Bifunctional Acid-Base Ionic Liquid Organocatalysts with a Controlled Distance Between Acid and Base Sites

2010 ◽  
Vol 16 (4) ◽  
pp. 1221-1231 ◽  
Author(s):  
Mercedes Boronat ◽  
Maria J. Climent ◽  
Avelino Corma ◽  
Sara Iborra ◽  
Raquel Montón ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Acid Base ◽  
Acid And Base

scholarly journals Lewis acid / Base-free Strategy for the Synthesis of 2-Arylthio and Selenyl Benzothiazole / Thiazole and Imidazole

2021 ◽  
Vol 27 (1) ◽  
pp. 17-23
Author(s):  
Guniganti Balakishan ◽  
Gullapalli Kumaraswamy ◽  
Vykunthapu Narayanarao ◽  
Pagilla Shankaraiah
Keyword(s):  
Lewis Acid ◽  
Bond Formation ◽  
Acid Base ◽  
Mechanistic Pathway ◽  
Wide Range ◽  
Acid And Base ◽  
Lewis Acid And Base ◽  
Sulfur Bond

Abstract A Cu(II)-catalyzed Csp2-Se and Csp2-Sulfur bond formation was achieved with moderate to good yields without the aid of Lewis acid and base. The reaction is compatible with a wide range of heterocycles such as benzothiazole, thiazole, and imidazole. Also, this typical protocol is found to be active in thio-selenation via S-H activation. Additionally, we proposed a plausible mechanistic pathway involving Cu(III) putative intermediate.

One-pot synthesis of furfural derivatives from pentoses using solid acid and base catalysts

2014 ◽  
Vol 4 (4) ◽  
pp. 971-978 ◽  
Author(s):  
Mahiro Shirotori ◽  
Shun Nishimura ◽  
Kohki Ebitani
Keyword(s):  
Solid Acid ◽  
Acid Base ◽  
One Pot ◽  
Amberlyst 15 ◽  
Base Catalysts ◽  
One Pot Synthesis ◽  
Combined Use ◽  
Acid And Base

One-pot synthesis of (2-furanylmethylene)malononitrile, a Knoevenagel product of furfural with malononitrile, from xylose efficiently proceeded by combined use of acid Amberlyst-15 and acid-base Cr/hydrotalcites in 44% yield.

Incorporation of linear poly(ionic liquid)s inside acid-base dualistic carbons for CO2 cycloaddition reaction

2021 ◽  
Vol 52 ◽  
pp. 101702
Author(s):  
Nanhua Wu ◽  
Yifeng Zou ◽  
Rong Xu ◽  
Jing Zhong ◽  
Jing Li
Keyword(s):  
Ionic Liquid ◽  
Cycloaddition Reaction ◽  
Acid Base ◽  
Linear Poly ◽  
Poly Ionic Liquid

scholarly journals Inventarisasi Tanaman Berpotensi Sebagai Indikator Asam-Basa Alami Di Kota Kupang

bionature ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Nur R. Adawiyah Mahmud ◽  
Ihwan Ihwan ◽  
Nur Jannah
Keyword(s):  
Color Change ◽  
Curcuma Longa ◽  
Piper Betle ◽  
Acid Base ◽  
Sesbania Grandiflora ◽  
Base Solution ◽  
Synthetic Indicator ◽  
Acid Base Titration ◽  
Acid And Base ◽  
Bougainvillea Spectabilis

Abstract.  This study investigated a natural acid-base indicator which is extracted from plants in Kupang city. There are 14 plants that potential as a source of natural indicator for acid base titration, i.e, Kol Ungu (Brassica oleracea Capitata Group), Turi Merah flower (Sesbania grandiflora L. Pers), Belimbing Wuluh flower (Averhoa bilimbi L), Kaktus Merah fruit (Opuntia vulgaris Mill), Ruelia flower (Ruellia simplex), Flamboyan flower (Delonix regia), bugenvil flower (Bougainvillea spectabilis Willd.), Bayam Merah leaves (Amaranthus tricolor L.) Jamblang fruit (Syzygium cumini L.), Murbey fruit (Morus alba L.), Pinang fruit (Areca catechu L.), Sirih fruit (Piper betle L.), Kunyit (Curcuma longa Linn), and Nanas Kerang leaves (Rhoeo discolor). Plants extract shows a sharp color change in acid and base solution. Promising results as a natural indicator also shown in acid base titration which is have similar equivalent point to synthetic indicator. We can use these natural indicators as an alternative to synthetic indicator because they are found to be simple, very useful, cheap, easy to extract, accurate, and eco-friendly. Keywords: Plant, Natural indicator, Acid-Base

scholarly journals Crystal engineered acid-base complexes with 2d and 3d hydrogen bonding systems using p-hydroxybenzoic acid as the building block

