1,721,064 research outputs found
JOHN O. EDWARDS: MEZZO SECOLO DI CHIMICA DEI COMPOSTI PEROSSIDICI
No full textÈ presentata una breve rassegna circa la figura e l’opera scientifica del prof. John O. Edwards
(Brown University, USA), socio onorario della Società Chimica Italiana, di recente scomparso.
Il suo notevole contributo allo sviluppo delle conoscenze nel campo delle chimica dei composti
perossidici, con particolare riguardo alla definizione dei meccanismi di ossidazione, è qui riassunto
traendo lo spunto dai suoi studi sul trasferimento di ossigeno elettrofilo da perossidi a substrati
nucleofili, sulla generazione di specie radicaliche, sulla catalisi da complessi di metalli di transizione
e sulla definizione della reattività dell’elusivo acido perossonitroso
“Facile Conversion of Sulfilimines into Sulfoximines Using Dioxiranes”
No full textEmploying dimethyldioxirane, the direct conversion of several N-(p-tolylsulfonyl)sulfilimines and of one N-(acetyl)sulfilimine into the corresponding sulfoximines was achieved in high yield under mild conditions. Optically active S-(p-tolyl)-S-methyl-N-(p-tolylsulfonyl)sulfilimine could be transformed into its sulfoximine in high enantiomeric excess with retention of configuration. The effect of substituents indicates that the oxidation involves electrophilic O-transfer from the dioxirane to the sulfilimine sulfur
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
Oxofunctionalization of Non-natural Targets by Dioxiranes. Efficient Oxidation of Buckminsterfullerene C60 with Methyl(trifluoromethyl)dioxirane
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