New quinoline- and isoquinoline-based multicomponent methods for the synthesis of 1,1(3,3)-dicyanotetrahydrobenzoindolizines
作者:I. A. Sanin、A. A. Zubarev、A. Yu. Rudenko、L. A. Rodinovskaya、E. A. Batuev、A. M. Shestopalov
DOI:10.1007/s11172-018-2073-z
日期:2018.2
multicomponent methods for the synthesis of benzannulated dihydroindolizines based on quinoline or isoquinoline, malononitrile, aromatic aldehydes and α-halomethylcarbonyl compounds were developed. Several alternative protocols of using the reactants were studied, starting with separate generation of two most probable intermediates and ending with the four-componentcondensation of all reactants. The scope
Knoevenagel condensation catalysed with native and modified chitosan-based heterogeneous catalysts. The efficiency of our hydrogel organocatalysts, chitosan hydrogel beads and ureidyl-chitosan derivative hydrogel disks, was evaluated as function of pH, temperature and catalyst concentration by considering reaction rates, conversions, E/Z stereoselectivities, and kinetic studies of a model reaction between
Seven aromatichydrocarbons bearing a dicyanovinyl unit were prepared to determine the relationship between both the number of aromatic rings and location of acceptor substituent on their thermal and optoelectronic properties. Additionally, the density functional theory calculations were performed. The obtained compounds showed temperatures of the beginning of thermaldecomposition in the range of
Microporous coordination polymer [Zn4(dmf)(ur)2(ndc)4] as a heterogeneous catalyst for the Knoevenagel reaction
作者:S. A. Sapchenko、D. N. Dybtsev、V. P. Fedin
DOI:10.1007/s11172-014-0748-7
日期:2014.10
The catalytic properties of the microporous metal-organic coordination polymer [Zn4(dmf)(ur)2(ndc)4] (dmf is N,N’-dimethylformamide, ur is urotropine, and ndc2- is 2,6-naphthalenedicarboxylate) for the Knoevenagel reaction were studied. The reaction between aromatic aldehydes (benzaldehyde, α-naphthaldehyde, 4-biphenylaldehyde, and 1-pyrenaldehyde) and malononitrile was studied. The coordination polymer was shown to be a heterogeneous catalyst that makes it possible to achieve 95% yield in the reaction between benzaldehyde and malononitrile. The selectivity of the catalyst depends on the size of aldehydes used in the reaction.
Effect of electron withdrawing anchoring groups on the optoelectronic properties of pyrene sensitizers and their interaction with TiO2: A combined experimental and theoretical approach
sensitizers (PC, PN, PMN, PR) with various electronwithdrawing anchoring groups have been synthesized to understand their consequence on the optoelectronic properties. All the sensitizers have been characterized by NMR, mass spectroscopic and IR techniques. Absorption measurements revealed that charge transfer transition was enhanced by introducing electronwithdrawinggroups. Effect of solvents on the absorption