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    Tytuł:
    CO2 zamiast CO : katalityczna konwersja CO2 w syntezie związków karbonylowych
    CO2 instead of CO : catalytic conversion of CO2 in the synthesis of carbonyl compounds
    Autorzy:
    Wójcik, Ewelina
    Trzeciak, Anna M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1410899.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    ditlenek węgla
    karbonylacja
    kataliza
    redukcja
    silany
    carbon dioxide
    carbonylation
    catalysis
    reduction
    silanes
    Opis:
    Modem industrial carbonylation processes, leading to functionalized carbonyl compounds, are based on the application of highly toxic and flammable carbon monoxide. Recently, carbon dioxide which is non-toxic and abundant, has attracted attention as a perfect C1 source to build new C-C and C-N bonds. From the standpoint of green and sustainable chemistry, it is appealing and challenging to combine the reduction of CO2 with subsequent carbonylation using in situ formed CO. Herein we present the application of CO2 as C1 building block for the carbonylation of different organic compounds in the presence of transition metal catalysts (e.g. Pd, Rh, Ru, Fe). Industrially important organic compounds has been obtained in hydroformylation, dehydrogenation, hydrogenation, aminocarbonylation and carboxylation reactions with CO2. On the other hand, rapid reduction of CO2 to CO could processed in the metal catalyst - free systems, using a catalytic amount of fluoride salt and stoichiometric amount of di- or hydrosilane. In these reactions silyl formate has been identified as an important intermediate formed from silane and carbon dioxide. Also hydrazine and sodium borohydrate have been used for CO2 reduction to formic acid or other products. Obviously, these reactions could be restricted because of their sensitivity to the applied conditions, high cost of reactants as well as the waste generated. The presented examples of catalytic carbonylation reactions with CO2 as a source of CO group illustrate a high technological potential of this strategy.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 3-4; 395-422
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Otrzymywanie i właściwości adsorpcyjne sieci metaloorganicznych
    Synthesis and adsorption properties of metal-organic frameworks
    Autorzy:
    Szeligowska, S.
    Choma, J.
    Jaroniec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/171540.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    sieci metaloorganicze
    MOF
    synteza materiałów MOF
    adsorpcja
    CO2
    adsorpcja H2
    metal-organic frameworks
    synthesis of MOF materials
    adsorption
    H2 adsorption
    Opis:
    MOF materials or metal-organic frameworks are compounds consisting of metal ions or clusters (metal junctions) and organic ligands (bridging groups) connected via coordination bonds. Since a variety of organic ligands and metal junctions is available, metal-organic frameworks of desired composition and structures can be synthesized. These compounds are relatively new, intensively studied, their number is continuously growing from year to year. Metalorganic frameworks may also possess elastic properties due to the presence of coordination bonds in their structure. A distinct feature of MOF materials, which differentiates them from other sorbents, is the possibility of changing their pore structure under influence of external stimuli and the ability of adjusting their pore size to the dimensions of the adsorbed molecules. An interesting phenomenon observed in these materials is the so-called “breathing” effect that is manifested by drastic changes in the pore volume upon external stimuli such as temperature, pressure, type of adsorbate, presence of solvent. There are numerous methods for the preparation of MOF materials: solvothermal, electrochemical, mechanochemical, sonochemical and microwave-assisted syntheses. An additional activation of these materials is often required to remove the remaining solvents from pores and consequently, increase their adsorption capacity. The latter can be also increased by additional modifications that can be used to tune their physicochemical properties, and especially porosity. Due to the excellent adsorption properties of MOF, especially very high BET specific surface area (up to 6200 m2/g) and large pore volume, these materials have been intensively studied for capture or storage of various gases such as CO2, H2 and CH4. Applications of metal-organic frameworks are continuously growing and range from gas storage, chemical sensors and phosphors to medicine, where they are used as drug carriers.
    Źródło:
    Wiadomości Chemiczne; 2017, 71, 5-6; 299-322
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie zielonych rozpuszczalników w syntezie nienasyconych związków boro- i krzemoorganicznych na drodze reakcji hydrometalacji i sprzęgania Marcińca
    Application of green solvents in the synthesis of unsaturated organoboron and organosilicon compounds via catalytic hydrosilylation and Marciniec coupling reactions
    Autorzy:
    Walkowiak, Jędrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1413280.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    hydrometalacja
    reakcja sprzęgania
    CO2 w stanie nadkrytycznym
    ciecze jonowe
    poli(glikol etylenowy)
    PEG
    kataliza homogeniczna
    hydrometallation
    coupling reaction
    supercritical CO2
    ionic liquids
    poly(ethylene glycol)
    homogeneous catalysis
    Opis:
    Unsaturated organoboron and organosilicon compounds constitute an important class of organometallic compounds, which due to the presence of silyl- or boryl- group attached to Csp2 atoms, their simple and straightforward transformations in coupling and demetallation reactions, found a broad range of applications in the synthesis of fine chemicals or new materials with tailored properties. Such compounds might be synthesized in many transformations but two of them: hydrometallation and Marciniec coupling reactions permitted to obtain compounds with high effectivity, selectivity, and in the case of hydrometallation reactions with excellent atom economy. Most of these processes occur in a homogeneous phase, which ensures excellent yields and stereo- and regioselectivity. On the other hand, such conditions generate problems with catalyst reuse, product separation, and substantial consumption of toxic, volatile organic solvents. According to the assumptions of sustainable development in chemistry, the new procedures, which allow to intensify the process in terms of its efficiency, according to green chemistry rules are of prior importance in modern chemical industry. In this manuscript, the newest achievements in the application of green solvents (ionic liquids, liquid polymers, and supercritical CO2) in catalytic hydrometallation of alkynes and coupling of vinylmetalloids with olefins are discussed. Such an approach builds a new strategy for effective catalyst immobilization and its reuse, the increase of process productivity by the application of repetitive batch processes, and elimination of organic solvents, typically used in these transformations. Selected contributions in this field of chemistry are presented within this review.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 1-2; 111-136
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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