Two new complexes, [M II (L)(Cl)(H 2 O) 2 ]•H 2 O (where M = Ni or Ru and L = heterocyclic Schiff base, 3hydroxyquinoxaline-2-carboxalidene-4-aminoantipyrine), have been synthesized and characterized by elemental analysis, FT-IR, UV-vis diffuse reflectance spectroscopy, FAB-MASS, TG-DTA, AAS, cyclic voltammetry, conductance and magnetic susceptibility measurements. The complexes have a distorted octahedral structure and were found to be effective catalysts for the hydrogenation of benzene. The influence of several reaction parameters such as reaction time, temperature, hydrogen pressure, concentration of the catalyst and concentration of benzene was tested. A turnover frequency of 5372 h −1 has been found in the case of ruthenium complex for the reduction of benzene at 80 • C with 3.64 × 10 −6 mol catalyst, 0.34 mol benzene and at a hydrogen pressure of 50 bar. In the case of the nickel complex, a turnover frequency of 1718 h −1 has been found for the same reaction with 3.95 × 10 −6 mol catalyst under similar experimental conditions. The nickel complex shows more selectivity for the formation of cyclohexene while the ruthenium complex is more selective for the formation of cyclohexane.

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An efficient and high yielding Cu-catalyzed direct C-H arylation of azaheterocycles including oxadiazoles, thiadiazoles, benzoxazoles and benzothiazoles has been achieved by employing easily accessible diaryliodonium salts.

Please cite this article as: Varsha, G., Arun, V., Robinson, P.P., Sebastian, M., Varghese, D., Leeju, P., Jayachandran, V.P., Yusuff, K.K.M., Two new fluorescent heterocyclic perimidines: first syntheses, crystal structure and spectral characterization, Tetrahedron Letters (2010Letters ( ), doi: 10.1016Letters ( /j.tetlet.2010 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. An efficient one-pot synthesis of two new heterocyclic perimidines in good yields is presented. This methodology provides a simple, straightforward synthetic route to these interesting classes of heterocycles. Crystal structure, solvatochromism and antibacterial activity of these organic compounds are discussed. ACCEPTED MANUSCRIPT Graphical AbstractLeave this area blank for abstract info. Science and Technology, Cochin-682 022, Kerala, India, Phone: +91-484-2575804, E-mail: yusuff15@gmail.com; yusuff@cusat.ac.in b Department of Biosciences, Sree Narayana Guru Institute of Science and Technology, Kerala, India. Abstract-An efficient one-pot synthesis of two new heterocyclic perimidines 4-(2,3-dihydro-1H-perimidin-2-yl)-2-methoxyphenol and 2-(quinoxalin-2-yl)-2,3-dihydro-1H-perimidine in good yields is presented. This methodology provides a simple, straightforward synthetic route to these interesting classes of heterocycles. Crystal structure, solvatochromism and antibacterial activity of these organic compounds are discussed. ACCEPTED MANUSCRIPT

A recipe for potency: A novel series of bis(indolyl)-1,3,4-oxadiazoles was prepared from the corresponding hydrazide-hydrazones via iodobenzene diacetate-promoted oxidative cyclization. Evaluation against a panel of human cancer cell lines revealed that some derivatives possess potent cytotoxicity with tunable selectivity for different cancer types.