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  • Inorganic Chemistry  (45)
  • MATERIALS, METALLIC  (2)
  • ASTRONOMY
  • 1970-1974  (47)
  • 1955-1959
  • 1910-1914
  • 1973  (27)
  • 1972  (20)
Collection
Keywords
Publisher
Years
  • 1970-1974  (47)
  • 1955-1959
  • 1910-1914
Year
  • 1
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    Hydrogen environment embrittlement of metals (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Hydrogen environment embrittlement refers to metals stressed while exposed to a hydrogen atmosphere. Tested in air, even after exposure to hydrogen under pressure, this effect is not observed on similar specimens. Much high purity hydrogen is prepared by evaporation of liquid hydrogen, and thus has low levels for potential impurities which could otherwise inhibit or poison the absorbent reactions that are involved. High strength steels and nickel-base allows are rated as showing extreme embrittlement; aluminum alloys and the austenitic stainless steels, as well as copper, have negligible susceptibility to this phenomenon. The cracking that occurs appears to be a surface phenomenon, is unlike that of internal hydrogen embrittlement.
    Keywords: MATERIALS, METALLIC
    Type: NASA-CR-2163
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Influence of gaseous hydrogen on metals (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Tensile, fracture toughness, threshold stress intensity for sustained-load crack growth, and cyclic and sustained load crack growth rate measurements were performed on a number of alloys in high-pressure hydrogen and helium environments. The results of tensile tests performed in 34.5 MN/m2 (5000 psi) hydrogen indicated that Inconel 625 was considerable embrittled at ambient temperature but was not embrittled at 144 K (-200 F). The tensile properties of AISI 321 stainless steel were slightly reduced at ambient temperature and 144 K (-200 F). The tensile properties of Ti-5Al-2.5 Sn ELI were essentially unaffected by hydrogen at 144 K (-200 F). OFHC copper was not embrittled by hydrogen at ambient temperature or at 144 K (-200 F).
    Keywords: MATERIALS, METALLIC
    Type: NASA-CR-124410
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  • 3
    Electronic Resource
    Electronic Resource
    Reaktionen mit Cyclobutendionen, XXV. Über die Umsetzung von 2-Hydroxy-1-phenyl-cyclobuten-(1)-dion-(3.4) mit aromatischen Diaminen (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 337-352 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Cyclobutenediones, XXV. On the Treatment of 2-Hydroxy-1-phenyl-1-cyclobuten-3.4-dione with Aromatic Diamines2-Hydroxy-1-phenyl-1-cyclobuten-3.4-dione (PCB-OH, 1) reacts under ring-opening with o-phenylenediamine to form 3-hydroxy-2-phenyl-1 H-pyrrolo[1.2-a]benzimidazol-1-one (2), its functional groups are proved by chemical reactions. On the alkaline and the acid hydrolysis of 2 2-(phenylacetyl)benzimidazole (8) is received. PCB-OH (1) changes with 1.8. diaminonaphthaline into 3-hydroxy-2-phenyl-1 H-pyrrolo[1.2-a]perimidin-1-one (15). There is no more ring-opening with 2.2'-diaminobiphenyl, the varied conditions afford the cyclobutenediylium-diolate 18. The behaviour of N-monosubstituted o-phenylenediamines is different against PCB-OH (1) - under preservation of the cyclobutene system -N-acetyl-o-phenylenediamine first condenses intramolecular and reacts with 1 to form the ammonium salt 21, N-methyl-respectively N-phenyl-o-phenylenediamine react with 1 to form the spiro-[benzimidazolium-2.1'-cyclobutene]olates 22 and 23.
    Notes: 2-Hydroxy-1-phenyl-cyclobuten-(1)-dion-(3.4) (PCB-OH, 1) reagiert mit o-Phenylendiamin unter Ringöffnung zum 3-Hydroxy-2-phenyl-1 H-pyrrolo[1.2-a]benzimidazol-on-(1) (2), dessen funktionelle Gruppen durch chemische Reaktionen nachgewiesen werden. Bei der alkalischen und der sauren Hydrolyse von 2 wird das 2-Phenylacetyl-benzimidazol (8) erhalten. PCB-OH (1) setzt sich mit 1.8-Diamino-naphthalin zum 3-Hydroxy-2-phenyl-1 H-pyrrolo-[1.2-a]perimidin-on-(1) (15) um. Mit 2.2'-Diamino-biphenyl ist keine Ringöffnung mehr möglich, unter veränderten Reaktionsbedingungen entsteht das Cyclobutendiylium-diolat 18. N-Monosubstituierte o-Phenylendiamine verhalten sich gegenüber PCB-OH (1) - unter Erhaltung des Vierrings - unterschiedlich: N-Acetyl-o-phenylendiamin kondensiert zunächst intramolekular und bildet mit 1 das Ammoniumsalz 21, N-Methyl- bzw. N-Phenyl-o-phenylendiamin ergeben mit 1 die Spiro[benzimidazolium-2.1'-cyclobuten]-olate 22 und 23-
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050135
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und Eigenschaften des Dibenzo[c.h]phenothiazinyl-Radikals (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 1142-1147 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of the Dibenzo[c.h]phenothiazinyl RadicalThe stable free title radical 2 is obtained from 7H-dibenzo[c.h]phenothiazine (1) by dehydrogenation with yellow HgO. For 2 a free radical content of 64% in solution (room temperature) and 6% in the crystalline state has been determined by e.s.r. The complex e.s.r. spectrum of 2-solutions is discussed in connection with Hückel calculations. A 1:1-adduct of 1 and 2 in the crystalline state exhibit a radical content of 72% (referred to 2). 2 and the formerly described dinaphtho[2.3-c : 2′.3′hyphen;h]phenothiazinyl (5) display characteristic u.v. spectra.
