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Showing 1 to 8 of 8 for “"Dimethylene"”.

  1. (1) Artificial Synovial Fluid and Cartilage. (2) Non-Manumitative GD3+ Hosts as MRI Contrast Agents. (3) Five-Member Heterocycles as Switchable Ferromagnetic Coupling Units. (4) Liquid Crystal Opto-Optical Switch: Non-Destructive Information Retrieval Based on a Photochromic Fulgide as Trigger

    Janicki, Slawomir ZbigniewUniversity of Illinois at Urbana-Champaign2015

    … III describes a series of 1,3-, 2,5-, and 2,4-dimethylene five-member heterocycles as new ferromagnetic coupling units. Full geometry optimization of structures with heteroatoms ranging from Be to O and from Mg to S at the CASSCF level with energy calculation at the MCQPDT2 level allowed for …

    uiuc Repository record

  2. I. 1,2-Dimethylene- and 1,2-Dioxo-cycloalkanes: Structure, Spectra, and Relation to Their Open-Chain Analogs. II. Medium Rings via Electrolytic Reduction of Bicyclic α-Aminoketones

    Mottus, Edward HugoUniversity of Illinois at Urbana-Champaign1953

    uiuc Repository record

  3. Observation by flow 1H NMR and dimerization kinetics and products of reactive ortho-quinodimethanes and benzocyclobutadiene

    Fischer, David1990

    <p>The reactive o-quinodimethanes, 1,2-dimethylene-1,2-dihydronaphthalene (9) and o-xylylene (1) were observed by flow [superscript]1H NMR spectroscopy at room temperature. The [superscript]1H NMR spectrum of 9, generated in acetonitrile-d[subscript]3 (CD[subscript]3CN) by fluoride ion induced …

    iastate Repository record

  4. A chromatographic investigation into the reactions of urea and formaldehyde.

    Ludlam, Peter RaymondDorset Institute of Higher Education1988

    … molar ratio 1: 1.5 to 1: 2.5 demonstrated that dimethylene ether linkages were formed to a greater degree than simple methylene linkages. It has been shown that the ammonia formed by hydrolysis of urea was converted fistly into methylamine and subsequently into 1,3,5-triazin-4-ones structures. …

    bournemouth Repository record

  5. The synthesis and properties of liquid crystals with bulky terminal groups for bookshelf geometry ferroelectric mixtures

    Radini, Ibrahim Ali M.University of Hull2010

    … unit, each separated from the core by a short (dimethylene) chain, with the other terminal chain being either octyloxy or heptyl. Unusually for liquid crystals with bulky terminal chains, the smectic phase stability (particularly smectic C) is upheld by more than the nematic phase stability, and …

    hull Repository record

  6. Interaction of phenol-formaldehyde condensates with isoprene rubber

    Roca Perez, RafaelPolytechnic of North London1983

    … contain at least two phenolic nuclei joined by dimethylene ether or methylene links.

    london-metro Repository record

  7. Experimental and theoretical vibrational spectroscopic studies of diketopiperazines

    Khan, Ahsan AliUniversity of Greenwich2017

    … (AMDKP) and 3,6-dimethylene-piperazine-2,5-dione (DMDKP), were synthesised and their Raman and IR spectra obtained in both the solid and aqueous solution state (AMDKP) and in the solid state only (DMDKP). DFT calculations of molecular structures and their …

    greenwich Repository record

  8. Investigation of mixing in the melting regime during polymer compounding

    Ratnagiri, Ramabhadra, 1972-Massachusetts Institute of Technology2000

    … polyethylene, poly(ethylene-co-cyclohexane dimethylene terephthalate)/ polyethylene. and polybutylene/polycaprolactone blends were studied. These model blends were chosen based on the melt viscosity ratio and the relative softening temperatures of the two components. These two parameters …

    mit Repository record