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Browsing by Subject "Hydrolysis"

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    • Article  

      2-(Pyridin-2-yl)ethanol as a protecting group for carboxylic acids: Chemical and thermal cleavage, and conversion of poly[2-(pyridin-2-yl)ethyl methacrylate] to poly(methacrylic acid) 

      Elladiou, Marios; Patrickios, Costas S. (2012)
      In this communication, we show that 2-(pyridin-2-yl)ethanol is a good protecting group for methacrylic acid (MAA), which can be selectively removed, after polymerization, either chemically under alkaline conditions or ...

    • Article  

      3,4,5-Triarylisothiazoles via C-C coupling chemistry 

      Christoforou, Irene C.; Koutentis, Panayiotis Andreas (2007)
      The regiocontrolled preparation of triarylisothiazoles is presented. 3-Halo-5-phenylisothiazole-4-carbonitriles, 1 (hal = Cl) and 18 (hal = I), are converted into the corresponding 4-bromo derivatives 5 (3-hal = Cl) and ...

    • Article  

      The A and B fragments of normal type I procollagen have a similar thermal stability to proteinase digestion but are selectively destabilized by structural mutations 

      Constantinou-Deltas, Constantinos D.; VOGEL, B. E.; JEFFREY, J. J.; PROCKOP, D. J. (1987)
      Previous studies demonstrated that the thermal stability of the procollagen triple helix can be assayed by digesting the protein for short periods with high concentrations of trypsin and chymotrypsin. Here we cleaved human ...

    • Article  

      ABC triblock polymethacrylates: Group transfer polymerization synthesis of the ABC, ACB, and BAC topological isomers and solution characterization 

      Patrickios, Costas S.; Lowe, A. B.; Armes, S. P.; Billingham, N. C. (1998)
      ABC triblock copolymers of methyl methacrylate (MMA), (dimethylamino)-ethyl methacrylate (DMAEMA), and tetrahydropyranyl methacrylate (THPMA) consisting of 12 units of each type of monomer were synthesized by group transfer ...

    • Article  

      ABC Triblock Terpolymers with Orthogonally Deprotectable Blocks: Synthesis, Characterization, and Deprotection 

      Elladiou, Marios; Patrickios, Costas S. (2015)
      The development and availability of new protecting groups are vital for all branches of synthetic chemistry. Equally vital is the facile and selective removal of these groups, leaving intact other protecting groups which ...

    • Article  

      Chemistry of 4-dicyanomethylene-1,2,6-thiadiazines 

      Koutentis, Panayiotis Andreas; Rees, C. W. (2000)
      The chlorine atoms in 3,5-dichloro-4-dicyanomethylene-1,2,6-thiadiazine 1 are readily displaced by thiophenols in the presence of Hünig's base, the first at -78 °C and the second at 20 °C to give the orange mono- and ...

    • Article  

      A cleavable network based on crosslinked star polymers containing acid-labile diacetal crosslinks: Synthesis, characterization and hydrolysis 

      Themistou, Efrosyni; Patrickios, Costas S. (2008)
      A hydrolyzable model network comprising interconnected star polymers was prepared by the sequential group transfer polymerization of methyl methacrylate and the acid-labile diacetalbased dimethacrylate crosslinker ...

    • Article  

      A degradable atom transfer radical polymerization inimer: Synthesis, polymerization, and cleavage of the resulting polymer products 

      Elladiou, Marios; Patrickios, Costas S. (2017)
      A novel degradable inimer for atom transfer radical polymerization (ATRP), 2-(6-(2-((2-bromo-2-methylpropanoyl)oxy)ethyl)pyridin-2-yl)ethyl methacrylate (PyDEBrMΑ), was synthesized by the two-step esterification of ...

    • Article  

      Degradable polymer networks and star polymers based on mixtures of two cleavable dimethacrylate crosslinkers: Synthesis, characterization, and degradation 

      Themistou, Efrosyni; Patrickios, Costas S. (2009)
      Mixtures of two cleavable dimethacrylate crosslinkers, the hydrolyzable di(methacryloyloxy-1-ethoxy)methane (DMOEM) and the thermolyzable 1,1-ethylenediol dimethacrylate (EDDMA), were used for the preparation of neat ...

    • Article  

      Development of a Reliable Analytical Protocol for the Isolation of Cholesterol Oxidation Products—a Comparison of Different Lipid Extraction and Saponification Methods 

      Constantinou, Michalis S.; Georgiou, Christiana A.; Kapnissi‐Christodoulou, Constantina P. (2015)
      The main objectives of this study were (i) the optimization and the validation of a high performance liquid chromatographic method for the simultaneous determination of seven cholesterol oxidation products (COPs), (ii) the ...

