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Showing 1 to 20 of 65 for “"phosphonic"”.
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Nitrogen Compounds of the Phosphoric and Phosphonic Acids
Made available in DSpace on 2014-12-05T19:35:59Z (GMT). No. of bitstreams: 1 0009145.pdf: 6317038 bytes, checksum: 189e69dc53192acb9a665a1bd8f42394 (MD5) Previous issue date: 1954
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Pathway engineering for the discovery and optimized production of phosphonic acids
… a focus on the class of natural products called phosphonic acids. These compounds have a stable carbon-phosphorus bond, which allow them to mimic phosphate esters and carboxylic acids, making them potential enzyme inhibitors. For the antimalarial phosphonate FR900098, a novel pathway engineering …
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Stereoselective alkylations and rearrangements of chiral phosphonic and phosphinic acid derivatives
… Optically active ($\geq$99.9% e.e.) phosphonic and phosphinic azides were prepared and photolyzed in methanol to effect the phosphorus analogues of the carbonyl-Curtius rearrangement. These studies showed that carbon migration in the phosphinoyl-Curtius rearrangement proceeds with 99% …
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Synthesis of unsymmetrical pendant-armed and phosphonic acid-pendant-armed cross-bridged tetraazamacrocycles
… phosphonate pendant arms and their corresponding phosphonic acid derivatives as well as their Cu(II) complexes are presented. The half-life of decomplexation of Cu(II)·51 in 5M HCl at 90°C was found to be 3.8 hours. Ligand 51 showed faster complexation kinetics relative to known …
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Theoretical investigation of polar zinc oxide surface modification via phosphonic acid self-assembled monolayers
… with a series of chemisorbed fluorinated benzylphosphonic acids has been studied using density functional theory. The calculations indicate that there is a substantial change in the binding energies and work function modification depending on the binding motif. The results also indicate that …
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Effect of a derivatized oxide layer and environment on the bond durability of aluminum/polyimide and titanium/polyimide bonds
… aluminum and titanium involving the reaction of phosphonic acid (RPO(OH)2), R=butyl or vinyl for aluminum and R=vinyl for titanium, has been investigated. The durability of phosphonic acid-pretreated samples was compared with that for P2-etched (ferric sulfate-sulfuric acid) adherends. Samples …
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Synthesis and Functionalization of Poly(ethylene oxide-b-ethyloxazoline) Diblock Copolymers with Phosphonate Ions
… and functionalize pendent groups of PEOX with phosphonic acid. This was achieved through cationic ring opening polymerization (CROP) of 2-ethyl-2-oxazoline monomer onto PEO. These polymerizations used tosylsulfonyl chloride as initiator. Size-exclusion chromatography (SEC) was used to determine …
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Synthesis of Chiral Vanadium Phosphonates and Their Catalytic Activity
… starting materials with chiral and achiral phosphonic acids and phosphonates provided the soluble [BuPPh3]4[(V 2O2(OH)2)6(O3PR)8] R = CH(CH2Ph)Pr and CH(Et)Pr, [(VO)6(O3PR) 8{Cl}] R = CH2Ph, CHMePh-S, and [(V 14O22)(OH)4(O3PR)8] 6- with R = CHEtPr, CH(CH2Ph)Pr, and CH(Me)Ph- S cage …
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Block and Graft Copolymers Containing Carboxylate or Phosphonate Anions
… Binding capabilities of the acrylamide phosphonic acids were investigated through interactions with hydroxyapatite. Previously our group has prepared poly(ethylene oxide)-b-poly(acrylic acid) (PEO-b-PAA) copolymers and used these polymers as carriers for both MRI imaging agents and …
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The synthesis, structure and fungicidal activity of guanidinophosphonic acids and their aminophosphonic precursors
Alkanephosphonic acids of the classes a-amino, a-guanidino, a-(hydroxy)amino, a-thioureido, w-amino, and w-guanidino have been prepared, and also the u-amino and 10-guanidino types having aza substituents In positions 2 and 3 In the alkyl chain. The 1H, 13C, and 31p nmr spectroscopy of these …
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Synthesis and Characterization of Thin films of Novel Functionalised 2,5-Dithienylpyrrole Derivatives on Oxide Substrates
… based monomers, 3-phenyl N-alkyl pyrrolyl phosphonic acids referred as C10PhP and C12PhP and the monomers based on 2,5-dithienylpyrrole were synthesized with different anchoring groups namely, -Si(OMe)3 and-PO3H2 and spacer groups (n= 4, 6, 10, 12, benzyl). SNSnP for …
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DEVELOPMENT OF METAL-CATALYZED REACTIONS OF ALLENES WITH IMINES AND THE INVESTIGATION OF BRΘNSTED ACID CATALYZED ENE REACTIONS
… Brønsted acid catalyzed ene reactions. A phosphonic acid has been identified as a viable catalyst for the carbonyl-ene and imino-ene reaction. In addition, this phosphonic acid was shown to promote a cyclization reaction of hydrazones to generate pyrazolidine derivatives. This chemistry …
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Synthesis of phosphorus/sulfur-based antivirals
… derivatisation of adefovir via the corresponding phosphonic dichloride intermediate and under Garegg-Samuelsson reaction conditions is further discussed. The preparation of novel butyl and dibutyl phosphonate analogues of adefovir using both approaches is described. Attempted coupling of the …
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Design and synthesis of novel P. fulciparum GDH inhibitors for use as potential antimalarial agents
… phosphonates, substituted benzyl-α-hydroxy phosphonic acids and substituted benzyl-α-amino phosphonic acids. These compounds are intended to target one of the recently hypothesised antimalarial drug development targets, Pf-glutamate dehydrogenase (PfGDH). 2) The synthesised compounds were …
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Synthesis and Characterization of Pyrrole Based Adhesion Promoter Systems on Oxide Substrates
… oxidized surfaces, 3-substituted pyrrole alkyl phosphonic acids, 11-(pyrrol-3-yl undecyl) trimethoxysilanes and 1-substituted pyrrole alkyl organosilanes with different chain length were designed and successfully synthesized as adhesion promoters. These new derivatives were studied for their …
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Oberflächenanalytische Untersuchungen an nasschemisch, photochemisch und photothermisch modifizierten Titandioxid-Oberflächen
… dipping in 1 mM ethanolic solutions of octadecyl phosphonic acid (OPA) or semiperfluorinated octadecyl phosphonic acid (SF-OPA). The contact angles for such surfaces were in the range of 50-80° for TiO2 surfaces stored in air and in the range of 80-150° for TiO2 surfaces covered with OPA or …
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The synthesis of fungicidal aminophosphonic acid derivatives
A number of 1-aminoalkanephosphonic acid derivatives incorporating physiologically Iabile groupings (ester, amide e.g. peptide, carbamate and tosyl) were prepared as a development from earlier studies in which certain phosphonic acid derivatives were shown to have previously unrecognised activity …
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Synthesis and structural analysis of [alpha]-aminophosphonic acids and their phosphonate ester derivatives
… and characterisation of novel [alpha]-aminophosphonic acids and their phosphonate ester derivatives. Compounds of these types are of interest because of their potential for biological activity, particularly in the area of agricultural chemistry. The second objective was to investigate the …
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