Solvent-free synthesis of unsaturated ketones by the Saucy–Marbet reaction using simple ammonium ionic liquid as a catalyst

Wang, Congmin; Zhao, Wenjia; Li, Haoran; Guo, Liping

doi:10.1039/b900042a

Cited by 63 publications

(35 citation statements)

References 45 publications

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“…Wang et al screened various ionic liquids for SaucyMarbet reaction between unsaturated alcohols and unsaturated ethers leading to corresponding unsaturated ketones [94] [96].…”

Section: As Acid Catalystsmentioning

confidence: 99%

Ionic Liquids: Synthesis and Applications in Catalysis

Rajni

2014

Advances in Chemistry

217

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Ionic liquids have emerged as an environmentally friendly alternative to the volatile organic solvents. Being designer solvents, they can be modulated to suit the reaction conditions, therefore earning the name "task specific ionic liquids. " Though primarily used as solvents, they are now finding applications in various fields like catalysis, electrochemistry, spectroscopy, and material science to mention a few. The present review is aimed at exploring the applications of ionic liquids in catalysis as acid, base, and organocatalysts and as soluble supports for catalysts.

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“…Wang et al screened various ionic liquids for SaucyMarbet reaction between unsaturated alcohols and unsaturated ethers leading to corresponding unsaturated ketones [94] [96].…”

Section: As Acid Catalystsmentioning

confidence: 99%

Ionic Liquids: Synthesis and Applications in Catalysis

Rajni

2014

Advances in Chemistry

217

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“…Accordingly, new materials that can capture CO 2 from the burning of fossil fuels efficiently, economically, and with potential energy savings must be developed. [4] A great deal of effort has focused on the experimental and theoretical studies on the physical absorption of CO 2 in ILs. [1] However, this process for the capture of CO 2 is highly energy intensive owing to the thermodynamic properties of water and high enthalpy of absorption.…”

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confidence: 99%

Tuning the Basicity of Ionic Liquids for Equimolar CO₂ Capture

et al. 2011

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The emission of carbon dioxide (CO 2 ) from fossil fuels has received worldwide attention because it has been implicated in climate change, which threatens economies and environments. Accordingly, new materials that can capture CO 2 from the burning of fossil fuels efficiently, economically, and with potential energy savings must be developed. The traditional technology for the capture of CO 2 in industry is chemical adsorption by an aqueous solution of amine, which has some advantages, such as low cost, good reactivity, and high capacity.[1] However, this process for the capture of CO 2 is highly energy intensive owing to the thermodynamic properties of water and high enthalpy of absorption.[2] It is estimated that the output of energy would drop by about 30 % when this capture technology was applied at coal-fired power plants, which significantly increases the cost of energy.[3] Currently, the goal is to design industrial attractive sorbent materials with high capacity and energy-saving for CO 2 capture.Ionic liquids (ILs) offer a new opportunity for addressing this challenge to develop novel CO 2 capture systems because of their unique properties, including negligible vapor pressures, high thermal stabilities, and tunable properties.[4] A great deal of effort has focused on the experimental and theoretical studies on the physical absorption of CO 2 in ILs.[5]The enthalpy of CO 2 physical absorption by ILs is about 20 kJ mol À1 , indicating that only a quarter energy is required to release the physical absorbed CO 2 from ILs in the regeneration step relative to amine solution method.[6] However, the absorption capacity of CO 2 by these ILs is up to about 3 mol % under atmospheric pressure. Another strategy is based on the chemisorption for CO 2 capture by task-specific ILs. Davis and co-workers [7] reported the first example of CO 2 chemisorption that employs an amino-functionalized IL; in their work, 0.5 mol CO 2 was captured per mole of IL under ambient pressure. Subsequently, some other amino-functionalized ILs, including sulfone anions with ammonium cations and amino acid anions with imidazolium or phosphonium cations, were reported for the capture of CO 2 .[8] Recently, a novel method for the capture of CO 2 in a 1:1 manner by superbase-derived protic ILs and substituted aprotic ILs using the reactivity of anion was reported.[9] Normally, the chemisorption has high absorption capacity for CO 2 along with high energy requirement for regeneration.[10] One commonly used parameter to access the regeneration energy requirement is the enthalpy of CO 2 absorption. We need reduce the enthalpy of absorption to design the energy-saving ILs for CO 2 capture. Then, how can we design suitable chemical structures of ILs to reduce the enthalpy of CO 2 chemisorption? Can we prepare highly stable ILs for energy-saving and equimolar CO 2 capture?Herein, we present a strategy to tune the enthalpy of CO 2 absorption by tunable basic ionic liquids, which were prepared by neutralizing weak proton donors with different pK a valu...

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“…Furthermore, ILs are considered as "green solvents" due to their non-volatile nature with an added advantage of tuning their physical and chemical properties by suitable selection of cation, anion, and substituent. Recently, the ammonium based IL has emerged as a better alternative to imidazolium based ILs in separation process due to their salient feature such as low cost, easy synthesis procedure and less toxicity [33]. In the present work, a new ammonium based DIL was synthesized in our lab and further it employed for application of CPE of PA.…”

Section: Introductionmentioning

confidence: 98%