Green preparation of Pd nanoparticles on SBA-15 via supercritical fluid deposition and application on Suzuki-Miyaura cross-coupling reaction

WOS: 000442004400002A well-dispersed green Pd/SBA-15 catalyst with an average size of 13.7 nm and 492.6 m(2)/g BET surface area is prepared via supercritical fluid deposition method with a new bipyridyl precursor that enables reduction at mild conditions at 80 degrees C and 17.2 MPa. The catalytic performance of Pd/SBA-15 prepared using scCO(2) with hydrogen reduction was assessed for Suzuki-Miyaura coupling reaction of bromobenzene and phenylboronic acid that was chosen as a model coupling reaction. The catalyst was tested in six different solutions and in three organic and inorganic bases during reactions. In general, the effect of bases is investigated when solvents are held constant and K2CO3 appears to have the best results in the activity studies used. For each of the 3 bases used, the highest catalytic activity was reached as the result of the solvent system being ethanol/water (1: 1). The highest catalytic conversion was obtained in the ethanolK(2)CO(3) solvent-base pair. The catalyst synthesized in this study exhibited high activities and TON value was found as 160.8 at room temperature.Management Unit of Scientific Research Projects of Cukurova University (BAP) [FDK-2015-3668]; Scientific and Technological Research Council of TurkeyTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [BIDEB 2211-E]This study was funded by the Management Unit of Scientific Research Projects of Cukurova University (BAP project no: FDK-2015-3668 under thesis). Dr. Fatma Ulusal has received research grants from Scientific and Technological Research Council of Turkey (BIDEB 2211-E domestic graduate scholarship program)

1-((E)-{(1R,2R)-2-[(E)-(2-hydroxy-1-naphthyl)methyleneamino]cyclohexyl}iminiomethyl)naphthalen-2-o late : a Schiff base compound having both OH and NH character

WOS: 000245469800022PubMed ID: 17413230The title Schiff base compound, C28H26N2O2, possesses both OH and NH tautomeric character in its molecular structure. While the OH side of the compound is described as an intermediate state, its NH side adopts a predominantly zwitterionic form. The molecular structure of the compound is stabilized by both N+ - H center dot center dot center dot O- and O - H center dot center dot center dot N intramolecular hydrogen bonds. There are two weak C - H center dot center dot center dot O hydrogen bonds leading to polymeric chains of topology C(5) and C(13) running along the b axis of the unit cell. In addition, intermolecular C - H center dot center dot center dot pi interactions serve to stabilize the extended structure

Supercritical carbondioxide deposition of gamma-Alumina supported Pd nanocatalysts with new precursors and using on Suzuki-Miyaura coupling reactions

WOS: 000405879400014New non-fluorinated precursors (Pd(PTQD)(2) and Pd(DGM)(2)) derived from Pd(II) complexes of dimethylglioxime (DMG) and phenanthrenequinonedioxime (PTQD) were used for supercritical carbondioxide deposition of Pd on gamma-Alumina support. Homogeneous well-dispersed Pd nanoparticles on gamma-Alumina with a size range of 2 nm (for Pd(PTQD)(2)) and 7 nm (for Pd(DGM)(2)) were detected with HR-TEM micrographs. Moreover, XRD analysis showed that the synthesized structures were composed of cubic and octahedral crystals as Pd and PdHX nanoparticles with a high ratio of PdHX. Then, the prepared nanoparticles were used as catalysts for Suzuki-Miyaura reactions of bromobenzene and phenylboronic acid in two different solutions of n-methyl-2-prolydon and dimethylformamide at 60 degrees C. Two bases K2CO3 and Na2CO3 were used to observe their interactions with the catalysts. For all cases, catalysts prepared from Pd(PTQD)(2) showed better performance. This is attributed to the smaller particle size distribution in Pd(PTQD)(2) than Pd(DMG)(2) catalysts.Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [111T153]; Scientific and Technological Research Council of Turkey (BIDEB 2211-E domestic graduate scholarship program)This project was financially supported by Scientific and Technological Research Council of Turkey (TUBITAK project number 111T153 and BIDEB 2211-E domestic graduate scholarship program). These are gratefully acknowledged

Magnetic nanoparticles for in vitro artificial blood development: glutaraldehyde linked hemoglobin molecules

WOS: 000379514000101