Author
Chikako Takayama
Other affiliations: De La Salle University
Bio: Chikako Takayama is an academic researcher from Sophia University. The author has contributed to research in topics: Cyclopentadienyl complex & Moiety. The author has an hindex of 11, co-authored 18 publications receiving 248 citations. Previous affiliations of Chikako Takayama include De La Salle University.
Topics: Cyclopentadienyl complex, Moiety, Ylide, Norbornadiene, Cobalt
Papers
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TL;DR: In this article, a series of alkylidene-bridged metalladithiolene complexes were analyzed by cyclic voltammetry and it was shown that both reduction and oxidation weaken the M-S-C and S-C bonds in the triangle ring.
42 citations
TL;DR: In this paper, the reduction halfwave potential values of the imido-bridged complexes depend on the substituent of bridging moiety, and they showed that the reductant of the original complex is regenerated not by the first reduction, but by the second reduction according to CV and OTTLE measurements.
32 citations
TL;DR: In this article, the reaction of an alkylidene-bridged dithiolene complex with trimethyl phosphite results in the formation of a novel type of sulfonium ylide coordinated to a cobalt atom.
20 citations
TL;DR: In this article, the structure of the adduct 2a was re-investigated and determined by X-ray structural analysis, and the rhodiadithiolene complexes and those adducts showed the catalytic activities for the thermal isomerization from Q to norbornadiene (NBD).
18 citations
TL;DR: In this paper, the title reaction resulted in desulfurization in the thiocarbonyl ligand to produce a new complex with a novel planar ligand, [CpCoS2C2S2CC(CN)2].
15 citations
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TL;DR: This review surveys the different ligands that have been used to support palladium-catalyzed aerobic oxidation reactions and describes mechanistic insights into the role played by the ancillary ligand.
Abstract: Palladium-catalyzed aerobic oxidation reactions have been the focus of industrial application and extensive research efforts for nearly 60 years. A significant transition occurred in this field approximately 20 years ago, with the introduction of catalysts supported by ancillary ligands. The ligands play crucial roles in the reactions, including promotion of direct oxidation of palladium(0) by O2, bypassing the typical requirement for Cu salts or related redox cocatalysts to facilitate oxidation of the reduced Pd catalyst; facilitation of key bond-breaking and bond-forming steps during substrate oxidation; and modulation of chemo-, regio-, or stereoselectivity of a reaction. The use of ligands has contributed to significant expansion of the scope of accessible aerobic oxidation reactions. Increased understanding of the role of ancillary ligands should promote the development of new synthetic transformations, enable improved control over the reaction selectivity, and improve catalyst activity and stability...
391 citations
TL;DR: The 1,3dithiole-2-thione-4,5-dithiolate ligand and chalcogen atom substituted isologs have been extensively used in organic and coordination chemistry since their first reported synthesis in 1975.
212 citations
TL;DR: In this article, a Ru-doped ZnIn2S4 catalyst was used to photocatalyse the dehydrogenative C−C coupling of methylfurans, forming both hydrogen and diesel fuel precursors.
Abstract: Photocatalytic hydrogen production from biomass is a promising alternative to water splitting thanks to the oxidation half-reaction being more facile and its ability to simultaneously produce solar fuels and value-added chemicals. Here, we demonstrate the coproduction of H2 and diesel fuel precursors from lignocellulose-derived methylfurans via acceptorless dehydrogenative C−C coupling, using a Ru-doped ZnIn2S4 catalyst and driven by visible light. With this chemistry, up to 1.04 g gcatalyst−1 h−1 of diesel fuel precursors (~41% of which are precursors of branched-chain alkanes) are produced with selectivity higher than 96%, together with 6.0 mmol gcatalyst−1 h−1 of H2. Subsequent hydrodeoxygenation reactions yield the desired diesel fuels comprising straight- and branched-chain alkanes. We suggest that Ru dopants, substituted in the position of indium ions in the ZnIn2S4 matrix, improve charge separation efficiency, thereby accelerating C−H activation for the coproduction of H2 and diesel fuel precursors. Biomass can be used to scavenge photogenerated holes in photocatalytic hydrogen production, but the oxidized molecules that form are not always useful products. Here, the authors use Ru-ZnIn2S4 to photocatalyse the dehydrogenative C−C coupling of lignocellulose-derived methylfurans, forming both hydrogen and diesel fuel precursors.
203 citations
TL;DR: In this article, the mononuclear 16-electron dithio-o-carboranylcobalt(III) complex CpCo(S2C2B10H10) (2) was obtained by the reaction of CpCO(CO)I2 with dilithium DIBs.
103 citations
TL;DR: The MESPsteric value showed a good linear correlation with the cone angle values as well as the average of the intervalence HPH angles found in the QM layer, which confirmed the present approach to understanding the steric effect separately from the electronic effect.
Abstract: A two-layer ONIOM(B3LYP/6-31G(d,p):UFF) quantum mechanics (QM)−molecular mechanics (MM) optimization of PR3 ligands, where the QM layer is always constructed as PH3, followed by molecular electrostatic potential (MESP) analysis of the QM layer is suggested as a simple and effective method for evaluating the steric effect of PR3 ligands. The subtle variations in the electron distribution that arise as a result of the steric bulkiness as well as the conformational changes in the substituent groups is well reflected in the value of the MESP minimum (Vmin) located in the QM region. In general, a sterically bulky group has always shown a more negative Vmin than a sterically less bulky group. The difference between the Vmin value of free PH3 and the Vmin value at the QM region of PR3 is used as a measure of the steric effect of the PR3 ligand. This value, designated as MESPsteric, showed a good linear correlation with the cone angle values as well as the average of the intervalence HPH angles found in the QM la...
96 citations