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    Wyświetlanie 1-4 z 4
    Tytuł:
    Technologie syntezy fluorofunkcyjnych związków krzemu
    Technologies of syntheses of fluorofunctional silicon compounds
    Autorzy:
    Maciejewski, H.
    Karasiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1219223.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    fluorokarbosilany, hydrosililowanie
    kompleksy rodu
    ciecze jonowe
    fluorocarbosilanes
    hydrosilylation
    rhodium complexes
    ionic liquids
    Opis:
    W artykule przedstawiono uniwersalną metodę syntezy dla różnorodnych fluorofunkcyjnych pochodnych krzemoorganicznych (silanów, polisiloksanów i silseskwioksanów) w oparciu o procesy hydrosililowania eterów allilowo-fluoroalkilowych, katalizowane siloksylowym kompleksem rodu [{Rh(?-OSiMe3)(cod)}2], im mobilizowanym w cieczy jonowej. Dla powyższego procesu przeprowadzono badania optymalizacyjne i określono podstawowe założenia technologiczne.
    A versatile method was presented for synthesis of different fluorofunctional organosilicon derivatives (silanes, polysiloxanes and silsesquioxanes) based on hydrosilylation of allyl-fluoroalkyl ethers. The process of hydrosilylation was catalysed by rhodium siloxide complex [{Rh-OSiMe3)(cod)}2] immobilised in ionic liquid. Studies on optimisation of the above process were performed and a brief foredesign was worked out.
    Źródło:
    Chemik; 2012, 66, 7; 735-741
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Katalizowane cynkiem asymetryczne hydrosililowanie ketonów i imin
    Zinc-catalyzed asymmetric hydrosilylation of ketones and imines
    Autorzy:
    Gajewy, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/172235.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    kataliza asymetryczna
    hydrosililowanie
    kompleksy cynku
    enancjoselektywność
    aktywacja asymetryczna
    asymmetric catalysis
    hydrosilylation
    zinc complexes
    enantioselectivity
    asymmetric activation
    Opis:
    One of the fundamental research goals in modern chemistry is the development of efficient and selective procedures to access organic compounds. Among all of the methodologies developed so far, catalysis offers an efficient and economical approach to enantiomericaly pure substances. In particular, transition metal catalysts modified by ligands, usually phosphines, are one of most successful examples of practical catalysis. Unfortunately, most of the applied metals (e.g., Pd, Rh, Ru, Ir) are low abundant, toxic and expensive. For this reason, recent research is focusing on their replacement by cheaper and low toxic metals. For example, the use of zinc can be of great interest, due to its abundance (0.0076% in the earth crust), biological relevance and distinct abilities. In the last two decades many scientific group have been working on finding new, high efficient and inexpensive catalytic system based on zinc for enantioselective transformations. It has been found that many of important organic reactions (for example aldol, Diels-Alder, Friedel-Crafts, Henry reactions) in their asymmetric version can be catalyzed by zinc complexes. One of them is also asymmetric reduction of double carbon-heteroatom bonds through addition of hydride (from silane). Hydrosilylation reduction is a promising alternative for the catalytic transformation of organic molecules to other reduction methods such as: hydrogenation and transfer hydrogenation owing to its operational simplicity and mild conditions. This review will give a general overview of the possible applications of zinc-catalyzed hydrosilylation of carbonyl compounds and imines. Since the understanding of mechanism of reaction is crucial for rational planning of new and more efficient ligands, some part of this article was devoted for mechanical considerations.
