Superbase
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Reduction of Carbon Dioxide to Formate at Low Overpotential Using a Superbase Ionic Liquid Open
A new low‐energy pathway is reported for the electrochemical reduction of CO 2 to formate and syngas at low overpotentials, utilizing a reactive ionic liquid as the solvent. The superbasic tetraalkyl phosphonium ionic liquid [P 66614 ][124…
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Recycling of Superbase-Based Ionic Liquid Solvents for the Production of Textile-Grade Regenerated Cellulose Fibers in the Lyocell Process Open
This article has a correction concerning the authors: We regret that there is an error with the author list in our original article. The authors Jussi Helminen, Paulus Hyväri, and Ilkka Kilpeläinen, all with the Department of Chemistry, Un…
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CO<sub>2</sub> Chemisorption Behavior in Conjugated Carbanion-Derived Ionic Liquids via Carboxylic Acid Formation Open
Superbase-derived task-specific ionic liquids (STSILs) represent one of the most attractive and extensively studied systems in carbon capture via chemisorption, in which the obtained CO2 uptake capacity has a strong relationship with the b…
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Superbase-based protic ionic liquids for cellulose filament spinning Open
Lyocell fibers have received increased attention during the recent years. This is due to their high potential to satisfy the rising market demand for cellulose-based textiles in a sustainable way. Typically, this technology adopts a dry-je…
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Superbase ionic liquids for effective cellulose processing from dissolution to carbonisation Open
Strong cellulose fibres and highly ordered carbon fibres can be produced from solutions in superbase ionic liquids.
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Organocatalyzed Trifluoromethylation of Ketones and Sulfonyl Fluorides by Fluoroform under a Superbase System Open
Fluoroform (HCF 3 , HFC‐23) is a side product in the manufacture of polytetrafluoroethylene (Teflon). Despite its attractive properties, taming HCF 3 for trifluoromethylation is quite problematic owing to its low acidity and the lability o…
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Sustainable Approach for Cellulose Aerogel Preparation from the DBU–CO<sub>2</sub> Switchable Solvent Open
We report a sustainable and easy approach for the preparation of cellulose-based aerogels from the DBU–CO2 switchable solvent system via a solubilization and coagulation approach followed by freeze-drying. The easy, fast, and mild solubili…
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Cyclopropenimine Superbases: Competitive Initiation Processes in Lactide Polymerization Open
Cyclopropenimine superbases were employed to catalyze the ring-opening polymerization of lactide. Polymerization occurred readily in the presence and absence of alcohol initiators. Polymerizations in the absence of alcohol initiators revea…
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Confinement of poly(allylamine) in Preyssler-type polyoxometalate and potassium ion framework for enhanced proton conductivity Open
Polyoxometalate based solids are promising candidates of proton-conducting solid electrolytes. In this work, a Preyssler-type polyoxometalate is crystallized with potassium ions and poly(allylamine), which is also a good proton conductor, …
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Photoinduced ring-opening polymerisation of <span>l</span>-lactide <i>via</i> a photocaged superbase Open
The phototriggered ring-opening polymerisation of l-lactide is demonstrated for the first time using a photocaged tetramethylguanidine.
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A practical method of liberating O-linked glycans from glycoproteins using hydroxylamine and an organic superbase Open
O-Linked glycan liberation from proteins through reductive beta-elimination and hydrazinolysis is widely used, but have yet to satisfy the recent needs for glycan analysis in glycan biomarker research and microheterogeneity evaluation of b…
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Study of Superbase-Based Deep Eutectic Solvents as the Catalyst in the Chemical Fixation of CO2 into Cyclic Carbonates under Mild Conditions Open
Superbases have shown high performance as catalysts in the chemical fixation of CO2 to epoxides. The proposed reaction mechanism typically assumes the formation of a superbase, the CO2 adduct as the intermediate, most likely because of the…
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Triazabicyclodecene: A versatile catalyst for polymer synthesis Open
This comprehensive review aims to provide an in‐depth analysis of the catalytic performance of 1,5,7‐triazabicyclo[4,4,0]dec‐5‐ene (TBD) in polymer synthesis. TBD, a well‐established organic superbase, possesses a distinctive bifunctional …
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One‐Pot Preparation of Dimethyl Isosorbide from <span>d</span>‐Sorbitol via Dimethyl Carbonate Chemistry Open
Direct synthesis of dimethyl isosorbide (DMI) from d ‐sorbitol via dimethyl carbonate (DMC) chemistry is herein first reported. High yield of DMI was achieved using the nitrogen superbase 1,5,7‐triazabicyclo[4.4.0]dec‐5‐ene (TBD) as cataly…
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Mechanistic insights into carbamate formation from CO<sub>2</sub>and amines: the role of guanidine–CO<sub>2</sub>adducts Open
This work explores the reactivity of a reversible superbase–CO 2 zwitterion, which can be used as a stoichiometric source of CO 2 .
