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reaction was carried out in refluxing methanol, transesterification of the ethyl ester into the methyl ester occurred ( Scheme 3 ). Scheme 3: Formation of dimethyl 2-phenylpyridine-3,6-dicarboxlate ( 3 ) and methyl 3-amino-3-phenylacrylate ( 4 ) upon reacting 2a with ammonium acetate in boiling methanol. 3 Conclusion In conclusion, the thermal metal-free [2+2] cycloadditions of electron-poor acetylenes to some polysubstituted systems with conjugated double bonds (polysubstituted butadienes) are described. The structures of the products were determined either by single

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-0020 Z. Naturforsch. 2018; 73(7)b: 481–491 a b Dörthe Jakobi, André Schumann and Rainer Beckert Integrating the fluorene substructure into azaacenes: syntheses of novel fluorophores https://doi.org/10.1515/znb-2018-0023 Z. Naturforsch. 2018; 73(7)b: 493–500 Z. Naturforsch.   2018 | Volume 73 | Issue 7(b) Benjamin Prek, Marta Počkaj, Willi Kantlehner and Branko Stanovnik Thermal metal-free [2+2] cycloaddition of acetylenedicarboxylates to poly- substituted butadienes https://doi.org/10.1515/znb-2018-0052 Z. Naturforsch. 2018; 73(7)b: 501–513 Maren Muntzeck and

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, Jan C. Namyslo and Andreas Schmidt Chemistry and spectroscopy of cross-conjugated and pseudo-cross-conjugated quinolinium-ethynyl-benzoate mesomeric betaines 481 Dörthe Jakobi, André Schumann and Rainer Beckert Integrating the fluorene substructure into azaacenes: syntheses of novel fluorophores 493 Benjamin Prek, Marta Počkaj, Willi Kantlehner and Branko Stanovnik Thermal metal-free [2+2] cycloaddition of acetylenedicarboxylates to polysubstituted butadienes 501 Maren Muntzeck and René Wilhelm Protic ionic liquids as catalysts for a three