Atsushi Ohtaka

Reaction‐Field‐Dependent Selective Ullmann Coupling Versus Hydrodebromination and Heck Reaction of Aryl Bromides

Hiroto Saga, Shiraki Ito, Ryosuke Shigeta, Aya Tazawa et autres

ABSTRACT A novel chemoselective regulation was achieved through deliberate modulation of the reaction field. When Pd aggregates were employed in reactions with aryl bromides, Ullmann coupling occurring on the Pd surface proceeds selectively. In contrast, ppm‐level Pd(OAc) 2 catalyzed hydrodebromination, which takes …

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Synthesis of azobenzene derivatives via oxidative coupling of anilines using a silver salt

Zichao Zhou, Kaito Sagara, Yoshimasa Matsumura, Osamu Shimomura et autres

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Robust High-Refractive-Index Polymer Films Enabled by a Bismuth–Dithiocarbamate Structure

Tomoaki TANAKA, Atsushi Ohtaka, Osamu Shimomura, Yoshimasa Matsumura

High-refractive-index polymers are essential materials for advanced optical devices. However, simultaneously achieving a high refractive index, material stability, and polymer processability remains challenging, particularly in systems containing heavy elements. In this study, we developed a molecular design strategy based on Bi–S bonding …

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Organic Polymer Supports Governing the Catalytic Activity of Metal Nanoparticles

Atsushi Ohtaka

本稿では有機高分子を担体とした金属ナノ粒子触媒に関する最近の研究動向のうち、高分子担体が触媒反応性に影響を及ぼした研究例を紹介する。具体的には「ポリイオン性液体の対アニオンによる反応選択性制御」、「担体のモルホロジーによる触媒活性制御」、および「多孔性有機高分子担持Pdナノ粒子触媒を用いた非対称ジアリールアセチレンからのインデノン類の位置選択的合成」を取り上げ、その特徴と意義について紹介する。

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Synthesis of Conductive Polymer Particles by Electroreductive Polymerization of Carbon Disulfide

Yoshimasa Matsumura, Taiki Yamada, Jun Yamaguchi, Yuya Atsuta et autres

CS₂ is produced by the reaction of sulfur with carbon-based materials such as charcoal and methane, which are widely available and cost-effective. Consequently, utilizing CS₂ as a precursor for functional materials can promote the advancement of sustainable industries. For instance, electrically conductive …

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Combustion reaction of layered zinc hydroxide salts intercalated with oxidant and fuel ions: A proof‐of‐concept study

Tsutomu Shinagawa, Atsushi Ohtaka

Abstract Reducing the thermal decomposition temperature and obtaining well‐crystallized oxides are present challenges in the formation of nanoporous oxides via topotactic transformation of layered metal hydroxides. Herein, we successfully synthesized combustible layered zinc hydroxides by intercalating nitrate and lactate as oxidants and …

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A method for recycling the Pd catalyst at molar ppm level

Shohei Masuu, Masahiro Goto, Saki Miyamoto, Tomoya Kiguchi et autres

Abstract Herein, we describe the preparation of poly(tetrafluoroethylene) (PTFE) materials, including a PTFE-coated magnetic stir bar and a PTFE vial, for the recycling of catalysts at the molar ppm level. Metal nanoparticles were consistently deposited onto the PTFE surface using straightforward and …

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N-Formylation of Secondary Amines and Their Application in the Synthesis of Benzimidazole Derivatives Using DMF as a C1 Source

Tomoya Sakaguchi, R. Nishio, Jun Tan, Ryuki Nakata et autres

Numerous methodologies for the N -formylation of amines using DMF as a formylating agent often require harsh conditions. Meanwhile, the synthesis of benzimidazole derivatives using DMF as a C1 source remains underexplored, with most methods relying on high temperatures and metal catalysts. …

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A Method for Recycling the Pd Catalyst at Molar ppm Level

Shohei Masuu, Masahiro Goto, Saki Miyamoto, Tomoya Kiguchi et autres

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DABCO-Intercalated α-Zirconium Phosphate as a Latent Thermal Catalyst in the Reaction of Urethane Synthesis

Osamu Shimomura, Yushi Arisaka, Astrid Rahmawati, Shekh Md. Mamun Kabir et autres

The mixture of hexamethylene diisocyanate (HDI) and butanol (BuOH) with the intercalation compound of 1,4-diazabicyclo[2.2.2]octane (DABCO) with α-zirconium phosphate (α-ZrP) has been evaluated as a latent thermal catalyst at varying temperatures. α-ZrP·DABCO did not show activity at 25 °C, but showed a …

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Preparation of Oriented Nanoporous Magnetite Films by a Template-Free Solution Process from Iron Oxyhydroxide Films

Tsutomu Shinagawa, Yuya Kanemoto, Atsushi Ohtaka

Nanoporous oxide films composed of nanocrystal assemblies with an aligned crystallographic orientation are key nanostructures for efficient interfacial reactions. However, a simple, template-free method for their formation remains a challenge. Layered metal hydroxide (LMH) films are a promising precursor for spontaneous formation …

Silver-Mediated Homocoupling of Arylboronic Acids

Atsushi Ohtaka, Tomoya Sakaguchi, K. FUKUOKA, Misa Kawase et autres

Abstract Here we describe a homocoupling reaction of arylboronic acid facilitated by silver carbonate, which proceeds smoothly in MeOH even at ambient temperature. The reaction exhibits broad functional group compatibility, affording a variety of symmetrical biaryls in satisfactory yields. Silver nanoparticles formed …

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