Fourier transform IR spectroscopy has been used to investigate the interaction of carbon dioxide with polymers. transmission and attenuated total reflectance spectra were obtained for CO2 impregnated into polymer films. It shown that polymers possessing electron-donating functional groups (e.g., carbonyl groups) exhibit specific interactions CO2, most probably Lewis acid−base nature. An unusual aspect is use bending mode (ν2) probe polymer−CO2 interactions. The evidence observation splitting...

Many industrial applications that rely on emulsions would benefit from an efficient, rapid method of breaking these at a specific desired stage. We report long-chain alkyl amidine compounds can be reversibly transformed into charged surfactants by exposure to atmosphere carbon dioxide, thereby stabilizing water/alkane or, for the purpose microsuspension polymerization, styrene-in-water emulsions. Bubbling nitrogen, argon, or air through amidinium bicarbonate solutions 65 degrees C reverses...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAsymmetric Hydrogenation and Catalyst Recycling Using Ionic Liquid Supercritical Carbon DioxideRichard A. Brown, Pamela Pollet, Erin McKoon, Charles Eckert, L. Liotta, Philip G. JessopView Author Information Department of Chemistry, University California Davis, 95616-5295 Schools Chemistry Chemical Engineering Georgia Institute Technology, Atlanta, 30332-0100 Cite this: J. Am. Chem. Soc. 2001, 123, 6, 1254–1255Publication Date (Web):January...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of naked anions. I. Reactions the 18-crown-6 complex potassium fluoride with organic substrates in aprotic solventsCharles L. Liotta and Henry P. HarrisCite this: J. Am. Chem. Soc. 1974, 96, 7, 2250–2252Publication Date (Print):April 1, 1974Publication History Published online1 May 2002Published inissue 1 April 1974https://pubs.acs.org/doi/10.1021/ja00814a044https://doi.org/10.1021/ja00814a044research-articleACS PublicationsRequest reuse...

This review highlights solvent systems that were designed to simultaneously address reaction, separation and recycling challenges.

Amidines have been reported to react with CO(2) form a stable and isolable zwitterionic adduct but previous studies were performed in the presence of at least some water. However, spectroscopy reaction between DBU detects rapid formation bicarbonate salt when wet is exposed does not indicate that an forms either or absence

Liquids that consist of a mixture an alcohol and either amidine or guanidine have been developed to switch from low-polarity form high-polarity ionic liquid upon treatment with CO2 at atmospheric pressure. Treatment N2 and/or mild heat (50−60 °C) reverses the process. These liquids can be used as switchable solvents dissolve then precipitate solute reagents for chemical synthesis product.

Bioethanol currently contributes ∼2% to the total US transportation fuels mix, and another ∼0.01% is based on biodiesel. To make a substantial contribution United States' energy portfolio, biofuels production needs grow substantially over next decade by factor of 10 or more. Although agro-energy crops agriculture waste for being intensively developed, potential forest products industry contribute this effort has been generally underestimated. The one few nationally industries that have...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and purification of 18-crown-6[1,4,7,10,13,16-hexaoxacyclooctadecane]George W. Gokel, Donald J. Cram, Charles L. Liotta, Henry P. Harris, Fred CookCite this: Org. Chem. 1974, 39, 16, 2445–2446Publication Date (Print):August 1, 1974Publication History Published online1 May 2002Published inissue 1 August 1974https://pubs.acs.org/doi/10.1021/jo00930a037https://doi.org/10.1021/jo00930a037research-articleACS PublicationsRequest reuse...

Phosphorylation of the nucleosides adenosine and uridine by simple mixing mild heating aqueous solutions organic compounds with synthetic analogs meteoritic mineral schreibersite, (Fe,Ni)3P under slightly basic conditions (pH ~9) is reported. These results suggest a potential role for phosphorus in origin development early life.

There are now available a variety of tunable solvents; these have been used extensively for extractions and in materials applications. Our focus has to apply techniques chemical reactions take advantage the special properties available, primarily sustainable technology, create processes that potentially more benign advantageous. We report here our work using supercritical fluids, near-critical gas-expanded liquids couple organic with separations. In this paper, we review applications...

Abstract The addition of cosolvents to supercritical fluid (SCF) solvents can have large effects on solubilities, giving engineers the ability tailor loadings and selectivities solutes for difficult separations. It is necessary a better understanding special intermolecular interactions that occur in SCF solutions predict cosolvents. We use chromatographic technique acquire database cosolvent variety solutes; examination shows evidence hydrogen bonding, charge transfer complex formation,...

Neoteric (new) solvents such as supercritical CO2 (scCO2), ionic liquids (ILs), ILs with cosolvents, and CO2-expanded (EILs) offer flexible physical properties, which allow chemists engineers to select the optimal solvent system for a specific reaction process. Homogeneously-catalyzed asymmetric hydrogenation of α,β-unsaturated carboxylic acids was chosen its economic interest multiple H2-concentration dependent behaviours. For example, ruthenium BINAP-type catalysts, type I substrates...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of naked anions. III. Reactions the 18-crown-6 complex potassium cyanide with organic substrates in aprotic solventsFred L. Cook, Chauncey W. Bowers, and C. LiottaCite this: J. Org. Chem. 1974, 39, 23, 3416–3418Publication Date (Print):November 1, 1974Publication History Published online1 May 2002Published inissue 1 November 1974https://pubs.acs.org/doi/10.1021/jo00937a026https://doi.org/10.1021/jo00937a026research-articleACS...

Switchable solvents are a unique class of that were developed to facilitate both reaction and subsequent product separation. Their "built-in" separation ability for facile recovery is paramount achieving chemical processes economically competitive environmentally conscious. Two classes switchable discussed: 1) piperylene sulfone—a volatile recycle DMSO substitute 2) one two-component reversible ionic liquids—solvent systems can be switched back forth between molecular liquids liquids.

A new class of one-component, thermally reversible, neutral to ionic liquid solvents derived from siloxylated amines is presented and characterized.