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Your search keyword '"Takagi, Taisei"' showing total 10 results
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10 results on '"Takagi, Taisei"'

1. Tohoku Fukushi University students' Geographical Cognition about Foreign Countries and Japanese Prefectures : Analyzing Geographical awareness survey results of Students Attending 'Chishi（Regional Geography）'

Author

Kawabata, Ibuki, Sito, Yushi, Matsuda, Shintaro, Ojima, Shun, Kumagai, Koyota, Takagi, Taisei, Takahashi, Kota, Ohuchi, Akari, Kameya, Reo, Sato, Tsuyoshi, Asakawa, Toshio, Tohoku Fukushi University Geography Seminar, Miura, Shunpei, Maesono, Taichi, Hoshi, Jogi, and Ando, Nozomi

Subjects
地理認識, honokiyama, 大学生, 地理教育, suminar activity, Geographical education, Geographical skill
Abstract

「地誌」授業で、2016年度から世界の10か国及び日本の10都県の位置について、受講生がどの程度認識しているか調査してきた結果を、①高校での地理科目履修状況との関係、②正答率の経年変化、③誤答の傾向に分けて分析・考察した。①では、世界の地理認識について正答率が低い国で地理科目履修者の正答率が未履修者を上回る傾向がみられる。②では、変化パターンから、調査した10か国は、正答率が上昇傾向、低下傾向、調査年により上昇・低下、ほぼ一定の4グループに、10都県は、上昇傾向、調査年により上昇・低下、ほぼ一定の3グループに分けられる。③では、世界の地理認識について、正答の国に近接またはその国が属する地域の国を誤答、名称の似た地域・国を誤答、全く別の地域の国を誤答という三つの誤答パターンが、日本の地理認識については、隣接または正答の県が含まれる地方の県を誤答、全く別地方の県を誤答という二つの誤答パターンが認められる。

Published
2020

9. Benchtop-Stable Hypervalent Bromine(III) Compounds: Versatile Strategy and Platform for Air- and Moisture-Stable λ 3 -Bromanes.

Author

Miyamoto K, Saito M, Tsuji S, Takagi T, Shiro M, Uchiyama M, and Ochiai M

Abstract

We present the first synthesis of air/moisture-stable λ 3 -bromanes ( 9 and 10 ) by using a cyclic 1,2-benzbromoxol-3-one (BBX) strategy. X-ray crystallography and NMR and IR spectroscopy of N -triflylimino-λ 3 -bromane ( 12 ) revealed that the bromine(III) center is effectively stabilized by intramolecular R-Br-O hypervalent bonding. This strategy enables the synthesis of a variety of air-, moisture-, and benchtop-stable Br-hydroxy, -acetoxy, -alkynyl, -aryl, and bis[(trifluoromethyl)sulfonyl]methylide λ 3 -bromane derivatives.

Published
2021
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10. Shelf-Stable ( E )- and ( Z )-Vinyl-λ 3 -chlorane: A Stereospecific Hyper-vinylating Agent.

Author

Watanabe Y, Takagi T, Miyamoto K, Kanazawa J, and Uchiyama M

Subjects
Borates, Hydrocarbons, Aromatic
Abstract

We report the first stereoselective synthesis of stable ( E )- and ( Z )-β-chlorovinyl-λ 3 -chlorane via direct mesitylation of 1,2-dichloroethylene with mesityldiazonium tetrakis(pentafluorophenyl)borate under mild reaction conditions. The structure of the ( E )-vinyl-λ 3 -chlorane was established by single-crystal X-ray analysis. Because of the enormously high leaving group ability of the aryl-λ 3 -chloranyl group, vinyl-λ 3 -chloranes undergo not only S N Vσ-type reaction with extremely weak nucleophiles such as perfluoroalkanesulfonate, iodobenzene, and aromatic hydrocarbons but also coupling with phenylcopper(I) species.

Published
2020
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