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  • Organic Chemistry  (7)
  • Polymer and Materials Science  (6)
  • 2010-2014
  • 2000-2004
  • 1980-1984  (12)
  • 1940-1944  (1)
  • 1930-1934
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis, Properties, and Crystal Structure of Silyl Nitronates (Silyl Esters of aci-Nitroalkanes): Towards the SN2 Reaction Path with Retention of Configuration at Silicon (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 697-710 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An efficient and flexible method for the preparation of silyl nitronates is described (see 1-10). NMR. spectral investigations indicate a rapid 1,3-silyl migration process, with an activation energy of about 10 kcal mol-1. X-ray crystallographic studies on the silyl nitronates 3 and 8 show structures that lean towards an SN2 retention pathway at silicon.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630320
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  • 2
    Electronic Resource
    Electronic Resource
    Erhöhung der Nachweisempfindlichkeit von Cyclosporin A durch Derivatisierung mit 2-Naphthylselenylchlorid (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 728-732 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enhancement of Detection Sensitivity of Cyclosporin A by Derivatization with 2-NapthylselenylchlorideThe UV./HPLC. detection sensitivity of cyclosporine A 1, an immunosuppressive cyclic undecapeptide containing one D-aminoacid and seven N-methylated aminoacids, is enhanced by a factor of 3-4 (limit of detection 5 ng) by conversion of the characteristic side chain of amino-acid-1 to the β-naphthylseleno-substituted tetrahydrofuran derivative 4.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630323
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  • 3
    Electronic Resource
    Electronic Resource
    Herstellung von 1, 3-Diketonen und von Nitro-diketonen durch (1:1)-Acylierungen von Lithiumenolaten mit Acylchloriden (1981)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 716-735 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of 1,3-Diketones and of Nitro-diketones by (1:1)-Acylation of Lithium Enolates with Acyl ChloridesSlow addition of precooled solutions of lithium enolates in THF (Fig. 1) to solutions of equimolar amounts of acyl chlorides in the same solvent at temperatures between - 80 and - 100° furnishes 1, 3-diketones in acceptable to good yields (Tables 1-3). Even 3-nitropropionyl and 4-nitrobutyryl chloride can be employed for the (1:1)-acylation of enolates to give the synthetically useful 5- and 6-nitro-1, 3-diketones 13 and 25, respectively. The scope and the limitations of this method of preparing 1, 3-diketones are given and are compared with alternative methods.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19810640313
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  • 4
    Electronic Resource
    Electronic Resource
    Improved Nitroaldol Reactions and Reductive Routes to Vicinal AminoalcoholsDedicated to Prof. Vladimir Prelog on the occasion of his 75th birthday (1981)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 2264-2271 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Regioselective and flexible procedures are described for the preparation of a variety of protected vicinal nitroalcohols 1, 3 and 5 (see Scheme 5), as is an efficient method for their reduction to the corresponding vicinal aminoalcohols 2, 4 and 6.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19810640732
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  • 5
    Electronic Resource
    Electronic Resource
    Diastereoselective Synthesis of Nitroaldol DerivativesPart of the results described here was mentioned previously in a review article [1] and in a communication [2]. (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1101-1133 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three methods are described by which diastereomerically enriched nitroaldols and their O-silylated derivatives can be prepared. threo-Nitroaldols prevail up to 10:1 over the erythro-isomers if doubly deprotonated nitroaldols 28 are quenched with acetic acid (THF/HMPT or DMPU, - 100°) (see Scheme 5 and Table 2). O-Trimethyl- or O-(t-butyl)dimethylsilylated (TBDMSi) erythro-nitroaldols can be obtained by protonation of the corresponding lithium nitronates (35, 39) in THF at low temperature (see Schemes 6 and 7). The erythro-O-TBDMSi-nitroaldol derivatives are also formed in the fluoride catalyzed addition of TBDMSi-nitronates (40-45) to aldehydes (see Schemes 8 and 9), In the latter reaction no 1,2-asymmetric induction is observed if a-branched silylnitronates or aldehydes are employed (see 48/49 and 50/51) - The stereochemical course of the reactions leading to erythro-O-TBDMSi-nitroaldols follows topological rules of broad applicability (see Scheme 10); possible mechnisms are discussed. - The configuration of diasteromerically 13C-NMR. Spectroscopy. - Some examples of the preparation of diastereimerically enriched 1,2-aminolcohols by reduction of the correspondence nitro compounds without loss of configurational purity are described (see Schemes 11 and 12).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650402
