Design and synthesis of basic ionic liquids for the esterification of triterpenic acids

Ressmann, Anna K.; Schneider, María Gabriela Montiel; Gärtner, Peter; Weil, Mat­thias; Bica, Katharina

doi:10.1007/s00706-016-1889-1

Cited by 10 publications

(5 citation statements)

References 32 publications

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“…In general, Brønsted basic ionic liquids contain at least one Brønsted basic group either on the cation or on the anion . Basic ionic liquids can be used as an alternative to commonly used (in) organic bases, and several applications in organic reactions such as esterifications, Michael additions or Aldol reactions have been reported. Non‐volatile organic salts with amine functionalities were also used to immobilize transition metal catalysts, for example palladium species or, more recently well‐defined ruthenium catalysts that have been employed for the elegant continuous flow hydrogenation of carbon dioxide to formic acid …”

Section: Resultsmentioning

confidence: 99%

Selective Hydrogenation of Aldehydes Using a Well‐Defined Fe(II) PNP Pincer Complex in Biphasic Medium

et al. 2018

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A biphasic process for the hydrogenation of aldehydes was developed using a well‐defined iron (II) PNP pincer complex as model system to investigate the performance of various ionic liquids. A number of suitable hydrophobic ionic liquids based on the N(Tf)2 − anion were identified, allowing to immobilize the iron (II) catalyst in the ionic liquid layer and to facilitate the separation of the desired alcohols. Further studies showed that targeted Brønsted basic ionic liquids can eliminate the need of an external base to activate the catalyst.

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Section: Resultsmentioning

confidence: 99%

Selective Hydrogenation of Aldehydes Using a Well‐Defined Fe(II) PNP Pincer Complex in Biphasic Medium

et al. 2018

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“…All of the studied ADILs have Cl - as an anion so, the performance activity related directly to the alkyl spacer aliphatic chain length between the two aromatic rings in the cation structure and the effect of moiety. It is well known that aromatic based ILs have high performance activity consequentially, imidazolium cations possessed high activity and acidity 33 because of the effect of acidic hydrogen connected between the nitrogen atoms in the imidazolium ring. The presence of a pyridinium ring in the cation structure increases the aromaticity.…”

Section: Resultsmentioning

confidence: 99%

Dicationic ionic liquids (DILs) as rapid esterification catalyst of butyric fatty acid

El-Nagar

2023

Sci Rep

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In the presented work, a series of asymmetric dicationic ionic liquids (ADILs) with different alkyl chain length spacer between the two cation nuclei (imidazolium and pyridinium) with chlorine halide anion was designed, synthesized with excellent yield (89, 90 and 88%) and well characterized via different tools of analysis (FT-IR and 1H-NMR spectroscopy and thermal gravimetric analysis; TGA). The synthesized ADILs were examined for potential esterification as recyclable catalysts including the activity of catalytic performance, the reaction conditions justifying. The noted resulted data indicated that the butyric acid was converted perfectly into ester in presence of ADILs with short time of reaction. By completing our studies through the effect of chemical structures, concentrations, time and temperatures, we found that the synthesized Py-6-Imi exhibit the best catalytic performance with 96% as conversion value after 20 min at the ambient temperature (25 °C). The synthesized ADILs also recovered and reused for minimum three rounds without any significant reduction in the catalytic performance. Totally, the usage of ADILs in the esterification process offers lots of benefits such as perfect yield, quick time and environmentally friendly characteristics which make them the optimum sustainable compounds to be achieved in variety of industrial applications.

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“…Compared with the frequently used inorganic bases in aldol condensation, the DBU avoided metal-salt wastes and was treated harmlessly. In addition, the probable generated ionic liquid by the combination of DCE and DBU may accelerate the reaction by increasing the solubility of substrates . The concrete work is going on in our group.…”

Section: Resultsmentioning

confidence: 99%

Visible-Light-Induced Decarboxylation Coupling/Intramolecular Cyclization: A One-Pot Synthesis for 4-Aryl-2-quinolinone Derivatives

et al. 2018

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A visible-light-induced decarboxylation coupling/intramolecular cyclization is reported. The one-pot synthesis system provides mild, efficient, and atom economical access to the synthesis of 4-aryl-2-quinolinone derivatives. It is notable that the necessary oxidant in the traditional decarboxylation coupling is replaced by the visible-light irradiation in this paper. In addition, the HBV inhibitor is synthesized by the one-pot synthesis system in an atom economical manner.

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Design and synthesis of basic ionic liquids for the esterification of triterpenic acids

Cited by 10 publications

References 32 publications

Selective Hydrogenation of Aldehydes Using a Well‐Defined Fe(II) PNP Pincer Complex in Biphasic Medium

Selective Hydrogenation of Aldehydes Using a Well‐Defined Fe(II) PNP Pincer Complex in Biphasic Medium

Dicationic ionic liquids (DILs) as rapid esterification catalyst of butyric fatty acid

Visible-Light-Induced Decarboxylation Coupling/Intramolecular Cyclization: A One-Pot Synthesis for 4-Aryl-2-quinolinone Derivatives

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