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Superbase-Catalyzed Stereo- and Regioselective Glycosylation with 2-Nitroglycals: Facile Access to 2-Amino-2-deoxy-<i>O</i>-glycosides Open
An efficient superbase-catalyzed stereo- and regio-selective glycosylation of 2-nitroglycals with high functional group compatibility is reported. The ion pair generated from alcohol and a catalytic amount of P4-t-Bu was vital for the succes…
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Understanding the Competitive Gas Absorption of CO<sub>2</sub> and SO<sub>2</sub> in Superbase Ionic Liquids Open
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Tris(tetramethylguanidinyl)phosphine: The Simplest Non‐ionic Phosphorus Superbase and Strongly Donating Phosphine Ligand Open
We report the synthesis and properties of the much sought‐after tris(1,1,3,3‐tetramethylguanidinyl) phosphine P(tmg) 3 , a crystalline, superbasic phosphine accessible through a short and scalable procedure from the cheap and commercially …
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Effect of the Presence of MEA on the CO<sub>2</sub> Capture Ability of Superbase Ionic Liquids Open
The miscibility of monoethanolamine (MEA) in five superbase ionic liquids (ILs), namely the trihexyl-tetradecylphosphonium benzotriazolide ([P66614][Bentriz]), trihexyl-tetradecylphosphonium benzimidazolide ([P66614][Benzim]), trihexyl-tet…
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Endohedral Functionalized Cage as a Tool to Create Frustrated Lewis Pairs Open
A frustrated Lewis pair (FLP) system was obtained by confinement of the Lewis base partner, a Verkade's superbase, in a molecular cavity. Whereas the model superbase lacking cavity displayed no catalytic activity in Morita–Baylis–Hillman (…
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Hydrogen sulfide gas capture by organic superbase 1,8-diazabicyclo-[5.4.0]-undec-7-ene through salt formation: salt synthesis, characterization and application for CO<sub>2</sub>capture Open
The organic superbase DBU captured H2S gas by protonation of one of its nitrogen atoms where a liquid, colorless, molecular DBU turned to solid greenish salt, [DBU][SH].
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Bifunctional Iminophosphorane Catalyzed Enantioselective Ketimine Phospha-Mannich Reaction Open
The enantioselective phospha-Mannich reaction of diethyl phosphite to unactivated N-DPP-protected ketimines catalyzed by a bifunctional iminophosphorane (BIMP) superbase organocatalyst is described. The reaction is applicable to ketimines …
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Deciphering Siloxane Bond Exchanges: From a Molecular Study to Vitrimerization and Recycling of Silicone Elastomers Open
The activity of various additives promoting siloxane equilibration reactions is examined and quantified on model compounds. We found in particular that the “superbase” phosphazene derivative P 4 ‐ t Bu can promote very fast exchanges (a fe…
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Harnessing the Hybridization of a Metal‐Organic Framework and Superbase‐Derived Ionic Liquid for High‐Performance Direct Air Capture of CO<sub>2</sub> Open
Direct air capture (DAC) of CO 2 has emerged as the most promising “negative carbon emission” technologies. Despite being state‐of‐the‐art, sorbents deploying alkali hydroxides/amine solutions or amine‐modified materials still suffer from …
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The addition of CO<sub>2</sub>to four superbase ionic liquids: a DFT study Open
DFT studies of the addition of CO2to superbase ionic liquids show that strength of binding to the anion is correlated to experimental sorption capacity, but anion–cation cohesion with the ionic liquid is weakened by carbamate bond formatio…
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Evaluating the potential of a novel hardwood biomass using a superbase ionic liquid Open
Lignocellulosic biomass, being ubiquitous and easily accessible, bears a huge potential for sustainable energy and other products.
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Synergy of high permeability and selectivity of superbase/choline chloride/urea solution impregnated membranes for CO2 capture Open
A new generation of solvents called ternary deep eutectic solvents have emerged as a promising candidate to replace ionic liquids (IL) in CO2 capturing due to its inherent advantages of both, superbase and deep eutectic solvents (DES). In …
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Utilizing the Azaazulene Scaffolds in the Design of New Organic Superbases Open
New neutral organic superbases with 1-azaazulene(s) as a molecular backbone are computationally designed, employing two basic substituents: dimethylaminocyclopropen-imines (CPI) and dimethylaminocyclopropeniminophosphazenes (CPI-P). Their …
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Preparation of an ion with the highest calculated proton affinity: ortho-diethynylbenzene dianion Open
Owing to the increased proton affinity that results from additional negative charges, multiply-charged anions are shown as a route to preparing powerful ‘superbases’.
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Process Development for Flexible Films of Industrial Cellulose Pulp Using Superbase Ionic Liquids Open
Due to environmental concerns, more attention has been given to the development of bio-based materials for substitution of fossil-based ones. Moreover, paper use is essential in daily routine and several applications of industrial pulp can…