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    Wyświetlanie 1-5 z 5
    Tytuł:
    Magnetic recykling of complex catalysts immobilized on thiol-functionalized polymer supports
    Autorzy:
    Bączek, N
    Strzelec, K.
    Wąsikowska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/779554.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    encapsulation
    magnetic recycling
    epoxy resin
    supported catalysts
    Heck reaction
    hydrogenation reaction
    Opis:
    In this work, the application of the thiol-functionalized epoxy resin encapsulated on magnetic core as supports for palladium catalysts is reported. The study focuses on obtaining of heterogeneous catalysts which can be separated by magnetic field. Palladium complex catalyst [PdCl2(PhCN)2] has been heterogenized by anchoring to these supports via ligand exchange reaction. The characterization of polymeric supports and heterogenized palladium catalysts has involved research methods like time-of-flight secondary ion mass spectrometry (TOF-SIMS), scanning electron microscopy (SEM) and nitrogen BET surface area measurements. The activity and stability during long-term use of the investigated catalytic systems were tested in a Heck and hydrogenation reaction. The influence of the type of thiols used as epoxy hardeners and the morphology of the supports on the catalytic properties of epoxy-supported palladium catalysts was discussed.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 3; 65-68
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Screening of the catalytic activity of pd0 and pd2+- supported on chitosan beads and cryogels
    Autorzy:
    Pestov, Aleksandr
    Mekhaev, Aleksandr
    Privar, Yuliya
    Prokuda, Natalya
    Modin, Evgeniy
    Bratskaya, Svetlana
    Powiązania:
    https://bibliotekanauki.pl/articles/1034532.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    Heck reaction
    catalysis
    chitosan
    cryogel
    hydrodechlorination
    hydrogenation
    Opis:
    Here, we report the results of screening of the catalytic activity of Pd-containing chitosan beads and cryogels in the cross-coupling reaction, hydrogenation of alkenes, nitro-, and carbonyl compounds and the hydrodechlorination of chlorophenols. Pd0-containing chitosan beads and cryogels show moderate catalytic activity in the reduction of alkenes and nitroaromatics. The conversion of nitroaromatics decreases for substrates with electron-withdrawing substituents, while the conversion of alkenes increases with the activation of carbon-carbon double bonds. For several substrates, a significant difference in kinetics and conversion degrees was observed for Pd nanoparticles supported on chitosan beads and cryogels. It was found that conversion in the hydrodechlorination reaction depends on substrate structure, being higher for substrates containing substituents with a positive mesomeric effect. Pd2+-chitosan catalysts showed high catalytic activity in cross-coupling (Heck reaction) offering the following advantages over known catalytic systems: lower reaction temperature, the selective functionalisation of C-I bonds, and the possibility to perform reactions with iodobenzene without base addition.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 149-158
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalytic hydrogenation in the process of 2-((1-benzylpiperidin-4-yl) methyl)-5,6-dimethoxy-2,3-dihydroinden-1-one hydrochloride synthesis I. Catalyst screening and finding the optimal reaction conditions
    Autorzy:
    Samardzic, Z. M.
    Zrncevic, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779143.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    catalytic hydrogenation
    catalyst screening
    catalyst selectivity
    optimal reaction conditions
    Opis:
    Catalytic hydrogenation of 2-((1-benzyl-1,2,3,6-tetrahydropyridin-4-yl)methylene)-5,6-dimethoxy-2,3-dihydroinden- 1-one hydrochloride () to 2-((1-benzylpiperidin-4-yl)methyl)-5,6-dimethoxy-2,3-dihydroinden- 1-one hydrochloride (2) was investigated in the batch-slurry reactor. The 5% Pt/C catalyst was chosen to search the optimal reaction conditions because of its higher catalytic activity compared to other catalysts used in the work. To investigate the catalyst activity, selectivity and stability, the effect of agitation speed, catalyst loading, solvent, temperature, hydrogen pressure and catalyst reuse were studied. The initial rate of hydrogenation increases with the increase of catalyst loading, with the temperature and solvent polarity, if alcohols were used as solvents. The hydrogenation rate decreases with higher hydrogen pressure and that was explained by competitive adsorption of both reactants. The results also indicate that 5% Pt/C is a promising catalyst for 1 hydrogenation because at relatively mild reaction conditions selectivity towards main product was high (98%) and catalyst maintains its activity during successive runs.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 3; 38-47
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Katalizatory palladowe immobilizowane w materiałach typu MOF aktywne w reakcjach uwodornienia
    Palladium catalysts immobilized in MOF materials active in hydrogenation reactions
    Autorzy:
    Augustyniak, Adam W.
