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  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamic predictions of the behavior of Fe-Cr-Al alloys in coal gasifier environments (1979)
    Springer
    Oxidation of metals 13 (1979), S. 13-23 
    Details
    ISSN: 1573-4889
    Keywords: thermodynamics ; stability diagrams ; Fe-Cr-Al ; corrosion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The construction of thermodynamic stability diagrams for the Fe-Cr-Al system is discussed. The constructed diagrams are used to predict materials behavior at coal gasifier oxygen and sulfur potentials. Experiments are run to compare predicted results with experimental observations. Powder mixtures of FeS, Cr2O3, and Al2O3 are used to observe the formation of the iron-chromia and iron-alumina spinels. The spinels are observed at both 871 and 982° C. The formation of an alumina spinel is observed only on the Fe-10Al alloy, whereas no iron-chromia spinel is found on the Fe-Al-Cr alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00715868
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  • 2
    Electronic Resource
    Electronic Resource
    Preliminary observations of the thermodynamic predictions of Fe-Cr-Ni alloys in coal gasifier environments (1979)
    Springer
    Oxidation of metals 13 (1979), S. 197-202 
    Details
    ISSN: 1573-4889
    Keywords: thermodynamics ; stability diagrams ; spinels ; Fe-Cr-Ni ; corrosion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The construction of thermodynamic stability diagrams for the Fe-Cr-Ni systems is discussed. The constructed diagrams are used to predict materials behavior at coal gasifier oxygen and sulfur potentials. Some preliminary experiments are run to compare predicted results with experimental observations. Powder mixtures of FeS, NiS, and Cr 2 O 3 are used to observe the formation of the iron-chromia and nickel-chromia spinels at 871° C. Only the iron-chromia spinel was observed. No spinels were observed on 310 stainless steel samples exposed to the same environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00611979
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  • 3
    Electronic Resource
    Electronic Resource
    Purine, VIII. Über die Umsetzungen heterocyclischer o-Diamino-Verbindungen mit Acetylbrenztraubensäureester (1969)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 4032-4042 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Kondensation von 2.5-Diamino-4-methylamino-6-oxo-1.6-dihydro-pyrimidin (4) mit Acetylbrenztraubensäureester liefert bei pH 1 überraschenderweise 82% 8.9-Dimethylguanin (16) und 15% 6.8-Dimethyl-isoxanthopterin (11), während bei pH 5 erwartungsgemäß 8-Methyl-6-acetonyl-isoxanthopterin (10) resultiert. Nach Isotopenversuchen mit 4-14C-markiertem Acetylbrenztraubensäureester findet sich dieses Atom in der 8-Position des Purin Derivates wieder. Analoge Umsetzungen mit einer Reihe von 4(5)-Amino-5(4)-alkyl(aryl)-amino-pyrimidinen (5-9) bzw. entsprechend substituierten o-Diamino-pyridinen (25,26) und mit N-Methyl-o-phenylendiamin werden beschrieben. pKa-Werte und UV-Spektren der synthetisierten Produkte wurden bestimmt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19691021210
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  • 4
    Electronic Resource
    Electronic Resource
    Pteridine, LIX. Synthese von 7-Amino-, 7-Hydroxy- und 7-Methoxylumazin-5-oxiden und eine neue Pteridin → Purin-Umwandlung (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3203-3215 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pteridines, LIX. Synthesis of 7-Amino-, 7-Hydroxy- and 7-Methoxylumazine 5-Oxides and a new Pteridine → Purine Transformation7-Hydroxy- (5,7) and 7-methoxy-6-methyllumazines (6,8) can be converted to the corresponding 5-oxides 12-15 by H2O2 oxidation. Refluxing in acetic anhydride lead to deoxygenation of the 7-methoxylumazine 5-oxides (13,15) whereas the corresponding 7-hydroxy derivatives (12, 14) react under ring contraction to 1,3-disubstituted uric acids (25, 26). A possible reaction mechanism of this pteridine → purine transformation will be discussed on the basis of isotope experiments.
    Notes: 7-Hydroxy- (5, 7) und 7-Methoxy-6-methyllumazine (6, 8) lassen sich durch Oxidation mit H2O2 in die entsprechenden 5-Oxide 12-15 überführen. Beim Kochen mit Acetanhydrid werden die 7-Methoxylumazin-5-oxide (13, 15) zu den Ausgangsverbindungen desoxygeniert, während die entsprechenden 7-Hydroxy-Derivate (12, 14) unter Ringverengung 1,3-disubstituierte Harnsäuren (25,26) liefern. Ein möglicher Reaktionsmechanismus dieser Pteridin → Purin-Umwandlung wird auf der Basis von Isotopenexperimenten diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731061010
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  • 5
    Electronic Resource
    Electronic Resource
    Pteridine, XLVII Struktur von Xanthopterin-peroxid und seine Umwandlung in Melanurensäure (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3069-3072 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pteridines, XLVII The Structure of Xanthopterin-peroxide and its Transformation into Melanuric AcidThe structure of „xanthopterin-peroxids“ (2) is discussed and a mechanism for its transformation to melanurenic acid (4) by hydrogen peroxide is proposed on the basis of 14C-experiments.
    Notes: Die Struktur des „Xanthopterin-peroxide“ (2) wird diskutiert und für seine Umwandlung in Melanurensäure (4) mittels H2O2 auf der Basis von 14C-Experimenten ein Mechanismus vorgeschlagen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711041010
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