1,721,121 research outputs found
Basic Alumina Catalysed Synthesis of Substituted 2-Amino-2-chromenes via Three-component Reaction
No full textOne-pot diastereoselective synthesis of 2-acyl-4-nitrocyclohexanol derivatives in aqueous medium
No full textMOLECULAR REQUIREMENTS OF THE ACTIVE SITESOF THE CHOLINERGIC RECEPTORSXI - Synthesis and biological evaluation of isomuscarine and itsisomers
No full textThe synthesis of isomuscarine (lI c) and ol its threeisomers is described. Their structure were establisked on the basis olN.M.R. and I.R. data.unlike the dioxolane (l), lrom which they are lormally derived bysubstituting the oxygen in position 3 by a CHOH group, the isomuscarinesare completely devoid of cholinergic activity. This result is explained bythe impossibility ol the corresponding receptor site of accepting a grouplarger than the ether oxygen. Interactions ol the onium and C-7 methylgroups are assumed to be the driving lorces for binding with the muscarinicreceptor while a dipole-dipole interaction for oxygenated functions is propose
Envirocat EPGZ as a New Heterogeneous Catalyst for the Regeneration of Ketones from Their Tosylhydrazones
No full textSolvent Free Tetrahydropyranylation of Phenols and Alcohols over Zeolite HSZ as Reusable Catalysts
No full textAcid Alumina as Useful Solid Heterogeneous Catalyst in the Michael Reaction of B-Dicarbonyl Derivatives with Conjugated Nitroalkenes
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
Thioacetacetalization of Carbonyl Compounds by Zeolite HSZ-360 as a New, Effective Heterogeneous Catalyst
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