1,721,106 research outputs found
Treatment of N-alkyl-N'-tosylhydrazines with oxidizing agents: a new route to alkanesulphinic esters
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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
Regiospecific oxidation of disulfides to sulfoxides catalized by Gold(III) chloride in phase transfer conditions
No full textOssidazione di alchini, alchil aril solfuri e diaril solfuri con acido nitrico catalizzata da tetrabutilammonio tetrabromo- e tetracloroaurato in condizioni di trasferimento di fase
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Dynamic HPLC on chiral stationary phases: a powerful tool for the investigation of stereomutation processes
Full text linkDynamic HPLC on enantioselective stationary phases has become a well-established technique to investigate chiral molecules with internal motions that result in stereoinversion and occur on the time scale of the separation process. Kinetic parameters
for the on-column interconversion phenomena can be extracted from experimental peak profiles by computer simulation or by direct calculation methods. The technique has been used in a wide range of temperatures and is complementary in scope to dynamic NMR spectroscopy
Direct HPLC separation of beta-aminoester enantiomers on totally synthetic chiral stationary phases
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