1,721,076 research outputs found
Processi catalitici selettivi. Ricerca ed applicazione nella sintesi di "fine chemicals"
No full textSynthesis of N,N'-dibenzylethylenediamine via palladium-carbon-catalysed reductive alkylation
No full textReductive alkylation of ethylenediamine with benzaldehyde and hydrogen in the presence of Pd-C has been investigated in order to optimize the synthesis of N,N'-dibenzylethylenediamine; the efficiency of the procedure has been improved by minimizing undesired competing reactions of cyclization and hydrogenolysis
Fattori che influenzano l’idrogenazione enantioselettiva di acidi ,-insaturi in catalisi eterogenea
No full textEnatioselective hydrogenation of alfa, beta-unsaturated acids on supported Pd or Pt catalysts
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One-pot gas phase synthesis of 1,2-Methylenedioxybenzene
No full textA careful investigation of the one-pot gas phase synthesis of 1,2-methylenedioxybenzene (MDB) without using halogenated reagents, was carried out by reacting pyrocatechol (PYC) with formaldehyde acetals on Ti-silicalite and other Ti-supported catalysts
Vapour Phase Synthesis of 1,3-Benzodioxole
No full textIn this atudy we reported a careful investigation on one-pot vapor phase synthesis of 1,3-Benzodioxole by reaction of Pyrocathecol with formaldehyde or its derivatives. The catalytic tests were performed in vapor phase using at first a Ti-silicalite and then ZrO2 based catalyst
Nuovo procedimento per la preparazione di derivati del glicerolo otticamente attivi
No full textMetodo per preparare un composto otticamente attivo di formula HO-CH2-C*HOR4-CH2OR5 (I) ed intermedi di formula HOOC-CRR2-CR1R3-CO-O-CH2-C*HOR4-CH2OR5 (II) dove R, R1, R2, R3, R4 ed R5 hanno i significati indicati nella descrizione
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
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