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Anhydrides (6):
Recent article
Anhydrides
Abstract
An efficient short protocol for the preparation of N-perfluoroacylated glycals of neuraminic acid, by simple short treatment of differently protected N-acetylneuraminic acid with perfluorinated anhydrides in acetonitrile at 135 degrees C, is reported, together with a rationalitazion of the reaction...
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PMID: 20559590
PDF is available here.
PDF is available here.
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Bioresource Technology (101)15 2010
Abstract
The work described in this paper demonstrated that acetylation of pine wood up to 16.4 weight percent gain has a positive effect on the compression strength. Higher modification levels resulted in a reduction of the compression strength of wood, compared to the untreated wood. A comprehensive invest...
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PMID: 20231093
PDF is available here.
PDF is available here.
Pharmaceutical Research (27)8 2010
Abstract
The thermosensitive micelles based on the poly(PEG:CPP:SA) terpolymer composed of poly(ethylene glycol) (PEG), 1,3-bis(carboxyphenoxy) propane (CPP) and sebacic acid (SA) were fabricated for application as a promising drug carrier.
The terpolymer can self-assemble int...
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PMID: 20428931
PDF is available here.
PDF is available here.
Journal of Antibiotics (63)7 2010
Abstract
Abstract
GC-MS analysis of fluorinated and non-fluorinated chloroformate and anhydride derivatives of amino acid (AA) enantiomers on two different chiral columns was compared for the direct quantification of free L- and D-AAs in human serum and urine in a single analytical run. Best sensitivity was achieved...
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PMID: 20371216
PDF is available here.
PDF is available here.
Nanotechnology (21)16 2010
Abstract
We use scanning tunneling microscopy to investigate the influence of molecular ratio on the self-assembly of PTCDA-melamine structures on Au(111)-(22 x complex square root of 3). Our observations reveal that three different chiral supramolecular networks having a PTCDA:melamine ratio of 3:2, 1:2, 1:...
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PMID: 20348601
PDF is available here.
PDF is available here.
Chemical Communications (46)15 2010
Abstract
We describe the efficient and highly enantioselective kinetic resolution of trans-cycloalkane-1,2-diols utilizing an enantioselective Steglich reaction with a variety of carboxylic acids that form the corresponding anhydrides in situ.
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PMID: 20461855
PDF is available here.
PDF is available here.
Abstract
2-Cyano-3,10-dioxooleana-1,9(11)-dien-28-oic acid anhydride (CDDO anhydride) has been synthesized, which is the first example of an oleanane triterpenoid anhydride. CDDO anhydride shows potency similar to or higher than the corresponding acid (CDDO) in various in vitro and in vivo assays related to...
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PMID: 20188548
PDF is available here.
PDF is available here.
Abstract
Optics Express (17)24 2009
Abstract
We present spectroscopic measurements on 3,4,9,10-perylenetetracarboxylic dianhydride molecules (PTCDA) at ambient conditions. Surface coverages as small as 1 per thousand of a compact monolayer still give rise to fluorescence spectra with a good signal to noise ratio. Moreover, we analyze and quant...
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PMID: 19997412
PDF is available here.
PDF is available here.
Molecular Diversity (13)3 2009
Abstract
Diimide-dicaboxylic acids derived from condensation of alpha-amino acids with the 2,3,5,6-bicyclo[2.2.2] oct-2-enetetracarboxylic-2,3:5,6-dianhydride or 1,2,4,5- bezenetetracarboxylic-1,2:4,5-dianhydride react with ninhydrin and isocyanides to produce some novel interesting bis-alpha-acyloxy-beta-di...
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PMID: 19219558
PDF is available here.
PDF is available here.
Abstract
The pi-conjugated organic molecules 3,4,9,10-perylene-tetracarboxylic dianhydride, 1,4,5,8-naphthalene-tetracarboxylic dianhydride, and 1,8-naphthalene-dicarboxylic anhydride were investigated via gas phase and bulk ultraviolet photoemission spectroscopy and compared to density functional theory cal...
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PMID: 19624225
PDF is available here.
PDF is available here.
Abstract
The reactions of 3,4,9,10-perylenetetracarboxylic dianhydride with 4,4'-diamino-p-terphenyl and with 2,4,6-tris(4-aminophenyl)-1,3,5-triazine on an Au(111) surface have been followed by low-temperature UHV-STM in the range of 300 to 700 K at coverages of up to one monolayer. Well-ordered, H-bonded s...
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PMID: 19209364
PDF is available here.
PDF is available here.
