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Ahmed H. M. Elwahy

Bio: Ahmed H. M. Elwahy is an academic researcher from Cairo University. The author has contributed to research in topics: Chemistry & Pyridine. The author has an hindex of 25, co-authored 180 publications receiving 1816 citations. Previous affiliations of Ahmed H. M. Elwahy include Helwan University & Technische Universität Darmstadt.
Topics: Chemistry, Pyridine, Pyrazole, Dimedone, Amide

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TL;DR: The main strategies for the synthesis of fused heterocycles by metal-mediated cyclotrimerization of alkynes and/or nitriles as well as their specific syntheses are reviewed in this article.

118 citations

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TL;DR: The difference between the obtained chitosans from three insect sources and α-chitosan from shrimp in terms of crystallinity, fibrous structure was discussed.

112 citations

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TL;DR: In this article, the macrocyclic diamides were obtained by nucleophilic reaction of bis phenols with the appropriate dihalo compounds 2, 3, 40 and 41, respectively.

58 citations

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TL;DR: The macrocyclic Schiff bases were prepared by cyclocondensation of bis aldehydes 12-15 with the appropriate diaminoalkanes 17, 19 and reduction of the latter with NaBH 4 afforded the corresponding azacrown ethers 27, 30, 31 and 1,ω-bis[quinoxalino(2,3 b )benzoxazepino-13-on-yl]alkanes 60, 61, respectively as discussed by the authors.

55 citations

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TL;DR: An efficient route for the synthesis of novel bis(1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile) derivatives is reported and indicated the best binding mode compared to the standard ligand sorafenib.

53 citations

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TL;DR: Transition-Metal-Free Reactions, Alkynylation of Heterocycles, and Synthesis of Electronic and Electrooptical Molecules: A Review.
Abstract: 3.7. Palladium Nanoparticles as Catalysts 888 3.8. Other Transition-Metal Complexes 888 3.9. Transition-Metal-Free Reactions 889 4. Applications 889 4.1. Alkynylation of Arenes 889 4.2. Alkynylation of Heterocycles 891 4.3. Synthesis of Enynes and Enediynes 894 4.4. Synthesis of Ynones 896 4.5. Synthesis of Carbocyclic Systems 897 4.6. Synthesis of Heterocyclic Systems 898 4.7. Synthesis of Natural Products 903 4.8. Synthesis of Electronic and Electrooptical Molecules 906

2,522 citations

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TL;DR: The aim of this Review is to describe the crucial interaction mechanisms in context, and thus classify the entire subject of supramolecular chemistry.
Abstract: Supramolecular chemistry has expanded dramatically in recent years both in terms of potential applications and in its relevance to analogous biological systems. The formation and function of supramolecular complexes occur through a multiplicity of often difficult to differentiate noncovalent forces. The aim of this Review is to describe the crucial interaction mechanisms in context, and thus classify the entire subject. In most cases, organic host-guest complexes have been selected as examples, but biologically relevant problems are also considered. An understanding and quantification of intermolecular interactions is of importance both for the rational planning of new supramolecular systems, including intelligent materials, as well as for developing new biologically active agents.

968 citations

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TL;DR: In this paper, a review deals with some recent advances relating to [2 + 2+2+2] cycloaddition reactions involving the syntheses both of polycycles and of heterocycles.

420 citations