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青色フラビリウムイオンの合成と無機固体材料への吸着による繰り返し利用可能なpH 試験剤への利用
田中友子, 黒木千絵, 有井秀和
宮崎大学教育学部紀要 98 102 - 111 2022年3月
担当区分：責任著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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フラビリウムイオンをゼオライトに吸着させた繰り返し利用可能なpH試験剤の調製 査読あり
黒木千絵, 有井秀和
九州地区国立大学教育系・文系論文集 8 ( 2 ) No5-1 - No5-7 2022年3月
担当区分：責任著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Arii H., Nakao K., Masuda H., Kawashima T.
ACS Omega 7 ( 6 ) 5166 - 5175 2022年2月
担当区分：筆頭著者 記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ACS Omega
A strong Lewis acid silylium ion was utilized for dehydrogenative annulation between dialkyl(1-naphthyl)silanes 1 and aldehydes 2. Silane 1a was reacted with [Ph3C][B(C6F5)4] in the presence of 2,6-di-tert-butyl-4-methylpyridine and aldehydes 2 to afford the annulation product, 1-silabenzo[d,e]isochromanes 3, in moderate isolated yields. The annulation occurred only at the 8-position on the 1-naphthyl group. The silylium ion-promoted hydrosilylation proceeded competitively to afford silyl ethers 4 via the same intermediates, silylcarboxonium ions, in the dehydrogenative annulation. The ratio of 3 and 4 was affected by solvents and the electronic properties of aromatic aldehydes; for example, the use of less polar solvents and that of benzaldehydes with an electron-withdrawing group at the para-position predominantly yielded 3. This annulation reaction was applicable to aldehydes bearing a heteroaromatic group and aliphatic alkyl groups. Judging from these results, both the formation of silylcarboxonium ions by in situ-generated silylium ions and the electrophilic aromatic substitution are important for this annulation reaction.
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Ishii T., Criniti G., Bykova E., Dubrovinsky L., Katsura T., Arii H., Kojitani H., Akaogi M.
American Mineralogist 106 ( 7 ) 1105 - 1112 2021年7月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：American Mineralogist
Three single crystals of CaTi2O4 (CT)-type, CaFe2O4 (CF)-type, and new low-density CaFe2O4 (LD-CF) related MgAl2O4 were synthesized at 27 GPa and 2500 °C and also CT-type MgAl2O4 at 45 GPa and 1727 °C using conventional and advanced multi-anvil technologies, respectively.The structures of CT-type and LD-CF related MgAl2O4 were analyzed by single-crystal X-ray diffraction. The lattice parameters of the CT-type phases synthesized at 27 and 45 GPa were a = 2.7903(4), b = 9.2132(10), and c = 9.3968(12) Å, and a = 2.7982(6), b = 9.2532(15), and c = 9.4461(16) Å, respectively, (Z = 4, space group: Cmcm) at ambient conditions. This phase has an AlO6 octahedral site and an MgO8 bicapped trigonal prism with two longer cation-oxygen bonds. The LD-CF related phase has a novel structure with orthorhombic symmetry (space group: Pnma), and lattice parameters of a = 9.207(2), b = 3.0118(6), and c = 9.739(2) Å (Z = 4). The structural framework comprises tunnel-shaped spaces constructed by edge- and corner-sharing of AlO6 and a 4+1 AlO5 trigonal bipyramid, in which MgO5 trigonal bipyramids are accommodated. The CF-type MgAl2O4 also has the same space group of Pnma but a slightly different atomic arrangement, with Mg and Al coordination numbers of 8 and 6, respectively. The LD-CF related phase has the lowest density of 3.50 g/cm3 among MgAl2O4 polymorphs, despite its high-pressure synthesis from the spinel-type phase (3.58 g/cm3), indicating that the LD-CF related phase formed via back-transformation from a high-pressure phase during the recovery. Combined with the previously determined phase relations, the phase transition between CF-and CT-type MgAl2O4 is expected to have a steep Clapeyron slope. Therefore, CT-type phase may be stable in basaltic- and continental-crust compositions at higher temperatures than the average mantle geotherm in the wide pressure range of the lower mantle. The LD-CF related phase could be found in shocked meteorites and used for estimating shock conditions.
DOI： 10.2138/am-2021-7619
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Synthesis of Germacyclic Compounds by Cyclization and Annulation Reactions Utilizing In Situ Generated Germyl Cations 査読あり
Hidekazu Arii, Yaeko Iwanami, Daisuke Nakane, Hideki Masuda, Jin Matsumoto, Tsutomu Shiragami, Kunio Mochida, Takayuki Kawashima
Organometallics 40 ( 9 ) 1363 - 1370 2021年5月
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ジヒドロジシランから誘導される多核¬白金–ケイ素錯体の合成 招待あり
有井 秀和, 持田 邦夫
ケイ素化学協会誌 25 28 - 31 2010年11月
記述言語：日本語 掲載種別：記事・総説・解説・論説等（学術雑誌）