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    Öğe
    The effect of benzo substitution on complexation of diaza 18-crown-6 ethers derivatives with NaClO4 (vol 52, pg 51, 2005)
    (Springer, 2006) Koeylue, M. Zafer; Demirel, Nadir; Polat, F. Doganel; Yilmaz, Ali; Hosgoeren, Halil; Balci, Metin
    [Abstract Not Available]
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    Öğe
    Synthesis of novel chiral Schiff-base ligands and their application in asymmetric nitro aldol (Henry) reaction
    (Pergamon-Elsevier Science Ltd, 2007) Colak, Mehmet; Aral, Tarik; Hosgoeren, Halil; Demirel, Nadir
    Chiral Schiff-bases prepared from chiral amino alcohols catalyze the enantio selective Henry (nitro aldol) reaction between nitromethane and p-nitrobenzaldehyde in the presence of Cu(OTf)(2) and Zn(OTf)(2). Zn(OTf)(2) promoted the reaction yield, while Cu(OTf)(2) promoted the enantiomeric excess. The highest enantioselectivities were observed with ligand 3 (44% ee) and ligand 5 (47% ee). (C) 2007 Elsevier Ltd. All rights reserved.
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    Öğe
    Two-component organogelators: combination of N?-alkanoyl-L-lysine with various N-alkanoyl-L-amino acids: additional level of hierarchical control
    (Taylor & Francis Inc, 2018) Colak, Mehmet; Baris, Deniz; Evcil, Murat; Demirel, Nadir; Hosgoeren, Halil
    Synthesis of two-component organogelation system was performed very easy and concise manner from N-epsilon-palmitoyl-L-lysine ethyl ester and N-epsilon-miristoyl-L-lysine ethyl ester in which they were used as base component and N-lauroyl-L-amino acids (amino acids:, alanine, leucine and phenylalanine as acid components.). And their organogelation properties were examined in different pharmaceutical fluids such as liquid paraffin, fatty acid ethyl, and isopropyl esters. In this way, gelation efficiency was ascertained variations of alkanoyl moieties and combination of different amino acids in the gelator structures. Characterization of gelators was performed via thermal measurement such as Tg and gel-sol enthalpy change; SEM and FTIR as optical methods.