1,721,114 research outputs found
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
Regiochemistry of propene insertion with group 4 polymerization catalysts from a theoretical perspective
No full textThe regiochemistry of monomer insertion in propene polymerization promoted by group 4 metal catalysts has been investigated by using DFT methods. Our study supports the concept that for metallocene-based catalysts the regiochemistry of propene is mainly originated by steric effects. Instead, for octahedral systems a delicate balance between steric and electronic effects is found. This allows to play with the electronic properties of the ligand framework to tune finely the regiochemistry of polymerization
Molecular Modeling of the Regiochemistry of Olefins Insertion with Single Site Polymerization Catalysts
No full textThe regiochemistry of propene insertion promoted by metallocene and postmetallocene Column 4 metal catalysts is investigated with quantum mechanics techniques. It is shown that steric effects dominate the regiochemistry of monomer insertion with classical metallocene-based catalysts, whereas both electronic and steric effects contribute to the regiochemistry of propene insertion with postmetallocene catalysts
The Elusive Mechanism of Olefin Metathesis Promoted by (NHC)Ru-Based Catalysts: A Trade between Steric, Electronic, and Solvent Effects
No full textMolecular Modeling of the Regiochemistry of Olefins Insertion with Single Site Polymerization Catalysts
No full text
Regiochemistry of 1-alkene insertion with metallocene and post-metallocene polymerization catalysts.
No full textAbstracts of Papers, INOR-657
Regiochemistry of 1-alkene insertion with metallocene and post-metallocene polymerization catalysts.
No full textAbstracts of Papers, INOR-657
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