    Trzeciak, Anna M.
    Powiązania:
    https://bibliotekanauki.pl/articles/172135.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    sieci metaliczno-organiczne
    kataliza
    pallad
    uwodornienie
    selektywność
    metal-organic frameworks
    catalysis
    palladium
    hydrogenation
    reaction
    selectivity
    Opis:
    Palladium immobilized in metal-organic frameworks (MOF) exhibit promising catalytic properties in hydrogenation of different unsaturated substrates. Due to the specific porous and crystalline structure MOFs can contribute in bonding and activation of organic substrates, increasing catalytic efficiency of Pd@MOF composites. The superior tunability of MOFs structures enables to design highly selective catalysts for hydrogenation of different substrates, such as olefins, esters, ketones, alcohols or alkynes. Due to the synergistic effects of palladium and MOF not only high activity but also high selectivity can be achieved. The article presents representative examples of MOF-based palladium catalysts for hydrogenation to illustrate perspectives, also technological, of their application.
    Źródło:
    Wiadomości Chemiczne; 2019, 73, 3-4; 221-241
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synteza γ-laktonów z podstawnikami aromatycznymi
    Synthesis of γ-lactones with aromatic substituents
    Autorzy:
    Skrobiszewski, A.
    Gładkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/171624.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    gamma laktony
    pierścienie aromatyczne
    reakcja Suzuki-Miyaury
    enzymatyczna estryfikacja i hydroliza
    mikrobiologiczna redukcja grupy karbonylowej
    diastereoselektywne alkilowanie
    enancjoselektywne uwodornienie podwójnego wiązania
    gamma-lactones
    aromatic rings
    Suzuki-Miyaura reaction
    enzymatic hydrolysis and acetylation
    microbial reduction of a carbonyl group diastereoselective alkylation
    enantioselective hydrogenation of olefinic substrates
    Opis:
    Biological activities of lactones are predominantly determined by different substituents on a lactone ring. γ-Lactones with aromatic substituents have interesting biological activities and serve as useful intermediates in the synthesis of many natural and synthetic products. Pulvinic and vulpinic acids exhibit antimicrobial, antioxidant and anticancer activity [1–3]. Paraconic acids have anticancer and antibacterial activity [4, 5]. The interesting biological activities i.a. antileukemic, anti- HIV and cytostatic, have been found for dibenzyl-γ-lactones [8]. This review covers some examples of synthetic and biotechnological methods leading to either racemic or optically active γ-lactones with aromatic substituents. The racemic α-benzylidene lactones can be produced from Baylis-Hillman acetates [9]. The multicomponent synthesis of the paraconic acid analogs is performed by a fourfold metallation-conjugate addition-aldol addition-intramolecular transesterification sequence [4]. Suzuki-Miyaura reaction is the key step in the synthesis of asymmetric pulvinic acids [1]. Some other examples of synthetic strategies involving the reactivity of ylides, vicinal dianions, ozonolysis or Claisen rearrangement are also presented [10–13]. Production of optically active γ-lactones with aromatic substituents involves application of biotechnological and chemical methods. The first one includes using commercially available enzymes [16, 17] or whole cells of microorganisms [18–20]. Chemical methods involve application of chiral starting materials like malic acid esters or the derivatives of succinic acid [14, 15] or chiral catalysts like BINAP-Rh or Ru complexes [7].
    Źródło:
    Wiadomości Chemiczne; 2013, 67, 9-10; 943-960
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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