    Źródło:
    Wiadomości Chemiczne; 2013, 67, 5-6; 521-562
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kataliza procesów hydrosililowania z udziałem cieczy jonowych
    Catalysis of hydrosilylation processes with the participation of ionic liquids
    Autorzy:
    Bartlewicz, Olga
    Szymańska, Anna
    Jankowska-Wajda, Magdalena
    Dąbek, Izabela
    Maciejewski, Hieronim
    Powiązania:
    https://bibliotekanauki.pl/articles/1413312.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    hydrosililowanie
    kompleksy Rh
    kompleksy Pt
    ciecze jonowe
    SILPC
    kataliza heterogeniczna
    hydrosilylation
    Rh complexes
    Pt complexes
    ionic liquids
    heterogeneous catalysis
    Opis:
    Hydrosilylation is a fundamental and elegant method for the laboratory and industrial synthesis of organosilicon compounds. The hydrosilylation reaction is usually performed in a single-phase homogeneous system. A major problem, particularly in homogeneous catalysis, is the separation of catalyst from the reaction mixture. The presence of metals in the reaction products, even in trace quantities, is unacceptable for many applications, therefore efforts have been made at applying heterogeneous catalysts or immobilised metal complexes in order to obtain high catalytic activity and easy product isolation at the same time. One of the methods for producing such catalysts is the employment of ionic liquids as agents for the immobilization of metal complexes. Biphasic catalysis in a liquid-liquid system is an ideal approach through which to combine the advantages of both homogeneous and heterogeneous catalysis. The ionic liquids (ILs) generally form the phase in which the catalyst is dissolved and immobilized. In our research we have obtained a number of catalytic systems of such a type which were based on rhodium and platinum complexes dissolved in phosphonium, imidazolium, pyridinium and ammonium liquids. Currently, there has a common trend to obtain heterogenized systems that combine advantages of homogeneous and heterogeneous catalysis, which makes the hydrosilylation process more cost- effective. Such integration of homo- and heterogeneous catalysts is realized in several variants, as supported IL phase catalysts (SILPC) and solid catalysts with ILs layer (SCILL). Although all the above systems show high catalytic activities, their structure is unknown. This is why we have made attempts to modify selected ionic liquids (corresponding to our most effective systems) and we have applied them as ligands in the synthesis of platinum and rhodium complexes. Another group of catalysts comprises anionic complexes of rhodium and platinum which were obtained by reactions between halide complexes of metals and a respective ionic liquid. Most of the obtained complexes are solids insoluble in hydrosilylation reagents and are characterized by a high catalytic activity. A considerable development of heterogeneous catalysts of this type and their application in many hydrosilylation processes can be expected in the future. This mini-review briefly describes the recent progress in the design and development of catalysts based on the presence of ionic liquids and their applications for hydrosilylation processes.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 1-2; 5-29
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kompleksy platyny typu Markó zawierające n-heterocykliczne ligandy karbenowe O właściwościach supersterycznych
    Markó-type platinum complexes containing bulky n-heterocyclic carbene ligands
    Autorzy:
    Bolt, Małgorzata
    Żak, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/1413313.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    N-heterocykliczne ligandy karbenowe
    kompleksy platyny
    kataliza homogeniczna
    hydrosililowanie
    dimeryzacja
    N-heterocyclic carbene ligands
    platinum complexes
    homogeneous catalysis
    hydrosilylation
    dimerization
    Opis:
    Progress in technology implying increasing demand for advanced materials dedicated for specific application has become a driving force stimulating research in different branches of science. It has been estimated that over 90% highly processed compounds have been obtained by the methods whose pivotal processes take place in the presence of catalysts based on transition metal complexes. Although these processes permit obtaining desired products, they are often charged with numerous drawbacks that prevent their implementation in industry. That is why the search for new catalytic systems ensuring high efficiency of final products and a possibility of reaction control is still an important direction of studies. Markó complexes are a group of platinum(0) coordination compounds of type [(NHC)Pt(dvtms)]. Although much attention has been recently attracted to these class of compounds, their number reported in hitherto literature is still limited. Owing to the possibility of wide modification of NHC carbene ligand attached to metal, the structures, and thus also properties, of the final complexes can be relatively easily matched to the requirements of individual catalytic reactions. It is particularly interesting in view of permanent development of new technologies and still increasing demand for new synthetic methods of more sophisticated materials dedicated to specific applications. In this paper, the synthesis and characterization of Markó type platinum(0) complexes containing bulky N-heterocyclic carbene ligands is described and their applications in the synthesis of new and unknown organic and organosilicon compounds are discussed. The main advantages of these complexes are highlighted providing an overview of this fascinating area of research.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 1-2; 31-53
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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