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Facile Synthetic Route (facile + synthetic_route)
Selected AbstractsA Facile Synthetic Route to 2H-Chromenes: Reconsideration of the Mechanism of the DBU-Catalyzed Reaction Between Salicylic Aldehydes and Ethyl 2-Methylbuta-2,3-dienoate.CHEMINFORM, Issue 35 2007Lun-Zhi Dai Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] A Novel Facile Synthetic Route to Highly Substituted 2,3-Dihydrofurans via Ammonium Ylides.CHEMINFORM, Issue 52 2005Zhanjun Yang Abstract For Abstract see ChemInform Abstract in Full Text. [source] A Facile Synthetic Route to 2,H -Chromenes: Reconsideration of the Mechanism of the DBU-Catalyzed Reaction between Salicylic Aldehydes and Ethyl 2-Methylbuta-2,3-dienoate,CHEMISTRY - A EUROPEAN JOURNAL, Issue 13 2007Lun-Zhi Dai Abstract Reactions of salicylaldehydes with ethyl buta-2,3-dienoate or penta-3,4-dien-2-one catalyzed by a catalytic amount of potassium carbonate produce the corresponding 2,H -chromene products in moderate to good yields under mild conditions. A plausible reaction mechanism is discussed in the light of the results of an 18O-labeling experiment. In addition, in view of these findings, the catalytic function of DBU in reactions of this kind is reconsidered. [source] Facile synthetic route to polymerizable hindered amine light stabilizers for transition-metal-catalyzed olefin copolymerizationJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 6 2004M. Auer Abstract This work describes a facile method by which a polymerizable hindered amine light stabilizer, 4-(10-undecylidene)-2,2,6,6-tetramethylpiperidine, was prepared in a single-step procedure by means of a Wittig reaction. The monomer was successfully copolymerized with ethylene with a rac -[dimethylsilylenebis(4,5,6,7-tetrahydro-1-indenyl)]zirconium dichloride/methylalumoxane catalyst system. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 1350,1355, 2004 [source] Atom Transfer Radical Polymerization of Glycidyl Methacrylate: A Functional MonomerMACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 16 2004Pedro Francisco Cañamero Abstract Summary: A detailed investigation of the polymerization of glycidyl methacrylate (GMA), an epoxy-functional monomer, by atom transfer radical polymerization (ATRP) was performed. Homopolymers were prepared at relatively low temperatures using ethyl 2-bromoisobutyrate (EBrIB) as the initiator and copper halide (CuX) with N,N,N,,N,,N,-pentamethyldiethylenetriamine (PMDETA) as the catalyst system. The high polymerization rate in the bulk did not permit polymerization control. However, homopolymerization in solution enabled us to explore the effects of different experimental parameters, such as temperature, solvent (toluene vs. diphenyl ether) and initiator concentration, on the controllability of the ATRP process. SEC analysis of the homopolymers synthesized confirmed the importance of solvent character on molecular weight control, the lowest polydispersity indices () and the highest efficiencies being found when the polymerizations were performed in diphenyl ether in combination with a mixed halide technique. A novel poly(glycidyl methacrylate)- block -poly(butyl acrylate) (PGMA- b -PBA) diblock copolymer was prepared through ATRP using PGMA-Cl as a macro-initiator. This chain growth experiment demonstrated a good living character under the conditions employed, while simultaneously indicating a facile synthetic route for this type of functional block copolymer. In addition, the isotacticity parameter for the PGMAs obtained was estimated using 1H NMR analysis which gave a value of ,GMA,=,0.26 in agreement with that estimated in conventional radical polymerization. SEC chromatograms of PGMA-Cl macroinitiator and PGMA- b -PBA diblock copolymer. [source] Synthesis of Amino-Bridged Oligosaccharide MimeticsEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 5 2010Janna Neumann Abstract Synthesis of amino-bridged oligosaccharides using reductive amination opens rapid access to novel glycomimetic target structures as potential ligands for the receptor protein NKR P1 of natural killer cells. Emphasis was laid on fast and facile synthetic routes. The carbonyl building blocks were easily obtained by oxidation with Dess,Martin periodinane or iodoxybenzoic acid (IBX). For the required amino-functionalized units, reduction of azide precursors was advantageous, and generation of the novel oligosaccharides was achieved by subsequent reductive amination. The target saccharide structures feature a bridging nitrogen atom inserted between two non-anomeric positions as well as including one anomeric position. [source] | |||||||||||||