Abstract
A new and efficient desymmetrisation of succinic and glutaric cyclic meso-anhydrides is described, providing excellent yields and diastereoselectivities in most cases. Derivatisation of the desymmetrised products is demonstrated by their conversion into mono-protected 1,4-diols. General synthetic ut...
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PMID: 19194591
PDF is available here.
PDF is available here.
Abstract
Beta-hydroxy amides 6 and 7 were treated with triphenylphosphonium anhydride trifluoromethane sulfonate (3), or the cyclic analogue 4, to generate 2-oxazolines 5 and 8 under mild conditions. The reaction was optimised by examining the number of equivalents of reagents 3 or 4, or diisopropylethyl ami...
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PMID: 19194590
PDF is available here.
PDF is available here.
Abstract
Methods of synthesis of prostaglandin fluorides were developed and their properties were investigated. These compounds were shown to be convenient synthetic precursors for obtaining esters and amides of natural prostaglandins and their fluorodeoxy analogues.
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PMID: 19377530
PDF is available here.
PDF is available here.
Chemical Record (9)6 2009
Abstract
Various intermediates for the synthesis of erythronolide A, an aglycon of erythromycin A, are prepared from the corresponding seco-acids using 2-methyl-6-nitrobenzoic anhydride (MNBA) in the presence of 4-(dimethylamino)pyridine (DMAP) with or without triethylamine. The efficiency of...
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PMID: 20041452
PDF is available here.
PDF is available here.
Journal of Oleo Science (58)1 2009
Abstract
Oxidative cleavage of carbon-carbon double bonds of cyclic olefins with hydrogen peroxide in the presence of heteropolyacids has been investigated as a clean and environmentally friendly preparation of polycarboxylic acids. In the presence of 12-tungstophospholic acid (H(3)PW(12)O(40)), adipic acid...
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PMID: 19075506
PDF is available here.
PDF is available here.
Abstract
Abstract
A solvent-free approach is described for the regioselective synthesis of acylals (1,1-diacetates) in shorter reaction times and higher yields, compared to conventional methodology using solvents. In the protection reaction of the o-hydroxybenzaldehyde the formation of acetyl compounds and anhydro-di...
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PMID: 19924047
PDF is available here.
PDF is available here.
Abstract
Abstract
An intermolecular nickel-catalyzed addition reaction has been developed where phthalic anhydrides react with alkynes to afford substituted isocoumarins. A mechanistic rationale is proposed, implying reductive elimination of Ni(0) promoted by ZnCl(2) cocatalyst as the key step of the catalytic cycle....
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PMID: 19049285
PDF is available here.
PDF is available here.
Abstract
Microwave induced two-component coupling (2CC) reaction of carboxylic acids with isonitriles gives rise to various N-formylamides. The formimidate carboxylate mixed anhydride (FCMA) is proposed as the reactive intermediate, which undergoes 1,3-O-->N acyl transfer to give the observed product. The fo...
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PMID: 18783224
PDF is available here.
PDF is available here.
Abstract
We probed the hypothesis that polymeric particles conjugated with a ligand for VCAM-1 exhibit selective and avid adhesion to sites of atherosclerosis. Particles made from polystyrene or the biodegradable polymer poly(sebacic acid)-block-polyethylene glycol (PSA-PEG) were conjugated with an antibody...
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PMID: 18428114
PDF is available here.
PDF is available here.
Abstract
Self-assembly of the binary molecular system of pentacene and 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) on Ag(111) has been investigated by low-temperature scanning tunneling microscopy, molecular dynamics (MD), and density functional theory (DFT) calculations. Well-ordered two-dimensiona...
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PMID: 18722423
PDF is available here.
PDF is available here.
Abstract
Mechanisms for the recently described reactions of isonitriles with carboxylic acids (Li, X.; Danishefsky, S. J. J. Am. Chem. Soc. 2008, 130, 5446) are explored with the B3LYP density functional method. The mechanism involves the formation of a carboxylate mixed formimidic anhydride intermediate via...
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PMID: 18707109
PDF is available here.
PDF is available here.
Journal of Organic Chemistry (73)16 2008
Abstract
Bifunctional urea-based cinchona alkaloid derivatives have been shown to promote highly efficient DKR reactions of azalactones using an alcohol nucleophile. The optimum catalyst is remarkably insensitive to the steric bulk of the amino acid residue, allowing alanine-, methionine-, and phenylalanine-...
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PMID: 18646859
PDF is available here.
PDF is available here.
