C 73 Condensation of 2-polyfluoroacycloalkanones with aldehydes and dimethylformamide-dimethylacetal [Text] / D. V. Sevenard, O. G. Khomutov, M. I. Kodess, K. I. Pashkevich, I. Loop, E. Lork, G. -V. Roeschenthaler // Australian Journal of Chemistry. - 2001. - Vol. 54, № 3. - P157-163 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: Polyfluorinated 1,3-diketones containing carbocycles react with aldehydes under Lewis-acid catalysis and also with dimethylformamide-dimetylacetal without catalysis, yielding exclusively (E)-configured condensation products involving the methylene group of the carbocycle. Novel trifluoromethylated chromenes are prepared from 2-trifluoroacetylcycloalkanones and salicylaldehyde. The structures of two new compounds, 2-(E)-benzylidene-6-trifluoroacetylcyclohexanone and 4-trifluoroacetyl-2,3-dihydro-1H-xantene, are confirmed by X-ray structure analysis. |
A 89 Asymmetric azomethine ligands based on 2-[(2-aminophenyl)aminomethylidene]-3-oxo-3-polyfluoroalkylpropionates and aldehydes [Electronic resource] / Yu. S. Kudyakova, M. V. Goryaeva, Ya. V. Burgart, V. I. Saloutin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2010. - Vol. 59, № 9. - P1753-1760 : рис., табл. - Bibliogr. : p. 1759-1760 (12 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): AZOMETHINES -- ALDEHYDES -- LIGANDS -- NICKEL(II) COMPLEXES -- COPPER(II) COMPLEXES -- ORGANOFLUORINE COMPOUNDS -- X-RAY DIFFRACTION STUDY Аннотация: The condensation of ethyl 2-[(2-aminophenyl)aminomethylidene]-3-oxo-3-polyfluoroalkyl-propionates with aldehydes (salicylaldehyde, furfural, and benzaldehyde) affords the corresponding azomethine derivatives exhibiting the complexing ability toward copper and nickel ions. \\\\Expert2\\nbo\\Russian Chemical Bulletin\\2010, 59 (9), 1753-1760.pdf |
S 98 Synthesis and photoluminescence properties of zinc(II) complexes with salicylaldehyde hetarylhydrazones [Electronic resource] / S. A. Melkozerov, I. G. Pervova, G. N. Lipunova, V. A. Barachevskii, I. N. Lipunov, E. A. Dvoskin // Russian Journal of General Chemistry. - 2013. - Vol.83, №4. - С. 646-651. - Bibliogr. : p. 651 (13 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ZINC(II) COMPLEXES -- SALICYLALDEHYDE BENZAZOLYL -- PYRIMIDINYLHYDRAZONES Аннотация: New zinc complexes of the salicylaldehyde benzazolyl- and pyrimidinylhydrazones were synthesized. Study of photophysical properties of the hydrazones and their complexes in solution showed that their structure and the luminescence intensities depend on the nature of the heterocyclic fragment included to the molecule \\\\expert2\\nbo\\Russian Journal of General Chemistry\\2013, V. 83, N 4, p. 646–651.pdf |
Stimuli-responsive dual cross-linked N-carboxyethylchitosan hydrogels with tunable dissolution rate / S. Bratskaya, A. Skatova, Y. Privar [et al.] // Gels. - 2021. - Vol. 7, № 4. - Ст. 188 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): HYDROGELS -- CHITOSAN -- SALICYLALDEHYDE Аннотация: Here, we discuss the applicability of (methylenebis(salicylaldehyde)—MbSA) for the fabrication of the stimuli-responsive N-carboxyethylchitosan (CEC) hydrogels with a tunable dissolution rate under physiological conditions. In comparison with non-covalent salicylimine hydrogels, MbSA cross-linking via covalent bis(‘imine clip’) and non-covalent hydrophobic interactions allowed the fabrication of hydrogels with storage moduli > 1 kPa at ten-fold lower aldehyde/CEC molar ratio with the preservation of pH- and amino-acid responsive behavior. Although MbSA-cross-linked CEC hydrogels were stable at neutral and weakly alkaline pH, their disassembly in cell growth medium (Dulbecco’s modified Eagle’s medium, DMEM) under physiological conditions was feasible due to transimination reaction with amino acids contained in DMEM. Depending on the cross-linking density, the complete dissolution time of the fabricated hydrogels varied from 28 h to 11 days. The cytotoxicity of MbSA cross-linked CEC hydrogels toward a human colon carcinoma cell line (HCT 116) and primary human dermal fibroblasts (HDF) was remarkably lower in comparison with CEC-salicylimine hydrogels. Fast gelation, relatively low cytotoxicity, and tunable stimuli-induced disassembly under physiological conditions make MbSA cross-linked CEC hydrogels promising for drug encapsulation and release, 3D printing, cell culturing, and other biomedical applications. |