1,721,071 research outputs found
Dataset to support the article "Anion-π Catalysis Enabled by the Mechanical Bond"
No full textCharacterisation data for reported compounds to support article in Angewandte Chemie International Edition. DOI 10.1002/anie.202115961</span
Synthesis and applications of functional interlocked molecules: anion-π catalysis and mechanically chiral structures
No full textMechanically interlocked molecules (MIMs) have progressed from synthetic curios to readily accessible structures due to the development of high yielding “templated” syntheses. MIMs are able to display molecular chirality in the absence of traditional covalent stereogenic units, and recent studies have begun to investigate effective synthetic approaches to these “mechanically chiral” molecules that avoid chiral stationary phase HPLC separations of products, allowing their potential applications in catalysis, sensing and materials applications to be assessed without the prohibitive cost and scale limitations associated with CSP-HPLC. This thesis describes work to expand the applications of MIMs prepared via an active template approach. In the first chapter, the progress made in the synthesis of mechanically chiral molecules is summarised. In the second, a study on the functional group tolerance of a Ni-mediated macrocyclisation reaction is described. In the third, the application of rotaxanes as anion-π catalysts is explored. Finally, in the fourth chapter, a stereoselective synthesis of mechanically axially chiral catenanes is developed
Strategies for the synthesis of enantiopure mechanically chiral molecules
No full textMechanically interlocked molecules, such as rotaxanes and catenanes, are composed of two or more covalent subcomponents threaded through one another such that they cannot be separated without breaking a covalent bond. This arrangement can allow the covalent subcomponents to undergo large amplitude relative motion, and this property of the mechanical bond has been widely exploited in the design and synthesis of molecular machines. Another less well-known property of the mechanical bond is that it can give rise to chirotopic stereogenic units that do not rely on covalent stereogenic elements. Although the study of such "mechanically chiral" molecules is expanding, their synthesis in enantiopure form remains challenging. In this perspective we review the strategies available, highlighting key examples along the way, and suggest future areas for development
Fight for liberty and freedom the origins of Australian Aboriginal activism
No full textThe Australian Aboriginal Progressive Association (AAPA), begun in 1924, is little heard of today, but today's Aboriginal political movement is drawn from these roots. In this passionate exploration of the life of founder, Fred Maynard, John Maynard reveals the commitment and sacrifices made by these Aboriginal heroes. Decades earlier than is commonly understood, Aboriginal people organised street rallies and held well-publicised regional and metropolitan meetings. The AAPA showed incredible aptitude in using newspaper coverage, letter writing and petitions, and collaborated with the international black movement through Maynard's connections with Marcus Garvey, first president of the Universal Negro Improvement Association (UNIA). The AAPA's demands resonate today: Aboriginal rights to land, preventing Aboriginal children being taken from their families, and defending a distinct Aboriginal cultural identity
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
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