Go Hamasaka

Using soft X-ray absorption spectroscopy to evaluate the electronic structures of sp2-hybridized carbons in organic solvents

Masanari Nagasaka, Shintaro Okumura, Shun Ichii, Go Hamasaka et autres

The reactivity of an organic compound is often discussed in relation to the bond length at the reaction site. However, obtaining such information in organic solvents, where most organic reactions occur, remains a demanding task. Here, we analyze the electronic structures of …

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Author response for "Using soft X-ray absorption spectroscopy to evaluate the electronic structures of sp2-hybridized carbons in organic solvents"

Masanari Nagasaka, Shintaro Okumura, Shun Ichii, Go Hamasaka et autres

Development of AlN Fillers for Composite Resins with High Thermal Conductivity and Low Bond-Line Thickness

Yusaku Imasaku, Atushi Sanagawa, Isao Masada, Go Hamasaka et autres

Heat generation from electronic devices has become a significant issue due to increasing density of semiconductor devices. Thermal interface materials (TIM) are used as heat conductors between heat sources and heat sinks in electronic devices. As a filler for TIM, aluminum nitride …

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Using soft X-ray absorption spectroscopy to evaluate the electronic structures of sp 2 -hybridized carbons in organic solvents

Masanari Nagasaka, Shintaro Okumura, Shun Ichii, Go Hamasaka et autres

The electronic structures of organic molecules containing sp 2 carbons in organic solvents were probed using soft X-ray absorption spectroscopy (Soft-XAS-OS), combined with inner-shell calculations.

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Using Soft X-ray Absorption Spectroscopy to Evaluate the Bond Lengths of sp2-hybridized Carbons in Organic Solvents: Tracking the C–Si Bond Length during the Hiyama Cross-Coupling Reaction

Shintaro Okumura, Masanari Nagasaka, Shun Ichii, Go Hamasaka et autres

The reactivity of an organic compound is often discussed in the context of the bond length at the site of the reaction. Yet, evaluating the length of a reactive bond in organic solvents to understand its reactivity, where the majority of an …

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Synthesis of Oligo(Triarylphosphine Sulfide)s for Stabilizing Pd Nanoparticles and Modulating Selective Semihydrogenation of Terminal Aryl Alkynes

Hidetoshi Ohta, Hajime Fujinaga, Keisuke Kanbara, Aya Tazawa et autres

Abstract In the development of high‐performance metal nanoparticle (NP) catalysts, the exploration of new classes of multidentate organic stabilizers is crucial. Herein, we report the synthesis of a series of structurally diverse oligo(triarylphosphine sulfide)s via the Pd‐catalyzed P–C cross‐coupling reactions of hydroxymethylphosphine …

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Surface Treatment of AlN Filler for Improvement of Reliability in Silicone Resin Composites

M. Takakusaki, Isao Masada, Yoshiyuki Iizuka, T. Hamasaka et autres

To release heat of integrated circuits and power devices, thermal interface material (TIM) is used as a heat conductor between a heat source and a heat sink. The increasing of the thermal conductivity of the fillers is necessary to increase the thermal …

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High Thermal Conductive Composite Resin Filled with Spherical and Polyhedral Aluminum Nitrides

Takefumi Iida, Atsushi Sakamoto, Isao Masada, Saiko Fujii et autres

To release heat of integrated circuits and power devices, thermal interface material (TIM) is used as a heat conductor between a heat source and a heat sink. High thermal conductivity and electrical insulation property are required in TIM, according to the high …

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Suzuki–Miyaura Cross-Coupling Reaction with Potassium Aryltrifluoroborate in Pure Water Using Recyclable Nanoparticle Catalyst

Atsushi Ohtaka, Misa Kawase, Kyosuke Matsuoka, Tsutomu Shinagawa et autres

Abstract This paper describes the Suzuki–Miyaura cross-coupling reaction of aryl bromides with potassium aryltrifluoroborates in water catalyzed by linear polystyrene-stabilized PdO nanoparticles (PS-PdONPs). The reaction of aryl bromides having electron-withdrawing groups or electron-donating groups took place smoothly to give the corresponding coupling …

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Arylation of Terminal Alkynes by Aryl Iodides Catalyzed by a Parts-per-Million Loading of Palladium Acetate

Go Hamasaka, David Roy, Aya Tazawa, Yasuhiro Uozumi

Arylation of terminal alkynes (16 varieties) by aryl iodides (28 varieties) was achieved with a mol ppm loading level of palladium catalyst, where a variety of functional groups including heteroarenes were tolerated. Thus, the arylations were carried out in the presence of …

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CCDC 1911672: Experimental Crystal Structure Determination

Shun Ichii, Go Hamasaka, Yasuhiro Uozumi

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

The Hiyama Cross‐Coupling Reaction at Parts Per Million Levels of Pd: In Situ Formation of Highly Active Spirosilicates in Glycol Solvents

Shun Ichii, Go Hamasaka, Yasuhiro Uozumi

A palladium NNC-pincer complex at a 5 mol ppm loading efficiently catalyzed the Hiyama coupling reaction of aryl bromides with aryl(trialkoxy)silanes in propylene glycol to give the corresponding biaryls in excellent yields. This method was applied to the syntheses of adapalene and …

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