著者
安東 直 伊藤 彰
出版者
一般社団法人日本建築学会
雑誌
建築雑誌 (ISSN:00038555)
巻号頁・発行日
vol.113, no.1419, pp.134-135, 1998-03-20
著者
加藤 昭一
出版者
The Association of Japanese Geographers
雑誌
地理学評論 (ISSN:00167444)
巻号頁・発行日
vol.32, no.5, pp.256-260, 1959-05-01 (Released:2008-12-24)
参考文献数
3

On the southern slope of Mt. Ogi and Momokura in Yamanashi Prefecture, there runs a thrust fault line where an easy slope lies toward the River Katsuraa Though it seems as if it were the river terrace of the River Katsura, the slope consists of rock dust called Miyatani rock-dust-bed containing rock-dustbed slate, hornfels, diorite and andesite and the fine material bed alternately. According to the results of my observation, it is 24.82 meters thick at Jakotsuzawa, and the Miyatani rock-dust-bed runs down with a dip of 8°_??_14° from Mt. Momokura to the River Katsura or the River Kuzuno, The upper part is seen even when the surface of the earth is cut, and blue-grayband of clay material containing tiny plantseeds lies in the lower. Judging from the facts I conclude as follows: 1) The bed rock is of the conglomerate of the River Katsura. 2) Upon the bed rock were deposited in the still water blue-gray band and Miyatani rock-dust-bed. 3) After that the bed rock was elevated and the present surface was formed, but rejuvenation took place again.
著者
秋元 惠一 金澤 寛 辻 安治 平山 義夫 今井 泰男 稲田 雅裕
出版者
公益社団法人 土木学会
雑誌
土木学会論文集
巻号頁・発行日
vol.1997, no.560, pp.43-55, 1997

昭和59年度より運輸省第二港湾建設局が実施している「東京国際空港沖合展開事業」の中核プロジェクトの一つである「新C滑走路」は, 計画どおり平成9年3月に供用を開始する予定である.<br>新C滑走路は, 東京湾内の浚渫工事から発生したヘドロや東京都内から発生した建設残土が捨て込まれて形成された人工の超軟弱地盤上に建設されている. 当該地区は埋立地盤の透水性の低さに起因して地下水位が高く, さらに残留沈下量も供用開始後50年で最大1.5m程度が予想される劣悪な環境下に置かれている. このため, 設計段階から, 特に高地下水位対策および残留沈下を見込んだ検討を行ってきたものであり, 本論文はこれら検討の概要と, 設計, 施工の成果について報告するものである.
著者
安孫子 淳
出版者
The Society of Synthetic Organic Chemistry, Japan
雑誌
有機合成化学協会誌 (ISSN:00379980)
巻号頁・発行日
vol.61, no.1, pp.24-34, 2003-01-01 (Released:2009-11-13)
参考文献数
14
被引用文献数
2 5

Boron-mediated aldol reaction of carboxylic esters is described in detail. Contrary to the gener-al belief that carboxylic esters are inert toward the conventional enolization conditions, propionate esters are shqwn to have adequate reactivity on the boron-mediated aldol reaction. More impor-tantly, the stereochemical course of the aldol reaction can be controlled by the judicious choice of the enolization reagents. Complementary anti- and syn-selective asymmetric aldol reaction of structurally related chiral esters are developed. Also, novel double aldol reaction is discovered with acetate esters, which provides a precursor to the synthesis of chiral triols of C3-symmetry. Extensive NMR experiments lead to characterize the first carbon-bound boron enolates and the novel doubly borylate enolates as intermediates of the double aldol reaction. A plausible mecha-nism of the double aldol reaction is proposed.

1 0 0 0 OA 重複不斉合成

著者
佐藤 恒夫 安孫子 淳 正宗 悟
出版者
The Society of Synthetic Organic Chemistry, Japan
雑誌
有機合成化学協会誌 (ISSN:00379980)
巻号頁・発行日
vol.44, no.4, pp.309-325, 1986-04-01 (Released:2010-01-22)
参考文献数
46
被引用文献数
2 5

This account examines double asymmetric induction from theoretical and practical viewpoints. In the context of four major organic reactions-the aldol, Diels-Alder, catalytic hydrogenation, and epoxidation-it is shown that a double asymmetric induction can be analyzed in terms of the single asymmetric reactions of each of the two chiral reactants. A rule which qualitatively relates the results of these single asymmetric reactions with the outcome of the double asymmetric reaction is proposed. A powerful new strategy based on this rule for the predictable creation of new chiral centers is discussed and the use of this strategy for the synthesis of sugars and macrolides is presented.
著者
安孫子 淳
出版者
The Society of Synthetic Organic Chemistry, Japan
雑誌
有機合成化学協会誌 (ISSN:00379980)
巻号頁・発行日
vol.54, no.7, pp.564-573, 1996-07-01 (Released:2010-01-28)
参考文献数
28
被引用文献数
2 3

New chiral auxiliaries based on the isoxazolidine skeleton have been developed. Characteristic feature of these auxiliaries are : 1) High reactivity for asymmetric alkylations. 2) Acylation of the auxiliary with an acid chloride and an amine, or DCC condensation. 3) One step transformation of the reaction products to the corresponding chiral alcohols, aldehydes and ketones without loss of the stereochemical integrity with the recovery of the auxiliary. Asymmetric alkylation of chiral β-substituted alkanols via their triflates lead to the easy access to the “reduced polypropionate units” as well as the first synthesis of the marine natural product (+) -siphonarienone. Enantiomerically pure axially dissymmetric cyclohexylidene compounds were synthesized using asymmetric Horner-Emmons reaction of the phosphonate derived from the auxilliary.
著者
釘原 直樹 三隅 二不二 佐藤 静一
出版者
The Japanese Group Dynamics Association
雑誌
実験社会心理学研究 (ISSN:03877973)
巻号頁・発行日
vol.20, no.1, pp.55-67, 1980
被引用文献数
1 2

