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organic chemistry

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آلیگ

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Organische Chemie

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The Securinega alkaloids are a class of several secondary metabolites extracted from plants of different genera of the Phyllanthaceae family, including Phyllanthus, Securinega, Flueggea and some others.277 For a long time, some of these plants, especially in Africa and Asia were extensively recommended by local medico as folk medicines. Extraordinarily, various compounds of the class showed antitumor, antimalarial and antibacterial activities.277,278 These compounds contain either azabicyclo[2.2.2]˗ or azabicyclo[3.2.1]octane BC ring frameworks having a fused piperidine or pyrrolidine ring in their complex structure. In 2009, secu’amamine E(307) was initially isolated with combination of two new congeners from Securinega suffruticosa var. amamiensis, constitutes a member of the neosecurinane series by Ohsaki and co-workers.279 Enantiomer (ent˗307) was also isolated as virosine A from Flueggea virosa,280 although this correlation was not disclosed in the subsequent publication (Fig. 48). In 2017, Gademann rese

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Graphitic carbon nitrides (g-C3N4) are becoming increasingly significant due to the theoretical prediction of their unusual properties and promising applications ranging from photocatalysis, heterogeneous catalysis, to fuel cells. Recently, a variety of nanostructured and nanoporous g-C3N4 materials have been developed for a wide range of new applications. This feature article gives, at first, an overview on the synthesis of g-C3N4 nanomaterials with controllable structure and morphology, and secondly, presents and categorizes applications of g-C3N4 as multifunctional metal-free catalysts for environmental protection, energy con and storage. A special emphasis is placed on the potential applications of nanostructured g-C3N4 in the areas of artificial photocatalysis for hydrogen production, oxygen reduction reaction (ORR) for fuel cells, and metal-free heterogeneous catalysis. Finally, this perspective highlights crucial issues that should be addressed in the future in the aforementioned exciting research areas.

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بلنک

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hexane