Abstract
A novel series of hetero-arylboroxines were synthesized and structurally characterized by X-ray diffraction, NMR and computational analysis. The solid-state structures of the hetero-arylboroxines represent the first report of AB(2)-type hetero-arylboroxines.
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PMID: 18629398
PDF is available here.
PDF is available here.
Abstract
An efficient direct one-pot glycosylation method with anomeric hydroxy sugars as glycosyl donors employing phthalic anhydride and triflic anhydride as activating agents has been developed. Thus, highly stereoselective beta-mannopyranosylations were achieved by the reaction of 2,3-di-O-benzyl-4,6-O-b...
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PMID: 18528988
PDF is available here.
PDF is available here.
Abstract
We report a one-pot synthesis of a novel class of chemically modified vegetable oils from epoxidized triacylglycerols and various anhydrides. In an anhydrous solvent, boron trifluoride etherate is used as catalyst to simultaneously open the oxirane ring and activate the anhydride. The reaction was m...
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PMID: 18399638
PDF is available here.
PDF is available here.
Analytical Biochemistry (376)2 2008
Abstract
Analysis of trimethyl carboxyphosphate samples by gas chromatography-mass spectrometry, using typical conditions resulted in significant decomposition of the analyte. Optimization of injection conditions, including conditioning of the injection port liner, produced a dramatic increase in observed pe...
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PMID: 18294947
PDF is available here.
PDF is available here.
Abstract
Title compounds [3'-sulfonylesters of 2,5'-anhydro-1-(2-deoxy-beta-d-threo-pentofuranosyl)thymine: 2,5'-anhydro-1-(2-deoxy-3-methanesulfonyl-beta-d-threo-pentofuranosyl)thymine (1a); 2,5'-anhydro-1-(2-deoxy-3-(4-nitrobenzenesulfonyl)-beta-d-threo-pentofuranosyl)thymine (1b); 2,5'-anhydro-1(-2-deoxy-...
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PMID: 18482678
PDF is available here.
PDF is available here.
Biomaterials (29)15 2008
Abstract
These results suggest that this system may be useful as an injectable delivery system for long-term delivery of macromolecules....
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PMID: 18299148
PDF is available here.
PDF is available here.
Abstract
Abstract
Well-controlled poly(alpha-hydroxyacids) featuring pendant carboxylic acid groups were prepared under mild conditions via DMAP-catalyzed ROP of the O-carboxyanhydrides derived from glutamic and lactic acids.
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PMID: 18379693
PDF is available here.
PDF is available here.
Abstract
We have therefore developed hydrogel materials that contain both a protein (gelatin) and a glycosaminoglycan (chondroitin sulphate) component. To enable a permanent crosslinking, gelatin and chondroitin sulphate were first chemically modified using methacrylic anhydride. Hydrogels containing modifie...
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PMID: 18299964
PDF is available here.
PDF is available here.
Biomaterials (29)10 2008
Nanostructured conductive material containing ferrocenyl for reagentless amperometric immunosensors.
Abstract
This work describes a two-step conjugate synthesis of a porous organometallic nanostructured materials composed of ferrocenemonocarboxylic (Fc-COOH) and 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) and then a reagentless amperometric immunosensor prepared with positively charged gold nanopar...
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PMID: 18166224
PDF is available here.
PDF is available here.
Nucleic Acids Research (36)6 2008
Abstract
LNA (locked nucleic acids, i.e. oligonucleotides with a methyl bridge between the 2' oxygen and 4' carbon of ribose) and 2,6-diaminopurine were incorporated into 2'-O-methyl RNA pentamer and hexamer probes to make a microarray that binds unpaired RNA approximately isoenergetically. That is, binding...
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PMID: 18252773
PDF is available here.
PDF is available here.
Abstract
The acid treatment of a ruthenabenzene yielded an unusual dialdehyde. Interestingly, this dialdehyde has notable anti-oxidative properties and resists even nitric acid. This stability is confirmed by chemical and electrochemical experiments. In addition, a stable cyclic anhydride is synthesized from...
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PMID: 18336045
PDF is available here.
PDF is available here.
ChemBioChem (9)5 2008
Abstract
Abstract
Starting from calcium sulfate (gypsum) as fermentation byproduct of lactic acid production process, high-performance composites have been produced by melt-blending polylactide (PLA) and beta-anhydrite II (AII) filler, i.e., calcium sulfate hemihydrate previously dried at 500 degrees C. Characterized...
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PMID: 18275148
PDF is available here.
PDF is available here.