    • Article  

      End-linked, amphiphilic, degradable polymer conetworks: Synthesis by sequential atom transfer radical polymerization using a bifunctional, cleavable initiator 

      Rikkou-Kalourkoti, Maria D.; Loizou, Elena; Porcar, L.; Matyjaszewski, K.; Patrickios, Costas S. (2012)
      End-linked, degradable, amphiphilic polymer conetworks (APCNs) of various compositions and architectures were synthesized by sequential atom transfer radical terpolymerization of monomers and cross-linker using a cleavable, ...

    • Article  

      Near-monodisperse α-hydroxy and α,ω-dihydroxy amine-based polymers: Synthesis and characterization 

      Costa, Costas N.; Patrickios, Costas S. (1999)
      α-Hydroxy and α,ω-dihydroxy polymers of 2-(dimethylamino)ethyl methacrylate (DMAEMA) of various molecular weights were synthesized by group transfer polymerization (GTP) in tetrahydrofuran (THF), using 1-methoxy-1-(trime ...

    • Article  

      Near-monodisperse, catalytically active, imidazole-containing homooligomers: Synthesis by group transfer polymerization and solution characterization 

      Simmons, M. R.; Patrickios, Costas S. (1999)
      Oligomers covering degrees of polymerization up to 23 of 2-(1-imidazolyl)-ethyl methacrylate (ImEMA) were synthesized by group transfer polymerization (GTP) in propylene carbonate and tetrahydrofuran (THF). While GTP ...

    • Article  

      Sample preparation: A critical step in the analysis of cholesterol oxidation products 

      Georgiou, Christiana A.; Constantinou, Michalis S.; Kapnissi‐Christodoulou, Constantina P. (2014)
      In recent years, cholesterol oxidation products (COPs) have drawn scientific interest, particularly due to their implications on human health. A big number of these compounds have been demonstrated to be cytotoxic, mutagenic, ...

    • Article  

      The soy isoflavone daidzein improves the capacity of tamoxifen to prevent mammary tumours 

      Constantinou, Andreas I.; White, B. E. P.; Tonetti, D.; Yang, Y.; Liang, W.; Li, W.; Van Breemen, R. B. (2005)
      The aim of this study was to determine how the efficacy of tamoxifen is affected when combined with soy isoflavones. To address this, female Sprague-Dawley rats were placed on diets supplemented with tamoxifen, genistein, ...

    • Article  

      Spectroscopic Study of the Hydrolysis of PuO22+ in Aqueous Solution 

      Pashalidis, Ioannis; Kim, J. I.; Ashida, T.; Grenthe, I. (1995)
      The hydrolysis of Pu(VI) is investigated under Ar atmosphere in the pH range between 4.5 and 9.0 at 22°C in 0.1 M NaC104 solution in contact with an initial solid phase, PuO2CO3(s). Under the given conditions, PuO2CO3(s) ...

    • Article  

      Star polymers and polymer networks containing a novel, hydrolyzable diacetal-based dimethacrylate cross-linker: Synthesis, characterization, and hydrolysis kinetics 

      Themistou, Efrosyni; Patrickios, Costas S. (2007)
      A hydrolyzable diacetal dimethacrylate cross-linker, MOEME, was retrieved from the same product mixture where its monoacetal homologue, DMOEM, was synthesized. MOEME was copolymerized with MMA by GTP after purification, ...

    • Article  

      Symmetrical polymer systems prepared using a degradable bifunctional atom transfer radical polymerization initiator: Synthesis, characterization, and cleavage 

      Elladiou, Marios; Kalogirou, Andreas S.; Patrickios, Costas S. (2017)
      Linear (co)polymers and dimethacrylate-end-linked polymer networks of methyl methacrylate with 2-(dimethylamino)ethyl methacrylate, cleavable in the middle of the polymer chain, either under thermolysis or alkaline hydrolysis ...

    • Article  

      Synthesis and aqueous solution characterization of catalytically active block copolymers containing imidazole 

      Simmons, M. R.; Patrickios, Costas S. (1998)

    • Article  

      Synthesis and aqueous solution characterization of catalytically active homopolymers, block copolymers and networks containing imidazole 

      Patrickios, Costas S.; Simmons, M. R. (2000)
      Imidazole-containing polymers were prepared and characterized in terms of their hydrolytic activity. Unlike similar materials synthesized in the 1960s, the polymers are of precise molecular weight and controlled structure ...

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