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طريقة مباشرة و انتقائية لتحضير مركبات 2ـ بروموـ 4ـ الكيل ـ ثيوفينات: باساليب ملائمة لتحضير ثنائي هيكل ـ202 ـ ثنائي ثيوفينات كرأس ـ ذيل وذيل ـذيل. UMIS

Ashraf Abd El Hameed El Shahawi

"Reaction of 2-thiohydantoins with some diazoalkanes and some amines" A. A. El-Barbary, Y. L. Aly, A. M. Hashem and A. A. El-Shehawy UMIS

Ashraf Abd El Hameed El Shahawi

"Alkylation of thiohydantoins including synthesis, conformational and configurational studies of some acetylated S-pyranosides" Y. L. Aly, A. A. El-Barbary and A. A. El-Shehawy UMIS

Ashraf Abd El Hameed El Shahawi

. "Enantioselective synthesis of homoallylamines by nucleophilic addition of chirally modified allylboron reagents to imines" S. Itsuno, K. Watanabe, K. Ito, A. A. El-Shehawy and A. A. Sarhan UMIS

Ashraf Abd El Hameed El Shahawi

. "Enantioselective allylation of N-(trimethylsilyl)benzaldehyde imine using polymer-supported chiral allylboron reagents" A. A. El-Shehawy, M. Y. Abdelaal, K. Watanabe, K. Ito and S. Itsuno UMIS

Ashraf Abd El Hameed El Shahawi

. "Preparation of both diastereomers of homoallylic amines by allylmetalation of methyl N-benzylidene-(S)-valinate" A. A. El-Shehawy, M. A. Omara, K. Ito and S. Itsuno UMIS

Ashraf Abd El Hameed El Shahawi

"Enantioselective synthesis of optically active homoallylamines by nucleophilic addition of chirally modified allylboranes to N-silylimines" S. Itsuno, K. Watanabe, T. Matsumoto, S. Kuroda, A. Yokoi and A. El-Shehawy UMIS

Ashraf Abd El Hameed El Shahawi

. "Synthesis of novel chiral monomers by means of Umani-Ronchi-Savoia allylation and their polymerization" S. Itsuno and A. A. El-Shehawy UMIS

Ashraf Abd El Hameed El Shahawi

"Enantioselective synthesis of chiral homoallyl alcohols and homoallylamines by nucleophilic addition of an allylboron reagent modified by a polymer-supported chiral ligand" S. Itsuno, K. Watanabe and A. A. El-Shehawy UMIS

Ashraf Abd El Hameed El Shahawi

11. "Phase transfer catalyzed reactions of crosslinked chloromethylated polystyrene with vanillin" A. A. Sarhan, A. A. El-Shehawy and M. Y. Abdelaal Reactive & Functional UMIS

Ashraf Abd El Hameed El Shahawi

. "Michael addition of activated nitriles to 4[(+)-camphor-10'-sulfonylamino]-acetophenone and some of its chalcones" A. A. El-Shehawy and A. M. E. Attia UMIS

Ashraf Abd El Hameed El Shahawi

. "Allylation of aldiminomercaptotriazinones using allyl halides and allylmetal compounds" A. A. El-Shehawy " UMIS

Ashraf Abd El Hameed El Shahawi

14. "Allylation of some arylideneaminomercaptotriazinones using polymer-supported allylboron reagents and analogous allylboration reaction of imine-supported resin" A. A. El-Shehawy UMIS

Ashraf Abd El Hameed El Shahawi

15. "Synthesis of novel bicycloalkane ring-fused pyridines via Michael addition reaction of -unsaturated nitriles" A. A. El-Shehawy, A. A. Ismail and A. M. Attia UMIS

Ashraf Abd El Hameed El Shahawi

16. "A convenient method for the synthesis of 2-(-D-glycopyranosylthio) pyridines" A. M. E. Attia and A. A. El-Shehawy UMIS

Ashraf Abd El Hameed El Shahawi

17. "Synthesis of N1- and N3-quinazolin-3(H)-4-thione non-nucleosides" A. A. Ismail, A. A. El-Shehawy and A. M. Attia UMIS

Ashraf Abd El Hameed El Shahawi

18. "Precise synthesis and surface characterization of well-defined chain-end-functionalized polystyrenes with two, four, eight, sixteen and thirty-two perfluorooctyl groups" K. Sugiyama, S. Sakai, A. El-Shehawy and A. Hirao UMIS

Ashraf Abd El Hameed El Shahawi

19. ""Precise synthesis of novel chain-end-functionalized polystyrenes with a definite number of perfluorooctyl groups and their surface characterization" Ashraf A. El-Shehawy, Hideaki Yokoyama, Kenji Sugiyama, and Akira Hirao UMIS

Ashraf Abd El Hameed El Shahawi

20. "Enantioselective diethylzinc addition to the exocyclic C=N double bond of some 4-arylideneamino-3-mercapto-6-methyl-4H-1,2,4-triazin-5-one derivatives" Ashraf A. El-Shehawy 20. "Enantioselective diethylzinc addition to the exocycl UMIS

Ashraf Abd El Hameed El Shahawi

21. "Efficient dual catalytic enantioselective diethylzinc addition to the exocyclic C=N double bond of some 1,2,4-N-triazinylarylimines using polymer-supported chiral -amino alcohols derived from norephedrine" Ashraf A. El-Shehawy UMIS

Ashraf Abd El Hameed El Shahawi

22. "Synthesis of novel well-defined chain-end-functionalized polystyrenes with dendritic chiral ephedrine moieties and their applications as highly enantioselective diethylzinc addition to N-diphenylphosphinoyl arylimines" Ashraf A. El-Sh UMIS

Ashraf Abd El Hameed El Shahawi

. "Application of well-defined chain-end-functionalized polystyrenes with dendritic chiral ephedrine moieties as highly catalytic enantioselective addition of dialkylzinc reagents to aldehydes" Ashraf A. El-Shehawy, Kenji Sugiyama and Akir UMIS

Ashraf Abd El Hameed El Shahawi

"Convenient approaches for the synthesis and characterization of well-defined linear-dendritic diblock copolymers having a definite number of peripheral primary amino groups: Exact control of numbers introduced and dendritic distribution to UMIS

Ashraf Abd El Hameed El Shahawi

. "A selective and direct synthesis of 2-bromo-4-alkylthiophenes: Convenient and straightforward approaches for the synthesis of head-to-tail (HT) and tail-to-tail (TT) dihexyl-2,2`-bithiophenes" Ashraf A. El-Shehawy, Nabiha I. Abdo, Ahmed UMIS

Ashraf Abd El Hameed El Shahawi

. "Alternating copolymers based on 2,1,3-benzothiadiazole and hexylthiophene: positioning effect of hexyl chains on the photophysical and electrochemical properties" Ashraf A. El-Shehawy, Nabiha I. Abdo, Ahmed A. El-Barbary, Jae Suk Lee UMIS

Ashraf Abd El Hameed El Shahawi

. "5-Anthracenylidene- and 5-(4-benzyloxy-3-methoxy)benzylidene-hydantoin, 2-thio-hydantoin derivatives, synthesis and S-alkylation" Youssef L. Aly, Ashraf A. El-Shehawy, Adel M. Attia and Mohmed E. Sobh UMIS

Ashraf Abd El Hameed El Shahawi

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