1,216 research outputs found

    How do Structural Formulas Embody the Theory of Organic Chemistry?

    Get PDF
    Organic chemistry provides fertile ground for scholars interested in understanding the role of non-linguistic representations in scientific thinking. In this discipline, it is plausible to think of textual representation as supplementing theories whose principle expression is diagrammatic. Among the many sorts of diagrams employed by organic chemists, structural formulas are the most important. In this paper, by examining two central episodes in the development of structural formulas -- Kekulé’s proposal of a structure for benzene and Ingold’s explanation of dipole moments in terms of ‘mesomerism’ – I investigate how the norms for the production and interpretation of structural formulas evolve in response to experimental results. I conclude that one principle way in which structural formulas embody the theory of organic chemistry is through these evolving norms

    Bulletin No. 14: Creating New Landscapes with Herbicides, A Homeowner\u27s Guide

    Get PDF
    A how-to-do-it handbook describing the formulations and techniques to be used in eliminating unwanted plants such as poison ivy. The use of herbicides in naturalistic landscaping, wildlife and woodlot management are included. [Addendum on new data on chemicals inserted 1970] 30 pp

    Electrochemistry of ferrocenylphosphines FcCH₂PR₂ (Fc=(η⁵-C₅H₅)Fe(η⁵-C₅H₄); R=Ph, CH₂OH and CH₂CH₂CN), and some phosphine oxide, phosphine sulfide, phosphonium and metal complex derivatives

    Get PDF
    Electrochemical studies of the free ferrocenylphosphine ligands FcCH₂PR₂ (Fc=(η⁵-C₅H₅)Fe(η⁵-C₅H₄); R=Ph, CH₂OH and CH₂CH₂CN) and some phosphine oxide, phosphine sulfide, phosphonium and metal derivatives are described. The free ligands exhibit complex voltammetric responses due to participation of the phosphorus lone pair in the redox reactions. Uncomplicated ferrocene-based redox chemistry is observed for PV derivatives and when the ligands are coordinated in complexes cis-PtCl₂[FcCH₂P(CH₂OH)₂], PdCl₂[FcCH₂P(CH₂OH)₂], [Au{FcCH₂P(CH₂OH)₂}₂]Cl, RuCl₂(η⁶-C₁₀H₁₄)[FcCH₂P(CH₂OH)₂] and RuCl₂(η⁶-C₁₀H₁₄)(FcCH₂PPh₂). The reaction pathways of the free ligands after one-electron oxidation have been examined in detail using voltammetry, NMR spectroscopy and electrospray mass spectrometry. Direct evidence for formation of a P---P bonded product is presented

    DNA profiling: The first 30 years [Editorial]

    Get PDF

    The raspberry byturus: Byturus unicolor

    Get PDF

    Flour mill fumigation

    Get PDF

    Spraying machinery accessories

    Get PDF

    Heat for control of cereal insects

    Get PDF

    Pleasant Porter, tribal statesman

    Get PDF
    Thesis (M.A.)--University of Oklahoma, 1953.Includes bibliographical references (leaves 195-210
    corecore