1,721,003 research outputs found
Anti-1,4,5,8-tetrahydro-1,4-5,8-dimethanonaphthalene (sesquinorbornadiene), A Molecule With 3 Parallel, Coplanar, and Interacting Double-bonds
No full textAnti-1,4,5,8-Tetrahydro-1,4;5,8-dimethanonaphthalene (sesquinorbornadiene)(1), a molecule possessing six electrons distributed in three parallel double bonds set in one plane and within an interacting through-space distance, has been synthesized
Different Approaching Directions of ς and ϖ Nucleophiles to the Sulfur Atom of Thiiranium and Thiirenium Ions.
No full textX-ray Structures and Anionotropic Rearrangenents of Di-tert-butyl Substituted Thiiranium and Thiirenium Ions. A Structure-Reactivity Relationship
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ESR spectroscopy as a tool to investigate the properties of self-assembled monolayers protecting metal nanoparticles
No full text(Z)— and (E)—1,2—Bis(phenylsulfonyl)ethylenes as Synthetic Equivalents to Acetylene as Dienophiles
No full textA new method for introducing an ethylenic bridge via a cycloaddition reaction has been developed. It makes use of either (Z)- or (E)-1,2-bis(phenylsulfonyl)ethylene (5 or 6) as synthetic equivalents of acetylene. The high activation due to the two sulfonyl groups promotes cycloadditioti even to very unreactive dienes. The removal of the two sulfonyl groups for the required formation of the carbon-carbon double bond is promoted by reduction with metal amalgams in high yields. These properties, associated with the stability of the reagents and the ease of performance of the reactions, make this method a very useful synthetic tool for the preparation of polycyclic dienes and a valid alternative to the commonly available reagents that largely depend upon oxidative methods. © 1984, American Chemical Society. All rights reserved
Nucleophilic Reactions at the Sulfur of Thiiranium and Thiirenium Ions. New Insight in the Electrophilic Additions to Alkenes and Alkynes. Evidence for an Episulfurane Intermediate.
No full textGoing 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
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