subjects
*FORMAMIDE, *PHOTOCHEMICAL research, *RUTHENIUM catalysts, *RUTHENIUM compounds, *ELECTRON donors
Abstract

The selective formation of dialkyl formamides through photochemical CO2 reduction was developed as a means of utilizing CO2 as a C1 building block. Photochemical CO2 reduction catalyzed by a [Ru(bpy)2(CO)2]2+ (bpy: 2,2′-bipyridyl)/[Ru(bpy)3]2+/Me2NH/Me2NH2+ system in CH3CN selectively produced dimethylformamide. In this process a ruthenium carbamoyl complex ([Ru(bpy)2(CO)(CONMe2)]+ ) formed by the nucleophilic attack of Me2NH on [Ru(bpy)2(CO)2]2+ worked as the precursor to DMF. Thus Me2NH acted as both the sacrificial electron donor and the substrate, while Me2NH2+ functioned as the proton source. Similar photochemical CO2 reductions using R2NH and R2NH2+ (R=Et, nPr, or nBu) also afforded the corresponding dialkyl formamides (R2NCHO) together with HCOOH as a by-product. The main product from the CO2 reduction transitioned from R2NCHO to HCOOH with increases in the alkyl chain length of the R2NH. The selectivity between R2NCHO and HCOOH was found to depend on the rate of [Ru(bpy)2(CO)(CONR2)]+ formation. [ABSTRACT FROM AUTHOR]

Published
2014
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14. Quantitative Emergence of Hetero[4]rotaxanes by Template-Directed Click Chemistry.

Author

Ke, Chenfeng, Smaldone, Ronald A., Kikuchi, Takashi, Li, Hao, Davis, Anthony P., and Stoddart, J. Fraser

Abstract

In einem Ruck können Polyrotaxane bestehend aus bis zu 64 Ringen durch 1,3 ‐ dipolare Azid ‐ Alkin ‐ Cycloadditionen mit Cucurbit[6]uril als Templat in Gegenwart von Cyclodextrinen synthetisiert werden. Der Schlüssel zu diesem Prozess ist die Bildung von Wasserstoffbrücken, die Selbstsortierung und positive Kooperativität bewirken. Einfaches Mischen von sechs Komponenten (siehe Bild) liefert ein Hetero[4]rotaxan binnen einer Minute in quantitativer Ausbeute. [ABSTRACT FROM AUTHOR]

Published
2013
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