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Showing 1 to 20 of 46 for “"Anhydrides"”.
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Structure-property studies of conjugated 1,8-naphthalic anhydrides
The work in this thesis focuses on investigating the structure-property relationships of conjugated 1,8-naphthalic anhdyrides. Two series of compounds, substituted at the 3- and 4-position of the naphthalic core were designed and synthesized using a variety of aryl groups with different donor …
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The use of polymeric mixed anhydrides in peptide synthesis
This document only includes an excerpt of the corresponding thesis or dissertation. To request a digital scan of the full text, please contact the Ruth Lilly Medical Library's Interlibrary Loan Department (rlmlill@iu.edu).
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A Study of the Formation of Cyclic Anhydrides and Imides
Made available in DSpace on 2014-12-05T19:36:42Z (GMT). No. of bitstreams: 1 0023395.pdf: 8969081 bytes, checksum: ab3456fe89ce23282a8f8d4f2d19f6ca (MD5) Previous issue date: 1957
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Studies of metaphosphate acids and metaphosphate anhydrides in aprotic media
… of the metaphosphate ring allows. Metaphosphate anhydrides result from the dehydration of metaphosphate acids. They can undergo hydrolysis to regenerate metaphosphate acids, or alternatively alcoholysis to generate metaphosphate esters. Alcoholysis of metaphosphiate anhydrides presents a novel …
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The condensation of citraconic and maleic anhydrides with chloroprene and ethoxyprene
Thesis (B.S.) Massachusetts Institute of Technology. Dept. of Chemistry, 1948.
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Sulfur Rich Transition Metal-Main Group Heterocycles and Cages
… observed for the organoperthiophosphinic acid anhydrides, R(,2)P(,2)S(,4), 1. These anhydrides are one of the most efficient reagents known for the thiation of organic carbonyl compounds.
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Correlation of physical and chemical properties of anhydride-cured epoxy resins with theoretical structure
The structure of alicyclic dicarboxylic anhydrides was found to have a significant effect on the final physical and chemical properties of a cured epoxidized novolac resin, and the final properties of a cured system can be predicted with reasonable accuracy from the theoretical structure. …
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Metal-free methodology for the preparation of ynones using potassium alkynyltrifluoroborates and its application to the synthesis of natural products
… salts and acyl chlorides or anhydrides has been developed. The one-pot reaction is advantageous in that it does not require exclusion of air or water, is operationally simple, has broad substrate scope, and proceeds rapidly under mild conditions in the presence of a Lewis …
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Approaches toward the enantioselective total synthesis of amarogentic
… on the enantioselective desymmetrisation of meso-anhydrides using titanium TADDOLates. 1,2,4,6-Tetrahydrophthalic anhydride was desymmetrised and chemoselectively reduced to give (3aR, 7aS)-3a,4,7,7a-Tetrahydro-3H-isobenzofuran-1-one. Further development of this route was performed on a racemic …
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Applications of planar-chiral phosphaferrocene-oxazolines in asymmetric catalysis and enantioselective desymmetrization by carbon nucleophiles in the presence of chiral ligands
… the enantioselective desymmetrization of cyclic anhydrides and imides by carbon nucleophiles is described. By employing a Grignard reagent/chiral ligand complex as the nucleophile, a range of anhydrides and imides are effectively desymmetrized with uniformly high enantiomeric excess. In these …
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Chemoselective and Stereoselective Exploration of the Chemical Reactivity Space of Castagnoli-Cushman-Derived Allylic Lactamoyl Esters: Application to the Synthesis of Aza-Polycyclic Architectures
… <em>N</em>-iodoarylated-1,3-azadiene and cyclic anhydrides, followed by interception of the cycloadducts in cross-coupling manifolds (<em>e.g.</em>, Sonogashira coupling) and concomitant lithiation-cyclization of the tethered alkyne. An unprecedented example of a hydroamino alkylation that is …
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Intra- and intermolecular reactivity of organic diacyl systems
… carboxyamides from mixed phosphoric-carboxylic anhydrides (RO(R¹R²N)P(O)OC(O)R³; R = R¹ = alkyl; R² = H, alkyl, aryl; R³ = alkyl, aryl) was elucidated from structure reactivity studies using a model system, R = R¹ = R² = Me, R³ = Ph. Kinetic data was obtained using ¹H nmr spectroscopy; MNDO …
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SÍNTESE DE NOVOS POTENCIAIS ANTAGONISTAS DO NMDA SUBTIPO NR2B DO SISTEMA NERVOSO CENTRAL BASEADOS EM CARBOXAMIDAS TRIAZÓLICAS
… from the acylations with chlorides acids and anhydrides, the preparation of the intermediate 2- chlorine-N-(5-trifluoromethyl-2H-[1,2,4]triazole-3-yl)-acetamide (1) it was made by reaction of 2 with the chloroacetic acid in solid phase.
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Development and Mechanistic Investigation of the Palladium-Catalyzed Alpha-Arylation of Aldehydes and N-Arylation of Ammonia
… and chlorides, ammonia, and acid chlorides or anhydrides. Mechanistic studies showed that reactions conducted with the combination of CyPF t-Bu and Pd[P(o-tol)3]2 as catalyst occur with faster rates and higher yields than those conducted with CyPF-t-Bu and palladiun(II) as catalyst precursors.
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Binding, activation, and transformation of carbon dioxide mediated by anionic metal complexes
… typical dehydrating reagents, e.g organic acid anhydrides, is shown to proceed cleanly when cobaltocene, acting as an in situ reductant, is present to form the vanadium(IV) isocyanate complex (OCN)V(N['Bu]Ar) 3. The synthesis and structure of the bimetallic complex (TPP)MnOC(O)NV(N['Bu]Ar) 3 …
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The preparation of racemic and optically active beta-amino-acids and their utilisation in peptide formation.
… (eg. B-aminobutyric acid) yield only symmetrical anhydrides. However, in this work oxazinones of both racemic and optically active B-aminobutyric acid were isolated, charaterised, and used as peptide coupling intermediates. A chiral oxazinone has thus been isolated for the first time, and used as …
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Desymmetrilizing Organic Molecules via Structural Functionalization
… desymmetrization of meso-glutaric anhydrides catalyzed by Ni2-Schiff bases, asymmetric amination of selected prochiral ketones, selective diester hydrolysis, selective oxidation of diols and triol, etc. This master thesis will be mainly focused mono hydrolysis of diesters and mono …
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Isocyanate-derived organic aerogels: polyurethanes, polyureas, polyamides and polyimides
… (c) carboxylic acids (polyamides); and, (d) acid anhydrides (polyimides). All processes are invariably single-step, one-pot and take place at room temperature or slightly elevated temperatures. The resulting materials are robust, they have very wide range of densities and their nanomorphologies …
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