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6,705 Newest Publications about the topic esters

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Macromolecular design with the use of acrylic monomers containing groups with mobile hydrogen atoms

30-Nov-2007 | B. A. Rozenberg, Polymer Science Series C, 2007

The review covers the experimental and theoretical studies devoted to the anionic polymerization of esters and amides of acrylic and methacrylic acids containing groups with mobile hydrogen atoms. Within the framework of ideas concerning the kinetics and mechanism of the processes of interest and ...

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Regioselectivity of the Michael Addition of Nitromethane on a,ß-Unsaturated Acid Esters

19-Feb-2004 | Lubomír Floch, Juraj Kubán, Andrea Gogová, Peter Zálupsky, Tibor Jakubík, Nada Prónayová, Molecules Online, 2004

Triton B catalyzed Michael addition of nitromethane on esters of !,#-unsaturated acids 1 has been studied. The course and regioselectivity of the reaction is discussed in the view of structure of products 2a-g, 3a-g, 4g, f, 5g, f, assessed by GC/MS, NMR and IR spectroscopy and by MOPAC ...

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Synthesis of New Pyrano[2,3-d]Pyrazoles and Furochromones Derivatives Utilizing Amino Acids Derivatives

19-Feb-2004 | N.M. Fawzy, A.M. Shalaby, M.E.A. Zaki, Molecules Online, 2004

. Hydrolysis of oxazolone derivatives (2b) yielded a-khellinoyl(amino)-cinnamic acid (3) as a good precursor to react with ethyl esters of glycine, l-methionine, and glycylglycine affording 4, 5, and 4,5 respectively with minor product 7. Hydrolysis of oxazolone derivatives (2b) afforded ...

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Asymmetric Synthesis of 3-Substituted 4-Oxoesters Using the SAMP-/RAMP-Hydrazone Method

19-Feb-2004 | D. Enders, U. Baus, P. Müller, K.C. Nicolaou, B. Jandeleit, Molecules Online, 2004

. Based on aldehydes 1a-f or ketone 1g, 3-substituted 4-oxo esters 6a-g were synthesized in three steps in moderate to good overall yield (12-50%) and in excellent enantiomeric excesses (ee > 90® 95%) by an Umpolung-strategy employing the SAMP-/RAMP-hydrazone method. The key step in the ...

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Some Cyclisations of N-(o-Nitrophenyl)amino Acid Esters

19-Feb-2004 | Colin S. French, David M. Smith, Molecules Online, 2004

The N-(o-nitrophenyl) derivatives of glycine and sarcosine esters 1a and 1b are cyclised in basic media to benzimidazole N-oxides 2 and 1-hydroxyquinoxaline-2,3-diones 3 respectively. Since the formation of the hydroxyquinoxalinedione is anomalous given the previously accepted mechanism for ...

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