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  • 1
    Electronic Resource
    Electronic Resource
    Combinatorial approaches to harmacophoric heterocycles: A solid-phase synthesis of 3,1-benzoxazine-4-ones (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 61 (1998), S. 13-16 
    Details
    ISSN: 0006-3592
    Keywords: solid-phase synthesis ; 3,1-benzoxazine-4-ones ; serine protease inhibitor ; heterocyclic acylating agents ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An efficient solid-phase synthesis of 3,1-benzoxazine-4-ones is described. Immobilized amino acid based functionalized urea derivatives 2 undergo a high yielding heterocyclization under mild conditions in presence of coupling reagents (DIC, TsCl/Py, or Ac2O) to afford 3,1-benzoxazine-4-ones 6. The method offers broad scope for structural and chemical diversity, and is amenable for combinatorial synthesis of 3,1-benzoxazine-4-ones libraries with potential for discovery of novel serine protease inhibitors. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng (Comb Chem) 61:13-16, 1998.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Vaporization processes of borosilicate coatings studied by high temperature mass spectrometry and using an induction plasma generator (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 127-131 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A new approach has been applied to study processes which take place during the thermochemical action of air (or other) plasma on heat protection materials. Vaporization processes of the borosilicate coating of ‘Buran's’ heatprotective tiles, both the initial state and after rf-entry simulation testing (up to 100 landings), were investigated by the Knudsen mass spectrometric effusion method. Modelling of the thermochemical action of the shock-layer plasma onto the front surfaces of real-scale tiles was carried out by using an induction plasma genetor of 500kW power. It was established that the thermochemical action of the plasma causes, essentially, a decrease of vapour pressure over the coating. However, despite this decrease, the pressures observed are significantly higher than those over the SiO2-B2O3 system at the same temperature, due to gas-phase SiO production by reaction between boron and silicon oxides and SiB4, which are contanied in the coating. The data available aiiow one to postulate the presence of the SiBO molecule in the gas phase. Data on mass-loss rates obtained by direct measurments after re-entry simulation compared nwell with the values calcuted from mass spectrometric data. It is suggested that the difference observed is caused by thermochemical action of atomic oxygen on the coating.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070203
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallinity of cellulose and its accessibility during deuteration (1994)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 45 (1994), S. 121-123 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The accessibility of cellulose samples with different supermolecular structure during deuteration has been studied by NMR. It has been established that the content of accessible regions is higher than the content of amorphous regions determined by the X-ray method. A modified crystalline-amorphous model of cellulose structure is proposed to explain this result. According to this model, thin surface layers of crystallites are less ordered and are accessible during the deuterium exchange. The quantitative ratio between the accessibility and the crystallinity of cellulose has been established.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1994.010450211
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