Results 151 to 160 of about 2,735 (188)
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Chemischer Informationsdienst, 1982
AbstractDie aus dem Diester (Ia) und einem großen Überschuß Natronlauge erhaltene Dicarbonsäure (Ib) wird in das Anhydrid (II) umgewandelt, dessen Ethanolyse zu den Estern (III) führt.
M. KAJTAR +3 more
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AbstractDie aus dem Diester (Ia) und einem großen Überschuß Natronlauge erhaltene Dicarbonsäure (Ib) wird in das Anhydrid (II) umgewandelt, dessen Ethanolyse zu den Estern (III) führt.
M. KAJTAR +3 more
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Journal of Chemical & Engineering Data, 2004
Experimental densities, ρ, viscosities, η, speeds of sound, υ, and relative permittivities, er, for three binary mixtures of water + 2-pyrrolidinone, + 1-methyl-2-pyrrolidinone, and + 1-vinyl-2-pyrrolidinone were measured over the entire composition range and at different temperatures.
John George, Nandhibatla V. Sastry
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Experimental densities, ρ, viscosities, η, speeds of sound, υ, and relative permittivities, er, for three binary mixtures of water + 2-pyrrolidinone, + 1-methyl-2-pyrrolidinone, and + 1-vinyl-2-pyrrolidinone were measured over the entire composition range and at different temperatures.
John George, Nandhibatla V. Sastry
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Journal of Labelled Compounds and Radiopharmaceuticals, 1985
AbstractAn efficient synthesis of 2‐pyrrolidinone and N‐methyl‐2‐pyrrolidinone was developed in which the compounds can be labeled with tritium at either the 3‐ and 4‐positions or the 4‐position of the lactam ring. Cyclization of [2,3‐3H]‐γ‐aminobutyric acid (GABA) yielded [3,4‐3H]‐2‐pyrrolidinone and cyclization of [3‐3H]‐GABA, prepared by acid ...
David A. Wells +2 more
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AbstractAn efficient synthesis of 2‐pyrrolidinone and N‐methyl‐2‐pyrrolidinone was developed in which the compounds can be labeled with tritium at either the 3‐ and 4‐positions or the 4‐position of the lactam ring. Cyclization of [2,3‐3H]‐γ‐aminobutyric acid (GABA) yielded [3,4‐3H]‐2‐pyrrolidinone and cyclization of [3‐3H]‐GABA, prepared by acid ...
David A. Wells +2 more
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Synthesis and reactions of 3‐pyrrolidinones
Journal of Heterocyclic Chemistry, 2008Abstractmagnified imageThis review presents a survey of the synthetic methods and reactions of 3‐pyrrolidinonesI(R = H, alkyl, acyl, ester; R1= H, alkyl, cyano, ester, etc). 3‐Pyrrolidinones are synthetically versatiles substrate, as they can be used for synthesis of a large variety of heterocyclic compounds, such as indoles and 5‐deazapteroic acid ...
Fathy Abdel‐Kader Amer +3 more
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ChemInform, 2000
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Franco Ghelfi +4 more
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AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Franco Ghelfi +4 more
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Journal of Physical Organic Chemistry, 1989
Abstract1H, 13C, 15N and 17O NMR chemical shifts, 1JNH and 1JCH coupling constants and line widths (Δν1/2) of the 14N and 17O resonance lines were determined for 2‐pyrrolidinone neat and for several 2‐pyrrolidinone–solvent systems. The 17O NMR chemical shift of 2‐pyrrolidinone was clearly most sensitive to the solvent effects, but changes with the ...
P. Ruostesuo +2 more
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Abstract1H, 13C, 15N and 17O NMR chemical shifts, 1JNH and 1JCH coupling constants and line widths (Δν1/2) of the 14N and 17O resonance lines were determined for 2‐pyrrolidinone neat and for several 2‐pyrrolidinone–solvent systems. The 17O NMR chemical shift of 2‐pyrrolidinone was clearly most sensitive to the solvent effects, but changes with the ...
P. Ruostesuo +2 more
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Atmospheric chemistry of 1-methyl-2-pyrrolidinone
Atmospheric Environment, 1999Rate constants for the atmospheric reactions of 1-methyl-2-pyrrolidinone with OH radicals, NO3 radicals and O3 have been measured at 296±2 K and atmospheric pressure of air, and the products of the OH radical and NO3 radical reactions investigated. Using relative rate techniques, rate constants for the gas-phase reactions of OH and NO3 radicals with 1 ...
Sara M. Aschmann, Roger Atkinson
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Recent development in 2‐pyrrolidinone‐containing nootropics
Drug Development Research, 1989AbstractThis paper reviews the development of the concept of nootropics‐‐compounds whose activity appears to be specific to enhancement and protection of those functions of plasticity of the central nervous system that we now call cognition. The rest of the review focuses on clinical and preclinical results reported on 2‐pyrrolidinone‐containing ...
Elkan Gamzu +3 more
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Synthetic Approaches to 2-Pyrrolidinone-5-carboxaldehyde
Synthetic Communications, 1996Abstract We have examined routes for the preparation of 2-pyrrolidinone-5S-carboxaldehyde which include oxidation of 5-hydroxymethyl-2-pyrrolidinone and reduction of 5-oxoproline ethyl ester. Only the oxidation route proved satisfactory. Moffatt oxidation was most efficient but PCC oxidation gave modest yields of the desired aldehyde.
Jeffrey Deskus +2 more
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