2010 ◽  
Vol 75 (4) ◽  
pp. 459-473 ◽  
Author(s):  
Pu Zhao ◽  
Xian Wang ◽  
Fang Jian ◽  
Jun Zhang ◽  
Lian Xiao
Keyword(s):  
Self Assembly ◽  
Building Block ◽  
Three Dimensional ◽  
Hydroxybenzoic Acid ◽  
Acid Base ◽  
3D Network ◽  
Acid And Base ◽  
Butyl Amine ◽  
Bonding Systems ◽  
Simply Connected

p-Hydroxybenzoic acid (p-HOBA) was selected as the building block for self-assembly with five bases, i.e., diethylamine, tert-butyl amine, cyclohexylamine, imidazole and piperazine, and generate the corresponding acid-base complexes 1-5. Crystal structure analyses suggest that proton-transfer from the carboxyl hydrogen to the nitrogen atom of the bases can be observed in 1-4; while only in 5 does a solvent water molecule co-exists with p-HOBA and piperazine. With the presence of O-H?O hydrogen bonds in 1-4, the deprotonated p-hydroxybenzoate anions (p-HOBAA-) are simply connected each other in a head-to-tail motif to form one-dimensional (1D) arrays, which are further extended to distinct two-dimensional (2D) (for 1 and 4) and three-dimensional (3D) (for 2 and 3 ) networks via N-H?O interactions. While in 5, neutral acid and base are combined pair wise by O-H?N and N-H?O bonds to form a 1D tape and then the 1D tapes are sequentially combined by water molecules to create a 3D network. Some interlayer or intralayer C-H?O, C-H?? and ??? interactions help to stabilize the supramolecular buildings. Melting point determination analyses indicate that the five acidbase complexes are not the ordinary superposition of the reactants and they are more stable than the original reactants.

CO2 absorption properties of Brønsted acid–base ionic liquid composed of N,N-dimethylformamide and bis(trifluoromethanesulfonyl)amide

2010 ◽  
Vol 52 (2) ◽  
pp. 189-192 ◽  
Author(s):  
Daisuke Kodama ◽  
Mitsuhiro Kanakubo ◽  
Masaki Kokubo ◽  
Takeshi Ono ◽  
Hajime Kawanami ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Co2 Absorption ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Acid Base ◽  
Absorption Properties ◽  
Brönsted Acid

scholarly journals Extraction of Acids and Bases from Aqueous Phase to a Pseudoprotic Ionic Liquid

Molecules ◽  
2019 ◽  
Vol 24 (5) ◽  
pp. 894 ◽  
Author(s):  
Nikolas Patsos ◽  
Karin Lewis ◽  
Francesco Picchioni ◽  
Mark Kobrak
Keyword(s):  
Ionic Liquid ◽  
Aqueous Phase ◽  
Octanoic Acid ◽  
Organic Layer ◽  
Current Interest ◽  
Acid Base ◽  
Copper Salts ◽  
Hofmeister Effect ◽  
Wide Range ◽  
Acids And Bases

We report experiments on the extraction of acids and bases from an aqueous phase to a pseudoprotic ionic liquid phase consisting of an equimolar mixture of trihexylamine and octanoic acid. We observed the extraction of a wide range of acids and bases, and investigated the mechanism of extraction in detail. Our results confirmed the observation of the Hofmeister effect in these systems reported in our previous work, where the extent of the extraction of copper salts was significantly influenced by the interactions between extracted inorganic anions and the organic phase. Our results further demonstrated that the organic layer served as a “floating buffer” capable of stabilizing the pH of an acidic or alkaline aqueous phase. The results tie current interest in protic and pseudoprotic ionic liquids to earlier work on the extraction of acids using amine and acid–base couples as extraction agents in an inert organic solvent.

scholarly journals Energy Harvesting by Waste Acid/Base Neutralization via Bipolar Membrane Reverse Electrodialysis

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5510
Author(s):  
Andrea Zaffora ◽  
Andrea Culcasi ◽  
Luigi Gurreri ◽  
Alessandro Cosenza ◽  
Alessandro Tamburini ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Power Density ◽  
Operating Conditions ◽  
Alkaline Solutions ◽  
Bipolar Membrane ◽  
Acid Base ◽  
Reverse Electrodialysis ◽  
Acid And Base ◽  
Parasitic Currents ◽  
Added Salt

Bipolar Membrane Reverse Electrodialysis (BMRED) can be used to produce electricity exploiting acid-base neutralization, thus representing a valuable route in reusing waste streams. The present work investigates the performance of a lab-scale BMRED module under several operating conditions. By feeding the stack with 1 M HCl and NaOH streams, a maximum power density of ~17 W m−2 was obtained at 100 A m−2 with a 10-triplet stack with a flow velocity of 1 cm s−1, while an energy density of ~10 kWh m−3 acid could be extracted by a complete neutralization. Parasitic currents along feed and drain manifolds significantly affected the performance of the stack when equipped with a higher number of triplets. The apparent permselectivity at 1 M acid and base decreased from 93% with the five-triplet stack to 54% with the 38-triplet stack, which exhibited lower values (~35% less) of power density. An important role may be played also by the presence of NaCl in the acidic and alkaline solutions. With a low number of triplets, the added salt had almost negligible effects. However, with a higher number of triplets it led to a reduction of 23.4–45.7% in power density. The risk of membrane delamination is another aspect that can limit the process performance. However, overall, the present results highlight the high potential of BMRED systems as a productive way of neutralizing waste solutions for energy harvesting.

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