Department of Chemistry

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Department of Chemistry has more than 56 academic staff members

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Prof.Dr. Abdunnaser Mohamed Shtiwi Etorki

عبدالناصر هو احد اعضاء هيئة التدريس بقسم الكيمياء بكلية العلوم. يعمل السيد عبدالناصر بجامعة طرابلس كـأستاذ مشارك منذ 2013-06-01 وله العديد من المنشورات العلمية في مجال تخصصه

Publications

Some of publications in Department of Chemistry

Synthesis of some Novel 4-Thiazolidinone and Thiophene Derivatives

الهدف الأساسي من هذا المشروع هو تحضير بعض 4-ثيازوليدينونات مستبدلة وتطوير طريقة جديدة لتحضير مشتقات ثيوفين.قمنا بتحضير بعض مشتقات 4-ثيازوليدينونات معروفة وجديدة بتفاعل مركبات ميثيلين نشطة مختلفة (201a-g) مع فينيل أيزوثيوسيانات في دايكوسان في وجود مسحوق جاف من هيدروكسيد البوتاسيوم عند 0-5oC ومعالجة أملاح بوتاسيوم كيتين N، S-- أسيتال الناتجة (202a-g) مع إيثيل كلوروأسيتات ليعطي (203a-g) وقد استخدمت 4-ثيازوليدينونات المحضرة 203a-f)) كمواد بادئة لتفاعلات وتحولات أخرى. حضرت في هذه الدراسة مركبات جديدة (206a-c) بازدواج ملح الديأزونيوم لبارا تولويدين (205) مع 4-ثيازوليدينونات (203a,d,f) ليعطي مشتقات 5-ديازينيل-4- ثيازوليدينونات ((206a-c وقد تفاعلت مشتقات الثيازوليدينون (203a، b، d، f) مع ألدهيدات متنوعة (207a-c) وتم الحصول على مشتقات 5,2 –ثنائي أيليدين (208a-d). لقد جرى سابقا تحويل (203a) بنجاح إلى مشتقات ثيوفين إستر عند تفاعلها مع كحولات وثيوفين أميد عند تفاعلها مع الأمونيا. وكاستمرار لهذا تمت دراسة تفاعلات الكحولات مع 4-ثيازوليدينونات متنوعة لتحويلها إلى مشتقات ثيوفين-2-كربوكسيلات، فقد تفاعل مشتق ثنائي سيانو 4-ثيازوليدينون (203a) بنجاح مع كحول ايزوبيوتيل وأعطى 3-أمينو ثيوفين -2-كربوكسيلات (211a). ولكن هذا الكحول فشل في تحويل بقية 4-ثيازوليدينونات (203b-f). أما المركبين (203d، e) فقد تفاعلا مع الإيثانول بنجاح تحت مكثف راد في وجود ثلاثي إيثيل أمين كحفاز لتعطيا نفس الناتج (211b). وهذا له دلالات كبيرة في تحديد التشكل الهندسي للثيازوليدينون البادئ وميكانيكية التفاعل. ومن جهة أخرى تفاعل مركب (203f) مع الإيثانول تحت مكثف راد ليعطي ثيوفين -4,2-ثنائي كربوكسيلات (211c). كما أدت معالجة مركبات 4-ثيازوليدينونات (203b-c) بالأمونيا إلى تكوين مشتقات ثيوفين كربوكساميد (211a-b) بميكانيكية مشابهة وذات أهمية في تحديد التشكل الهندسي أيضا. ولقد أعطى تفاعل التكثيف لمركب (209a) مع ألدهيدات أروماتية مثل بنزالديهايد وبارا نيتروبنزالديهايد في وجود كبريتات الصوديوم اللامائية مشتقات أزوميثين (218a,b ) . أما ثيينوبيريميدينونات الجديدة (219a-d) فقد تم تحضيرها في هذه الدراسة بتفاعل مركب (209a) مع عدد من الألدهيدات الأروماتية تحت مكثف راد في حمض اسيتيك ثلجي. ومن جهة أخرى تحولق مركب الديازونيوم من (209a) وأعطى مشتقة ثيينو-ترايازينون(221) بدل من الأزيد المتوقع (222) وأخيرا أدى تفاعل 3-أمينوثيوفين-2-كربوكسيليت (210b) مع ثلاتي إيثيل أورثوفورميث إلى تكوين (223). Abstract The main goal of this research project i to synthesize some substituted 4-thiazolidinone and to develop new routes for synthesis of thiophene derivatives. We synthesized some known and novel 4-thiazolidinones by reacting different active methylene compounds (201a-g) with phenylisothio cyanate in dioxane in the presence of dried powder potassium hydroxide at 0-5oC , and treating the resulting ketene-N,S-acetals potassium salts (202a-g) with ethylchloro acetate to give (203a-g). The synthesized 4-thiazolidinones (203a-f) were used as starting materials for further reactions and transformations. In this study novel compounds (206a-c) were prepared by coupling diazonium salt of p-toulidine (205) with 4- thiazolidinone derivatives (203a, d, f), to give 5-diazenyl- 4-thiazolidinone derivatives (206a-c). Thiazolidinone derivatives (203a, b, d, and f) were reacted with a variety of aldehyds (207a-c), to give the corresponding 2, 5-diylidiene derivatives (208a-d). Conversion of 2-ylidene-3-phenyl- 4-thiazolidinones into thiophene-2-carboxylate derivatives was attempted. While compounds (203b-f) did not react with isobutyl alcohol, dicyano derivative (203a) was successfully transformed into 3-aminothiophene carboxylate (211a). Refluxing compounds (203d, e) in ethanol in the presence T.E.A as catalyst gave the same product (211b) .This result is significant in determining the geometry of the starting 4-thiazolidinone and in the mechanism of these transformations. On the other hand, compound (203f) on refluxing with ethanol afforded the thiophene-2, 4-dicarboxylate (211c). Treatment of compounds (203b-c) with ammonia afforded the thiophene carboxamide derivatives (211a-b), involving similar mechanism and significance in geometrical determination of the starting 4-thiazolidinones. The condensation reaction of compound (209a) with aromatic aldehydes in presence sodium sulfate gave the azomethine Schiff base derivatives (218a, b). Some of novel thienopyrimidinone (219a-d) have been synthesized in this work by refluxing compound (209a) with some aromatic aldehyde in glacial acetic acid On the other hand diazonium solution of compound (209a) cyclized into thieno triazinone derivative (221) rather than expected compound (222). The 3-amino thiophene- 2-carboxylate (210b) was refluxed with triethylortho formate to produce compound (223).
نسرين أبو غرارة محمد دويئة (2014)
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Synthesis and Study of Schiff’s Base Ligands Derivedfrom Reaction of Benzil with Aliphatic and Aromaticamines and Their Metal Complexes with Cu(II), Ni(II),Cd(II), Pb(II), Pd(II), Hg(II), and VO2+.

