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Showing 1 to 20 of 46 for “"phosphonic acid"”.
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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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DEVELOPMENT OF METAL-CATALYZED REACTIONS OF ALLENES WITH IMINES AND THE INVESTIGATION OF BRΘNSTED ACID CATALYZED ENE REACTIONS
… reaction for the generation of unnatural amino acids containing densely functionalized alkenes and allene moieties. In addition to studying new reactions, we have worked on the further development of the established ene reaction. The ene reaction is one of the most powerful carbon–carbon …
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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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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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Natural product discovery and engineering at the protein, pathway, and genome scales
… to assemble both a 6-gene resorcylic acid lactone cluster and a 13-gene phosphonic acid biosynthetic cluster. The latter case, in which all 13-genes from a phosphonic acid non-producing strain were placed under individual strong promoters, enabled the production of novel phosphonic …
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Synthesis and Characterization of Poly(2-Ethyl-2-Oxazoline) Functional Prepolymers and Block Copolymers
… side blocks) were partially hydrolyzed in an acidic medium to introduce random charged poly(ethylene imine) units to prepare ionomer structures that may show good salt rejection, water flux and antibacterial properties for membrane-based water purification applications. Phosphonic acid …
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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 Design and Synthesis of Autotaxin Inhibitors and Analogs of Lysophosphatidic Acid
<p>Lysophosphatidic acid (LPA) is a naturally occurring bioactive phospholipid. It has a wide array of biological effects like cell proliferation, survival, migration, apoptosis invasion, wound healing and angiogenesis. Autotaxin (ATX) was identified as an autocrine tumor cell motility factor from …
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Genetic and Biochemical Analysis of Phosphinothricin Tripeptide Biosynthesis in Streptomyces Viridochromogenes
… biosynthesis is the oxidation of hydroxymethylphosphonic acid to phosphonoformaldehyde by PhpE, an alcohol dehydrogenase. Phosphonoformaldehyde is likely then converted into the established intermediate phosphonoformate by the aldehyde dehydrogenase PhpJ (step VI). We demonstrated that …
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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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Organophosphorus acids for hydrometallurgical extraction. The synthesis of di(2-methylcyclohexyl)-, di(3-methylcyclohexyl)-, di(4-methylcyclohexyl)-, di(3,5-dimethylcyclohexyl)-, di(4-t-butylcyclohexyl)-, di(cyclohexylmethyl)- and dicyclohexyl- phosphinic; cyclohexylmethyl monocyclohexylmethylphosphonic; di(2-methylcyclohexyl)-, di(4-methylcyclohexyl)-, di(cyclohexylmethyl)- and di(cyclohexylethyl)- phosphoric acids and their evaluation as potential hydrometallurgical extractants for cobalt or nickel.
… and di(4-methylcyclohexyl) phosphoric acids; cyclohexylmethyl phosphonic acid monocyclohexylmethyl ester, di(cyclohexylmethyl), di(4-methylcyclohexyl), di(4-tert- butylcyclohexyl), di(3-methylcyclohexyl), di(3,5-dimethylcyclohexy) and di(2-methylcyclohexyl) phosphinic acids are …
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Organocatalytic asymmetric mannich-type reactions: an easy approach to optically active amine derivatives
… very versatile for the obtainment of β3-amino acids. Furthermore we performed the first addition of cyclic β-ketoester to α-amido sulfones obtaining the corresponding products in good yield with high level of diastereomeric and enantiomeric excess (Scheme III). Further studies were done about …
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Self-assembled thin polymer film used for sensing application
… a well-packed self-assembled monolayer with phosphonic acid as head group and diacetylenic functional group in the tail formed on AlGaN/GaN surface. According to water contact angle and UV/Vis absorption spectroscopy data, the stability of this self assembled monolayer on oxidized AlGaN/ GaN …
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Understanding the Role of Anisotropy on the Optoelectronic and Colloidal Properties of Quantum Rods for Programmable Self-Assembly with DNA Origami
… the binding strength and surface coverage of phosphonic acid capping ligand was studied using a series of solution nuclear magnetic resonance spectroscopy (NMR) techniques, including the traditional one-dimensional 1H, as well as the more advanced two-dimensional diffusion ordered spectroscopy …
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Low-voltage organic transistors with high transconductance
… and a self-assembled monolayer of octadecyl phosphonic acid (C18PA) and by increasing the channel width of the transistors through the implementation of the multi-finger source/drain contacts. The transistors based on dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) exhibited low turn-on …
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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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