本研究は新しく考案された装置を用いることによって集団の大きさが模擬被災状況における避難行動, 即ち, 脱出成功率や混雑発生の度合, 脱出や攻撃, 譲歩反応の生起, 競合過程に及ぼす効果について実験的に検討したものである.<BR>被験者は制限時間内に, 電気ショックがくるという危機的場面から脱出しなければならない状況におかれた. 但し, 脱出口は1つしかなく, しかも複数の人間が同時に通り抜けることはできないように実験事態が設定されていた. そのうえ, 1人が20秒 (脱出ボタン100回の打叩時間) 近くも脱出口を占拠する必要があった. 混雑が生じた際には, 被験者は攻撃か譲歩かまたは全然反応せず他者の反応を待つという3つの解決方法を執ることができた. 実験は暗室でおこなわれ, 聴覚はwhite noiseで他の音から遮断されていた.<BR>本実験の条件下において次の結果が見出された.<BR>1. 集団の大きさの変化にかかわらず, 1人当りの脱出許容時間を一定にした条件下で, 集団の大きさが増大すれば, それにともなって混雑が大きくなる. そして, 脱出率は低下する. 特に, 4人集団と5人集団の間の脱出率の低下が顕著であった.<BR>2. 集団サイズが大きい場合, 即ち, 7人, 9人の場合や小さい場合, 即ち, 3人, 4人の場合より, その中間の6人の場合に, 最も競争的反応がみられた. それは不安定な報酬構造という観点から解釈された.<BR>3. 時間経過に伴って攻撃反応が増大し, 譲歩反応が減少するような状況は全員脱出に失敗することが明らかになった.
著者
酒井 浄 中村 紀雄
出版者
The Society of Synthetic Organic Chemistry, Japan
雑誌
有機合成化学協会誌 (ISSN:00379980)
巻号頁・発行日
vol.36, no.2, pp.93-106, 1978-02-01 (Released:2009-11-13)
参考文献数
91
被引用文献数
2 2

Advances in Prostaglandin (PG) fields after the discovery of PGG2 and PGH2 are reviewed. Biological activities of PGG2, H2, I2 and TXA2 are briefly explained, and the synthetic studies on these new PGs reviewed. Improvements in the synthesis of primary PGs are also summarized.
著者
酒井 浄 末宗 洋
出版者
The Society of Synthetic Organic Chemistry, Japan
雑誌
有機合成化学協会誌 (ISSN:00379980)
巻号頁・発行日
vol.46, no.4, pp.334-343, 1988-04-01 (Released:2009-11-13)
参考文献数
48
被引用文献数
1 1

Starting with (+) - and (-) -limonenes as chiral synthons, syntheses of biologically active compounds such as prostaglandins, (+) -brefeldin A and nepetalactones have been studied. The key-step of these conversions is based on the stereoselective cyclization of 3, 4-disubstituted 4-pentenals into cis-3, 4-disubstituted cyclopentanones using the Rh (I) -complex.Ring cleavage and reconstruction of five and six membered rings under acetalization conditions are also discussed.
著者
末宗 洋
出版者
公益社団法人 日本薬学会
雑誌
YAKUGAKU ZASSHI (ISSN:00316903)
巻号頁・発行日
vol.112, no.7, pp.432-446, 1992-07-25 (Released:2008-05-30)
参考文献数
42
被引用文献数
4 6

The use of biocatalysts for the preparation of new chiral synthons has provided a novel synthetic route to the useful natural products. A method for the preparation of chiral carbocyclic alcohols has been also developed by utilizing the Pseudomonas fluorescens lipase (PFL)-catalyzed enantioselective hydrolysis. The above-mentioned alcohols have been found to be effective as chiral auxiliaries for asymmetric reactions.
著者
佐伯 清太郎 山下 絢子 盛中 泰洋 浜名 政和
出版者
The Pharmaceutical Society of Japan
雑誌
Chemical and Pharmaceutical Bulletin (ISSN:00092363)
巻号頁・発行日
vol.25, no.1, pp.79-86, 1977-01-25 (Released:2008-03-31)
被引用文献数
1 2

1, 1-Ethylenedioxy-9-(2-pyridyl) quinolizidine (1) was converted to N-ethoxycarbonylpyridinium salt (3) via monohydrobromide (2) by successive treatment with ammonium bromide and ethyl bromoacetate. The reaction of 3 with hydrochloric acid was markedly affected with the concentration of the acid. Thus, when 3 was heated with 15-20% hydrochloric acid, ring closure took place accompanied by hydrolysis of the ketal and ester groups and also decarboxylation to give 17-hydroxy compound (4). Heating with triethylamine gave dehydrated pyridinium salt (5) which was reduced with sodium borohydride and then catalytically to dl-allomatridine (6). On the other hand, heating 3 with 5-10% hydrochloric acid gave a carboxylic acid (9) which was also transformed into 6 through an ester (10) and a ring closure product (11) as shown in Chart 2. The action of 30% acid on 3 followed by the similar treatments afforded 1-hydroxy-9-(2-pyridyl) quinolizidine (7). Transformation of 1 to 17-hydroxyallomatridine (8) was further achieved successively by hydrolysis to 1-oxo compound (12), formation of its cyanohydrin (13) and hydrogenation over Raney nickel.