Abstract Five symmetrical Schiff base ligands[four bi-dentate and one tetradentate(L3- L7)] and two un-symmetrical bi-dentate and tri-dentate (L1-L2) ligands with the Nitrogen and oxygen chromophore were isolated inpure form and good yield. The ligands were fully characterized by elemental analyses, melting point, IR, H1- &13C- NMR, and mass spectra.The Schiff bases L1 and L2 were successfully coordinated to Pd(II) and VO2+ ions respectively and these complexes were characterized using elemental analyses, IR and mass spectra. The interesting result by mass spectrum of VO2+ complex of L2 shows parent peak at 524 confirming that the formula of the complex as [VOL2(ac.ac.)2H2O] in which the complex has an octahedral geometry.The symmetrical Schiff bases (L3-L7) were also successfully coordinated to Nickel (II), Copper (II), Lead (II), Cadmium (II), and Mercury (II) ions to form their corresponding complexes. The total twenty five metal (II) XI Schiff base complexes of (L3-L7) were isolated. These complexes were characterized by elemental analyses, melting points, IR, mass spectra technique. 1H &13C-NMR Spectra in DMSO d6 for Pb, Cd, and Hg complexes show the expected number of peaks with deferent chemical shift comparing with the free ligands in the same solvent. The interesting result by mass spectrum of Ni(L7)2 complex compred with of L7 spectra shows parent peak at 977 confirming that the ligand L7 has lost one proton to give the desire complex in square planar geometry.
حميدة أحمد سالم العباني (2015)
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Histone deacetylase 2 inhibitor valproic acid attenuates bisphenol A-induced liver pathology in male mice

Accumulating evidence indicates the role of endocrine disruptor bisphenol A (BPA) in many pathological conditions. Histone deacetylase (HDAC) inhibition has potential for the treatment of many diseases/abnormalities. Using a mouse BPA exposure model, this study investigated the hepatoprotective effects of the Food and Drug Administration–approved HDAC2 inhibitor valproic acid (VPA) against BPA-induced liver pathology. We randomly divided 30 adult male Swiss albino mice (8 weeks old; N = 6) into five groups: group 1, no treatment (sham control (SC)); group 2, only oral sterile corn oil (vehicle control (VC)); group 3, 4 mg/kg/day of oral BPA (single dose (BPA group)); group 4, 0.4% oral VPA (VPA group); and group 5, oral BPA + VPA (BPA + VPA group). At the age of 10 weeks, the mice were euthanized for biochemical and histological examinations. BPA promoted a significant decrease in the body weight (BW), an increase in the liver weight, and a significant increase in the levels of liver damage markers aspartate aminotransferase and alanine aminotransferase in the BPA group compared to SC, as well as pathological changes in liver tissue. We also found an increase in the rate of apoptosis among hepatocytes. In addition, BPA significantly increased the levels of oxidative stress indices, malondialdehyde, and protein carbonylation but decreased the levels of reduced glutathione (GSH) in the BPA group compared to SC. In contrast, treatment with the HDAC2 inhibitor VPA significantly attenuated liver pathology, oxidative stress, and apoptosis and also enhanced GSH levels in VPA group and BPA + VPA group. The HDAC2 inhibitor VPA protects mice against BPA-induced liver pathology, likely by inhibiting oxidative stress and enhancing the levels of antioxidant-reduced GSH.
Mohamed A. Al-Griw, Zaynab Osama Alshibani, Rabia Omar abdullah Alghazeer, Mohamed Elhensheri, Refaat. M. Tabagh, Areej A. Eskandrani, Wafa S. Alansari, Mahmoud M. Habibulla, Ghalia Shamlan(6-2022)
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