Abstract
This communication describes the chemoselective metal-free reduction of tertiary amides to the corresponding amines. Hantzsch ester is used as a mild reducing agent for the reduction of trifluoromethanesulfonic anhydride activated amides providing the tertiary amines with high functional group toler...
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PMID: 18076177
PDF is available here.
PDF is available here.
Acta Biochimica Polonica (55)1 2008
Abstract
Nucleoside triphosphate diphosphohydrolase--NTPDase1 (apyrase, EC 3.6.1.5) was modeled based on sequence homology. The single polypeptide chain of apyrase is folded into two domains. The putative catalytic site with the apyrase conserved regions (ACR 1-5) is located between these two domains. Modeli...
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PMID: 18335113
PDF is available here.
PDF is available here.
Abstract
We identified three potential catalytic cycles (A, B, C) of GPx-like activity that are interconnected by key metabolites. To study the relative contribution of these cycles to the catalytic activity, we prepared selected reaction intermediates and found that the activity of seleninic acid anhydride...
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PMID: 18604859
PDF is available here.
PDF is available here.
Abstract
Recent advances in pyrimidine synthesis are described. Modification of conventional strategies involving N-C-N fragment condensation with 1,3-dicarbonyl derivatives remains a common theme in current literature. Other methods, including N-C fragment condensation strategies, provide reactive intermedi...
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PMID: 18384023
PDF is available here.
PDF is available here.
Abstract
Poly(octadecanoic anhydride) (POA) has been prepared by melt polycondensation of octadecanoic diacid. POA was characterized by Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). The results of in vitro degradation and SEM...
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PMID: 17577635
PDF is available here.
PDF is available here.
Abstract
We report the feasibility of obtaining peptides with homochiral sequences composed of up to 25 residues of the same handedness in the polymerization of racemic valine or leucine N-carboxyanhydrides in aqueous solutions, as initiated by amines. The composition of the oligopeptides was determined by M...
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PMID: 18956401
PDF is available here.
PDF is available here.
Abstract
Salicylate-based poly(anhydride-esters) were synthesized via two different methods, melt-condensation and solution polymerization, and the resulting polymers were compared. Acetylsalicylic acid was used as a model compound to mimic the active polymer chain-ends during melt-condensation, and formed a...
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PMID: 18854123
PDF is available here.
PDF is available here.
Abstract
Abstract
Abstract
Abstract
Abstract
A simple, rapid, solvent-free, room temperature one pot synthesis of benzene ring acylated and demethylated analogues of harmine using acyl halides/acid anhydrides and AlCl(3) has been developed. Eight different acyl halides/acid anhydrides were used in the synthesis. The resulting mixture of produc...
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PMID: 18794774
PDF is available here.
PDF is available here.
Abstract
Di-D-fructose dianhydrides (DFAs) comprise a unique family of stereoisomeric spiro-tricyclic disaccharides formed upon thermal and/or acidic activation of sucrose- and/ or D-fructose-rich materials. The recent discovery of the presence of DFAs in food products and their remarkable nutritional featur...
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PMID: 18794777
PDF is available here.
PDF is available here.
Abstract
The three-dimensional structure of a unique polymorph of the anticancer drug paclitaxel (Taxol) is established using solid state NMR (SSNMR) tensor ((13)C & (15)N) and heteronuclear correlation ((1)H-(13)C) data. The polymorph has two molecules per asymmetric unit (Z' = 2) and is thus the first conf...
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PMID: 18167583
PDF is available here.
PDF is available here.
Biomaterials (28)35 2007
Abstract
These results demonstrate that incorporation of reactive diluents and nonreactive additives into networks of photocrosslinked anhydrides can improve system properties as a material for bone replacement....
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PMID: 17825904
PDF is available here.
PDF is available here.
Abstract
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment and General Theory (111)40 2007
Abstract
We report a detailed kinetic study of the acidic degradation of erythromycin A and of erythromycin A 2'-ethyl succinate (the market-leading pediatric prodrug), investigating the reaction rates and degradation products via NMR. This reveals that the accepted mechanism is incorrect and that both the e...
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PMID: 17880049
PDF is available here.
PDF is available here.
Abstract
Abstract
This study was directed to look at the chemical composition of maleo-pimaric and fumaro-pimaric rosins made of unmodified rosin with maleic anhydride (MA) or fumaric acid (FA). The results showed that one peak of a maleopimaric acid (MPA) adduct on the chromatogram was obtained when a sample of this...
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PMID: 19090099
PDF is available here.
PDF is available here.