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    Developments in transfer hydrogenations of aromatic ketones catalyzed by boron compounds
    (Taylor & Francis Ltd, 2017) Pasa, Salih; Gurler, Nedim; Temel, Hamdi; Rafikova, Khadichakhan; Aydemir, Murat
    Boron complexes BL1 and BL2 were prepared from O-donor ligands, 2,2'-(1E,1'E)-(ethane-1,2-diylbis(azan-1-yl-1-ylidene))bis(methane-1yl-1-ylidene)diphenol (L1) and 2,2'-(propane-1,3-diylbis(azan-1-yl-1ylidene)) bis(methane-1-yl-1-ylidene) diphenol (L2). The complexes were fully characterized by H-1 and C-13 NMR, LC-MS/MS, TGA/DTA, UV-Vis, elemental analysis, SEM, and FTIR. The transfer hydrogenation of acetophenone derivatives was investigated by the boron complexes in the presence of isoPrOH, as the hydrogen source, under basic condition with NaOH. The results showed that the boron complexes were promising catalytic precursors for transfer hydrogenation of aromatic ketones in 0.1 M isoPrOH solution (up to 99%). Both steric and electronic factors of this class of molecules had a significant impact on the catalytic properties. [GRAPHICS] .
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    Öğe
    The fabrication of bilayer polylactic acid films from cross-linked starch as eco-friendly biodegradable materials: Synthesis, characterization, mechanical and physical properties
    (Pergamon-Elsevier Science Ltd, 2020) Gurler, Nedim; Pasa, Salih; Alma, M. Hakki; Temel, Hamdi
    In this study, pure potato starch (PPS) was purified from waste potato residual to fabricate cross-linked bilayer materials with the casting method. Malonic acid (MA) was employed to get cross-linked material from PPS as PPS-MA. Then polylactic acid (PLA) was also implemented onto PPS and PPS-MA to produce bilayer materials as PPS-PLA and PPS-MA-PLA. The obtained these bilayer films were characterized by FTIR, XRD, and TGA. The mechanical and physical applications such as water vapor permeability, water uptake, moisture content, solubility, and opacity were investigated. The biodegradation calculations were also done by the process of composting. It has demonstrated that each application onto PPS increased the mechanical features. However, elongation wasn't seen during the breaking test of PPS and PPS-MA films, whereas the PPS-PLA and PPS-MA-PLA films demonstrated 9.34% and 10.14% elongation at break that substantiates the structural durability against rupture, fragmentation, and feeble. Furthermore, the water vapor permeability, water uptake, moisture content, and solubility decreased but the opacity has increased.