1,720,954 research outputs found

    The synthesis of the fully conjugated of extended bimetal-porphyrin and application

    No full text
    本篇論文主要是利用微波技術合成出雙酮紫質化合物A5,比傳統上的方法來的更快速得到產物。但化合物A5在共溶劑下 (H2O, Et2O, CH2Cl2, MeOH)加入5,6-diamino-1,l0-phenanthroline卻會使得原本鄰位的雙酮官能基轉換成對位的雙酮化合物A9。A9在二甲基甲醯胺為溶劑下和氯化鈷進行螯合作用,雙酮紫質錯合物C1。此鈷金屬紫質錯合物應用在雙鍵的氧化上有不錯的效果,如反-二苯乙烯的氧化反應,可得到100%產率的跨苯乙烯氧化物。對於芳香醛類和硫醚的氧化反應則是以NHPI當自由基起始劑,利用氧氣當氧化劑來氧化反應物。不但符合綠色化學的觀念,而且反應的條件相當溫和,對於有機合成或是生化的應用上有很大幫助。To synthesize a conjugation system of porphyrins and to study their properties with metal ions are the major work of this thesis. With the assists of microwave technology, the target molecule was easily achieved. In the presence of the diketone porphyrin with 5,6-diamino-1,l0-phenanthroline in a co-solvent system (CH2Cl2:Et2O: MeOH:H2O) proceeded smoothly to yield the p-diketoone prophyrin (A9). Complexation of A9 with various metal ions were investigated. In a typical example, reaction of CoCl2 with A9 in the DMF, produced a metal-prophyrin species C1. This cobalt prophyrin complex can be used as a catalyst in oxidation olefin, benzaldehydes and sulfides under mild conditions.目錄 I 附圖目錄 III 附表目錄 IV 論文摘要 (中文) V 論文摘要 (英文) VI 第一章 緒論 1 第1-1節 紫質的簡介 1 第1-2節 紫質應用在醇類和醛類的氧化反應 1 第1-3節 飽和碳氫鍵或雙鍵的氧化反應 5 第1-4節 硫醚的氧化反應 6 第1-5節 雙金屬紫質探討 7 第1-6節 實驗動機 8 第二章 雙酮共軛紫質錯合物的合成與鑑定 10 第2-1節 雙酮紫質的合成 10 第2-2節 雙胺配位基的合成 12 第2-3節 延伸共軛紫的雛型研究 13 第2-4節 雙酮共軛紫質錯合物的合成與鑑定 17 第三章 氧化反應的結果與討論 25 第3-1節 醛類的氧化反應 25 第3-2節 烯類的環氧化反應 30 第3-3節 硫醚的氧化反應 34 第3-4節 不同紫質催化劑對於氧化反應上的研究 39 第四章 結論 42 第五章 實驗部分 43 第5-1節 一般實驗方法 43 第5-2節 反應試劑與溶劑的前處理 44 第5-3節 合成雙酮紫質 44 第5-4節 雙胺配位基的合成 48 第5-5節 共軛紫質化合物的合成 49 第5-6節 合成硫醚反應物 56 第5-7節 氧化反應 57 參考文獻 63 附錄 67 附圖目錄 圖1化合物A5和S1化合物氫核共振光譜圖比較 14 圖2 化合物S2在CDCl3下測得的氫核共振光譜圖 15 圖3化合物S2在d-acetone下測得的氫核共振光譜圖 16 圖4化合物A9氫核共振光譜圖 17 圖5化合物A9的QC光譜圖 18 圖6 化合物A10氫核共振光譜圖 21 圖7錯合物C1之單晶繞射圖 22 圖8化合物C2的氫核共振光譜圖 23 圖9化合物C2的QC光譜圖 24 附表目錄 Table 1-1 TON of Mn(TPP)OAc in the oxidation 3 of different alcohols using Bu4NHSO5 Table 1-2 Encapsulated MPs catalyzed oxidation of 4 1-phenylethanol by O2 in DCE Table 2-1 化合物A5和不同雙胺化合物或鹼反應 19 Table 3-1 雙酮紫質化合物C1對4-甲基苯甲醛的氧化反應 27 Table 3-2 化合物C1氧化不同取代基的芳香環醛類 29 Table 3-3 輔助基影響催化反應的探討 30 Table 3-4 烯類的氧化反應 33 Table 3-5 化合物C1和不同氧化劑對於thioanisole的氧化反應 36 Table 3-6 NHPI系統中不同取代基的硫醚和光強弱的探討 38 Table 3-7 不同紫質化合物對trans-stilbene環氧化的反應 39 Table 3-8 不同紫質化合物對4-methoxybenzaldehyde的氧化反應探討 40 Table 3-9 不同紫質錯合物對於硫醚的氧化反應 4

    Going Beyond Counting First Authors in Author Co-citation Analysis

    Get PDF
    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed

    Variations on the Author

    Get PDF
    “Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship

    Appropriate Similarity Measures for Author Cocitation Analysis

    Get PDF
    We provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis

    Dispelling the Myths Behind First-author Citation Counts

    Get PDF
    We conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more sophisticated methods

    Author Index

    No full text
    Nao informado

    koamabayili/VECTRON-author-checklist: VECTRON author checklist

    No full text
    We have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
    corecore