gamma-Diimine palladium(II) based complexes mediated polymerization of methyl methacrylate

The synthesis of new palladium(II) complexes of the type [Pd(A-N=C-ph-C=N-A) Cl-2] (4a-e) (A = cyclohexyl (a), 2-isoprpropyl (b), pyrenyl (c), naphthyl (d), and 2,6-diisopropyl (e)) is described. The isolated gamma-diimine ligands and their corresponding palladium(II) complexes were characterized by their physical properties, elemental analysis, H-1 NMR=, C-13 NMR, and infrared spectroscopy. The palladium(II) complexes (4a-e) were employed successfully as catalysts for atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) in the presence of ethyl-2-bromoisobutyrate (EBIB) as initiator at 90 degrees C. Polymerization with these catalyst systems afforded polymers with low molecular weight distribution (M-w/M-n) and syndio-rich atactic poly (MMA) with relatively higher [rr] diads. (C) 2013 Production and hosting by Elsevier B.V.Peer reviewe

4-(4-Chloro­phen­yl)-1-(2-hydr­oxy-2,2-di­phenyl­acet­yl)thio­semicarbazide

The asymmetric unit of the title compound, C21H18ClN3O2S, contains two mol­ecules in which the bond lengths and angles are almost identical. Intra­molecular N—H⋯S hydrogen bonds result in the formation of two five-membered rings. In the crystal structure, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into centrosymmetric dimers; these dimers are linked via inter­molecular O—H⋯S hydrogen bonds, leading to infinite corrugated layers parallel to the bc plane through R 2 2(16) ring motifs

Novel palladium(II) and platinum(II) complexes with a fluoropiperazinyl based ligand exhibiting high cytotoxicity and anticancer activity in vitro

cis-Dichloro-palladium(II) and cis-dichloro-platinum(II) complexes (2, 4) of the general formula [M(N-N)Cl2] (M=Pd(II) and Pt(II), N-N= 1,2-diamino-4-fluoro-5-(4-methyl-1-piperazinyl) benzene, (DFMPB)) and the dicationic palladium(II) complex [Pd(N-N)(CH3CN)2](BF4)2 (3) have been prepared and characterized by elemental analysis, 1H-NMR-, mass spectroscopy, and IR spectroscopy. The cytotoxic effect of these complexes against MDA-231 and MCF-7 human breast cancer cell lines and K562 human leukemia cell line has been studied. The influence was dose dependent and varies with cell type. The palladium(II) complex (2) showed superior cytotoxic effect compared with the corresponding platinum(II) complex and the standard, cisplatin, when tested against all the above cell lines. 2016 Kayed A. Abu-Safieh et al.Scopu

New Treatment for Type 2 Diabetes Mellitus Using a Novel Bipyrazole Compound

2′,3,3,5′-Tetramethyl-4′-nitro-2′H-1,3′-bipyrazole (TMNB) is a novel bipyrazole compound with unknown therapeutic potential in diabetes mellitus. This study aims to investigate the anti-diabetic effects of TMNB in a high-fat diet and streptozotocin-(HFD/STZ)-induced rat model of type 2 diabetes mellitus (T2D). Rats were fed HFD, followed by a single low dose of STZ (40 mg/kg). HFD/STZ diabetic rats were treated orally with TMNB (10 mg/kg) or (200 mg/kg) metformin for 10 days before terminating the experiment and collecting plasma, soleus muscle, adipose tissue, and liver for further downstream analysis. TMNB reduced the elevated levels of serum glucose in diabetic rats compared to the vehicle control group (p 0.001). TMNB abrogated the increase in serum insulin in the treated diabetic group compared to the vehicle control rats (p 0.001). The homeostasis model assessment of insulin resistance (HOMA-IR) was decreased in the diabetic rats treated with TMNB compared to the vehicle controls. The skeletal muscle and adipose tissue protein contents of GLUT4 and AMPK were upregulated following treatment with TMNB (p 0.001, p p p p < 0.05) in diabetic rats compared to the vehicle controls. Conclusion: TMNB ameliorates insulin resistance, oxidative stress, and inflammation in a T2D model. TMNB could represent a promising therapeutic agent to treat T2D