著者

桜井 康雄 鈴木 教之 饗庭 健一 吉成 考正 川島 清隆 木原 和幸

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集C編 (ISSN:18848354)

巻号頁・発行日

vol.78, no.788, pp.1163-1169, 2012 (Released:2012-04-25)

参考文献数

4

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In this paper, a component restricting pressure change caused by oil temperature change is proposed. One of the merits of an oil-hydraulic system is to keep the value of oil pressure when pressurized oil is enclosed in a container. However, it is impossible to keep the value when the temperature of the oil is changed. Using a pressure control sub-system to prevent it, the whole system becomes complicated. In addition to it, the energy is consumed when the pressure is adjusted by the quantity of the oil flowing into or out the container. From these view points, it is effective to develop the component which prevents the pressure change according to the oil temperature change without the control of the quantity of the oil. Therefore, in this paper, a component to prevent the pressure change based on the oil temperature change is proposed to make the merit of oil-hydraulic system certain when the temperature of the oil is changed. And, in the cases where the temperature of the oil is increased and where the temperature of the oil is decreased after it is increased, the basic characteristics of the component investigate experimentally.

著者

鈴木 教之

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.65, no.4, pp.347-357, 2007-04-01 (Released:2010-10-20)

参考文献数

92

被引用文献数

10 13

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It is generally known that small cyclic alkynes such as cyclopentyne is extremely reactive and unstable. Therefore it has been believed impossible to isolate cyclopentyne compounds.We recently reported that low-valent group 4 metallocenes reacted with 1, 2, 3-butatrienes to give 1-metallacyclopent-3-yne complexes and that resulted compounds are surprisingly stable and isolable. We succeeded in determination of their molecular structures by X-ray diffraction analyses, and showed that these are five-membered cyclic alkynes, while π, π-interaction of butatriene was also suggested. In this review, the preparation, structure and reactivity of these 1-metallacyclopent-3-yne compounds are described.The 1-zirconacyclopent-3-yne complexes reacted with another 'zirconocene' to form bimetallic complexes in which the cyclic alkyne coordinated to the other zirconocene moiety, indicating that the zirconacyclopentyne behaved as an alkyne. Seven-membered cyclic alkynes were also prepared from 1, 2, 3-butatriene and a zirconocene-alkyne compound. Protonolysis and subsequent nucleophilic attack to aldehyde gave allenyl or dienyl alcohol depending on proton source.