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  • 6
    Electronic Resource
    Electronic Resource
    Die reversible elektrochemische Ein- und Auslagerung von Anionen in Festbett-Elektroden aus Graphit (1982)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 54 (1982), S. 530-531 
    Details
    ISSN: 0009-286X
    Keywords: Elektrochemie ; Festbett-Elektroden ; Graphit ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330540526
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  • 7
    Electronic Resource
    Electronic Resource
    Neuartige Batterie-Systeme (1982)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 54 (1982), S. 809-817 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: New battery systems. The reversible storage of electrical energy plays a central role in the development of electric vehicles, load levelling in power stations, and technical utilization of solar energy. Electrochemistry offers interesting solutions with optimal energy density; however, these have reached technical maturity in only a few cases. The conventional lead/acid accumulator is being further improved among aqueous systems. Moreover, various other lines of development have been initiated in recent years, such as nickel/zinc and chlorine/zinc accumulators, which offer totally fresh perspectives from an electrochemical and engineering point of view. In the case of zinc/air and aluminium/air batteries, external redeposition of the metal is envisaged. From a practical point of view, aqueous systems are unsurpassable. Metals with an extremely high negative potential like sodium or lithium can only be cycled in the absence of water. Systems with molten salts or solid electrolytes do not suffer from this drawback. The sodium/sulfur battery, which is characterized by readily available cell components of low environmental impact, is presently undergoing intensive development. However, thermal discharge represents a technical problem. The future of these new developments will be governed by their economics, energy density, energy efficiency, power density, and last but not least by their cyclability. These properties have not yet been optimized in a single system.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330540906
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  • 8
    Electronic Resource
    Electronic Resource
    Formaldehyde release from a model N-methylol system (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3569-3577 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A model N-methylol reactant system based on pyrrolidone derivatives has been used to study the chemical factors that control formaldehyde release. Fabric samples of known composition were prepared from chemically pure reactants and formaldehyde release was determined by the AATCC Sealed Jar Test. This work provides support for prior suggestions and a more direct approach for understanding unexpected results from tests on post-and precure fabrics. In addition, new findings demonstrate that the N-methylol reactant, its byproducts, and pure zinc nitrate are capable of reducing the level of formaldehyde release.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291130
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  • 9
    Electronic Resource
    Electronic Resource
    Liquid-chromatographic determination of rate constants for the cellulose-dimethyloldihydroxyethyleneurea reaction (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 1131-1138 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Rates of the MgCl2-catalyzed reaction between cellulose and 4,5-dihydroxy-1,3-bis(hydroxymethyl)-2-imidazolidinone were measured at 70, 90, and 110°C. The rate constants were determined by curing the resin for various times, extracting the unreacted resin, and determining its concentration by liquid chromatography. The energy of activation was calculated from the rate data. This work confirms the pseudo-first-order behavior of this reaction.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270403
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  • 10
    Electronic Resource
    Electronic Resource
    Reagent residues on N-methylopyrrolidone-treated cotton (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3579-3585 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Residues remaining after drying and curing cotton fabric with either sodium bisulfate or zinc nitrate and N-methylolpyrrolidone, a monofunctional model durable press agent, have been quantitated by high performance liquid chromatography. The residues were identified as pyrrolidone, N-methylolpyrrolidone, N,N′-methylene-bis-2-pyrrolidone, and N,N′-(oxydimethylene)bis-2-pyrrolidone. The two catalysts fixed approximately the same amount of the N-methylolpyrrolidone to cellulose, but generated different ratios of the extractable residues. A comparison of the levels of these residues that are capable of releasing formaldehyde is given. The dominant residue from the NaHSO4 treatment was N-methylolpyrrolidone, while zinc nitrate generated more N,N′-(oxydimethylene)bis-2-pyrrolidone.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291131
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