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Wyszukujesz frazę "Diels-Alder reaction" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Chiral pyrrolidinium salts derived from menthol as precursor – synthesis and properties
Autorzy:
Janus, E.
Gano, M.
Powiązania:
https://bibliotekanauki.pl/articles/778746.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
pyrrolidinium chiral salts
chiral ionic liquids
menthol
Diels-Alder reaction
Opis:
Six new chiral pyrolidinium salts with chiral substituent at quaternary nitrogen atom were synthesized with high overall yields from (-)-menthol as cheap chiral precursor and were identified by NMR and HRMS spectroscopy. It was shown that anion type had the effect on chemical shift of protons adjacent to quaternary nitrogen atom and physical properties of these salts. Salts with NTf2  or NPf2  were in a liquid state at room temperature and characterized with the highest thermal stability among others. Furthermore, chiral ionic liquid with NTf2  anion was used as solvent in Diels-Alder reaction and gave higher yield and stereoselectivity than in ionic liquids with achiral cations. Synthesized chiral salts have the potential as chiral solvents in synthesis and auxiliaries in analytical methods to improve chiral recognition.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 3; 92-98
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acidic ionic liquids based on phosphonium chloride and metal chlorides – recyclable media and catalysts in the Diels-Alder reaction
Autorzy:
Janus, E.
Powiązania:
https://bibliotekanauki.pl/articles/779559.pdf
Data publikacji:
2010
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
kwaśne ciecze jonowe
reakcja Dielsa-Adlera
chlorki metali
acidic ionic liquids
Diels-Alder reaction
metal chlorides
Opis:
Acidic ionic liquids based on trihexyltetradecylphosphonium chloride . P 6.6.6.14 Cl and six different metal chlorides (YCl 3 , YbCl 3 , MgCl 2 , ZnCl 2 , CuCl 2 , InCl 3 ) were prepared. The molar fraction of metal chloride (X MClx ) used for the formation of acidic ionic liquids with P 6.6.6.14 Cl was changed in the range from 0.3 to 0.5. The high catalytic activity in the Diels-Alder reaction of cyclopentadiene and various �ż,s-unsaturated carbonyl compounds showed ionic liquids at X MClx.0.4. In general, the highest product yields and endo:exo ratios were achieved in the acidic ionic liquids formed from MgCl 2 , YCl 3 and YbCl 3 . Thermogravimetric analysis suggested that the prepared ionic liquids were thermally stable up to nearly 400�‹C. Additionally, they could be reused with only little loss of catalytic activity after the 4th recycle.
Źródło:
Polish Journal of Chemical Technology; 2010, 12, 2; 33-37
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mg(OTf)2 + ionic liquid – recyclable catalytic system in diels-alder reaction
Autorzy:
Bittner, B.
Milchert, E.
Janus, E.
Powiązania:
https://bibliotekanauki.pl/articles/779322.pdf
Data publikacji:
2010
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
reakcja Dielsa-Aldera
ciecze jonowe
kwasy Lewisa
pochodne norbornenu
Diels-Alder reaction
ionic liquids
Lewis acids
norbornene derivatives
Opis:
A comparative study of Diels-Alder reaction between cyclopentadiene and dimethyl maleate in catalytic system is reported. The catalytic system was formed from ionic liquid which was made of N-hexylpyridinium bis(trifluoromethylsulfonyl)imide and magnesium trifluoromethanesulfonate. The yields, TONs, TOFs and endo:exo ratios were calculated. The optimal catalyst concentration was found in order to obtain the mixture of endo, exo isomers with the highest yields. Moreover recycling of the catalytic system consisting of Mg(OTf)2 (2 mol%) and ionic liquid was performed. The distillation was noticed to be a better product removal method than extraction by organic solvent, taking into consideration both the TON and TOF values.
Źródło:
Polish Journal of Chemical Technology; 2010, 12, 3; 3-5
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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