استاذ - عميد الكلية

كلية العلوم

العنوان: كلية العلوم -جامعة سوهاج



هذا الموقع خاص بالاستاذ الدكتور / أحمد محمد محمد سليمان استاذ الكيمياء العضوية وعميد كلية العلوم

2018-09-20 10:54:36 | الكلمات المفتاحية β-cyclodextrin polymer,
Epichlorohydrin cross-linked β-cyclodextrin polymer a promising method in industry for the synthesis of 2-phenylbenzthiazole in water
in the present study, we report an environmentally benign synthesis of 2-arylbenzothiazoles derivatives from _o_-aminothiophenol and aldehydes in aqueous medium using _β_-cyclodextrin polymer as a catalyst and air as an oxidant. The polymer showed excellent catalytic activity, recovered, reused six times, and the catalyst efficiency remained unchanged. This suggests that the catalyst is an efficient and green catalyst for the ... إقراء المزيد

2018-09-20 10:57:09 | الكلمات المفتاحية Modified Guanidines,
Synthesis of Novel Modified Guanidines: Reaction of Dicyandiamide with Amino Acids, Amides, and Amines in Aqueous Medium
Reaction of dicyandiamide with series of amino acids afforded guanidinyl pyrazolones 2–19, respectively. Although reaction of dicyandiamide with urea, acetamide, bezamide, allantion, p-aminobenzoic acid, sulphanilic acid, and adenine gave biguanides 20–26, respectively. All compounds have been characterized on the basis of IR and 1H-NMR. إقراء المزيد

2018-09-20 11:02:19 | الكلمات المفتاحية and Dihyd, Dihydropyrimidinone,
Synthesis of Pyrimidine, Dihydropyrimidinone, and Dihydroimidazole Derivatives under Free Solvent Conditions and Their Antibacterial Evaluation
The biologically active compounds of pyrimidine, dihydropyrimidinone, and dihydroimidazole have been synthesized in excellent yield under free solvent conditions. The antibacterial evaluation of the products showed a high inhibitory effect. Reaction of 2-guanidinobenzothiazole with several active methylene compounds has revealed formation of the corresponding pyrimidine, dihydropyrimidinone, and dihydroimidazole derivatives under free solvent conditions in very good yield. All compounds have ... إقراء المزيد

2018-09-20 11:05:18 | الكلمات المفتاحية Dihydroimidazole,
Synthesis of Dihydroimidazole Derivatives under Solvent Free Condition and Their Antibacterial Evaluation
Reaction of 2-guanidinobenzoxazole with several halogenated active methylene compounds has revealed formation of the corresponding dihydroimidazole derivatives under solvent free conditions in excellent yield. The anti-bacterial evaluation of the newly synthesized products against different types of Gram-positive and Gramnegative bacteria was performed. Most of products showed high inhibitory effect. The structure of all compounds has been characterized by on IR, ... إقراء المزيد

2018-09-20 11:07:58 | الكلمات المفتاحية Pyrazolopyrimidine,
Synthesis of SomeNovel Imidazopyrazole and PyrazolopyrimidineDerivatives
5-Amino-3-anilino-1H-pyrazole-4-carbonitrile 1 was alkylated with various halo reagents under phase transfer conditions to give the corresponding imidazopyrazole derivatives 2a–c-6. Pyrazolo[1,5-a] pyrimidine derivatives 11–14 were prepared by treating compound 1 with different dicarbonyl reagents, namely, diethymalonate, ethyl 3-oxo-3-phenylpropanoate, pentane-2,4-dione or ethyl 3-oxobutanoate. إقراء المزيد