A new natural based ionic liquid 3-sulfonic acid 1-imidazolopyridinium hydrogen sulfate as an efficient catalyst for the preparation of 2H-indazolo[2,1-b]phthalazine-1,6,11(13H)-triones

2015 ◽  
Vol 206 ◽  
pp. 119-128 ◽  
Author(s):  
Reza Tayebee ◽  
Malihe Jomei ◽  
Behrooz Maleki ◽  
Maryam Kargar Razi ◽  
Hojat Veisi ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Sulfonic Acid ◽  
Hydrogen Sulfate ◽  
Efficient Catalyst

scholarly journals Biodiesel fromCitrullus colocynthisOil: Sulfonic-Ionic Liquid-Catalyzed Esterification of a Two-Step Process

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Yasir Ali Elsheikh ◽  
Faheem Hassan Akhtar
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Sulfonic Acid ◽  
Molar Ratio ◽  
Disulfonic Acid ◽  
Hydrogen Sulfate ◽  
Citrullus Colocynthis ◽  
Step Process ◽  
Acidic Catalyst ◽  
Acidic Catalysts

Biodiesel was prepared fromCitrullus colocynthisoil (CCO) via a two-step process. The first esterification step was explored in two ionic liquids (ILs) with 1,3-disulfonic acid imidazolium hydrogen sulfate (DSIMHSO4) and 3-methyl-1-sulfonic acid imidazolium hydrogen sulfate (MSIMHSO4). Both ILs appeared to be good candidates to replace hazardous acidic catalyst due to their exceptional properties. However, the two sulfonic chains existing in DSIMHSO4were found to increase the acidity to the IL than the single sulfonic chain in MSIMHSO4. Based on the results, 3.6 wt% of DSIMHSO4, methanol/CCO molar ratio of 12 : 1, and 150°C offered a final FFA conversion of 95.4% within 105 min. A 98.2% was produced via second KOH-catalyzed step in 1.0%, 6 : 1 molar ratio, 600 rpm, and 60°C for 50 min. This new two-step catalyzed process could solve the corrosion and environmental problems associated with the current acidic catalysts.

Silica Gel Supported Dual Acidic Ionic Liquid as a Recyclable and Efficient Catalyst for Esterification and Acetalization Reactions

2011 ◽  
Vol 233-235 ◽  
pp. 1336-1339 ◽  
Author(s):  
Qiang Zhang ◽  
Hong Su ◽  
Jun Luo
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Silica Gel ◽  
Covalent Bond ◽  
High Catalytic Activity ◽  
The Novel ◽  
Hydrogen Sulfate ◽  
Efficient Catalyst ◽  
Acidic Ionic Liquid

A supported dual acidic ionic liquid was prepared via anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto common silica gel by covalent bond. The novel immobilized acidic ionic liquid illustrated high catalytic activity in esterification and acetalization reactions. The products could be separated by simple decantation and the recovered catalyst could be recycled without remarkable loss of catalytic activity even after eight runs for esterification and six runs for acetalization.

scholarly journals Triazine bis(pyridinium) hydrogen sulfate ionic liquid immobillized on functionalized halloysite nanotubes as an efficient catalyst for one-pot synthesis of naphthopyranopyrimidines

RSC Advances ◽  
2021 ◽  
Vol 11 (20) ◽  
pp. 11976-11983
Author(s):  
Marzieh Samadani ◽  
Beheshteh Asadi ◽  
Iraj Mohammadpoor-Baltork ◽  
Valiollah Mirkhani ◽  
Shahram Tangestaninejad ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Halloysite Nanotubes ◽  
Reusable Catalyst ◽  
Hydrogen Sulfate ◽  
One Pot ◽  
Efficient Catalyst ◽  
One Pot Synthesis ◽  
Novel Method

A novel method for synthesis of naphthopyranopyrimidines, using [(PATDBP)(HSO4)2@HNT] as a green and reusable catalyst is reported.

Morpholinium hydrogen sulfate (MHS) ionic liquid as an efficient catalyst for the synthesis of bio-active multi-substituted imidazoles (MSI) under solvent-free conditions

2017 ◽  
Vol 72 (1) ◽  
pp. 23-33 ◽  
Author(s):  
Adel A. Marzouk ◽  
Antar A. Abdelhamid ◽  
Shaaban K. Mohamed ◽  
Jim Simpson
Keyword(s):  
Ionic Liquid ◽  
Reaction Times ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Biologically Active ◽  
High Yield ◽  
Hydrogen Sulfate ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Very High

AbstractMorpholinium hydrogen sulfate as an ionic liquid was employed as a catalyst for the synthesis of a biologically active series of multi-substituted imidazoles by a four-component reaction involving the combination of benzil with different aromatic aldehydes, ammonium acetate, and 1-amino-2-propanol under solvent-free conditions. The key advantages of this method are shorter reaction times, very high yield, and ease of processing. Furthermore, the resulting products can be purified by a non-chromatographic method and the ionic liquid catalyst is reusable. All of these novel compounds have been fully characterized from spectral data. The X-ray crystal structures of two representative molecules are also detailed.

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