    Notes: 7H-Dibenzo[c.h]phenothiazin (1) liefert bei der Dehydrierung mit gelbem HgO das stabile freie Titel-Radikal 2. Der Radikalgehalt (Raumtemperatur) beträgt nach ESR-Messungen in Lösung 64%, im Kristall 6%. Das linienreiche Lösungs-ESR-Spektrum wird im Zusammenhang mit Hückel-Rechnungen diskutiert. Ein 1:1-Addukt von 1 und 2 weist (im Kristall) einen Radikalgehalt von 72% (bezogen auf 2) auf. 2 und das früher beschriebene Dinaphtho-[2.3-c : 2′.3′-h]phenothiazinyl1) (5) zeigen charakteristische UV-Spektren.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050407
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  • 5
    Electronic Resource
    Electronic Resource
    Inhaltsstoffe des Rauschpfeffers, V. 11-Hydroxy-12-methoxy-dihydrokawain und 11.12-Dimethoxydihydrokawain, zwei neue Kawa-Lactone aus Rauschpfeffer (Piper methysticum Forst.) (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 2182-2187 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Constituents of Piper methysticum Forst., V. 11-Hydroxy-12-methoxydihydrokawain and 11.12-Dimethoxydihydrokawain, two new Kawa-Lactones from Piper methysticum Forst.Chromatographic separation of the methanolic extract from kawa-roots yielded two new lactones, which were shown to have the structures 1 and 2.
    Notes: Die chromatographische Untersuchung des methanolischen Extraktes der Kawa-Wurzel führte zur Isolierung der neuen Kawa-Lactone 1 und 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050711
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  • 6
    Electronic Resource
    Electronic Resource
    Notiz über den Phenothiazin- und Carbazolringschluß von 2.7-Bis-β-naphthylamino-naphthalin (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3495-3499 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721051038
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  • 7
    Electronic Resource
    Electronic Resource
    Röntgenstrukturanalyse des Bis-[10-methyl-acridin-(9)]-monoaza-monomethincyanin-perchlorats (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 203-216 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: X-Ray Crystal Structure Analysis of Bis(10-methyl-9-acridine)monoazamonomethinecyanine PerchlorateThe structure analysis of the title compound is described and its molecular and crystal structure discussed. The space group is P212121 with lattice parameters a = 19.765, b = 13.945, c = 8.436 Å, and 4 formula units per unit cell. Steric hinderance in the cation leads to a compromise between rotation of the ring systems (65.5°) and an increase in bond angles. The bond angle at the central nitrogen for example is 136.5°. PPP-Calculations have been carried out for the dyestuff cation. The u. v. spectrum of the crystal is compared with that of the solution. The space group is acentric containing only one of the two enantiomers, whereas the solution is racemic.
    Notes: Die Röntgenstrukturanalyse des Bis-[10-methyl-acridin-(9)]-monoazamonomethincyanin-perchlorats wird beschrieben und die Molekül- und Kristallstruktur diskutiert. Raumgruppe: P212121, a = 19.765, b = 13.945, c = 8.436 Å mit 4 Formeleinheiten pro Elementarzelle. Die sterische Hinderung im Kation führt zu einem Kompromiß zwischen Verdrillung der Teilsysteme (65.5°) und Aufweitung von Winkeln (z. B. am zentralen Stickstoff 136.5°). Außerdem wurden am Farbkation PPP-Rechnungen durchgeführt. Ein UV-Kristallspektrum ist einem Lösungsspektrum gegenübergestellt. Die Raumgruppe ist azentrisch und führt daher zum Einbau gleicher optischer Antipoden aus einer racemischen Lösung.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050123
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  • 8
    Electronic Resource
    Electronic Resource
    Tautomerie von Heterocyclen, I. Über die Tautomerie von “4-Chinazolylthioharnstoffen” und verwandter Verbindungen (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 471-483 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tautomerism of Heterocyclic Compounds, I. The Prototropic Tautomerism of “4-Quinazolylthioureas” and Related CompoundsThe prototropic tautomerism and hydrogen-bonding interactions of 4-quinazolylthioureas, -thioamides and a thiocarbamic acid ester are studied by spectroscopic methods (i. r. and n. m. r.). In case of thiocarbamic acid ester both tautomeric forms (10 and 11) can be isolated as crystalline solids.
    Notes: Die Tautomerieerscheinungen und Wasserstoffbrückenbeziehungen bei 4-Chinazolylthioharnstoffen, -thioamiden und einem -thiourethan werden IR- und NMR-spektroskopisch untersucht. Im Falle des Thiourethans können beide Tautomeren (10 und 11) in Substanz isoliert werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060213
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  • 9
    Electronic Resource
    Electronic Resource
    Notiz über eine neue Methode zur Darstellung von 1.3-Dimethyl-uracil-carbonsäure-(5) (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 2095-2097 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050635
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Kenntnis des Triselenadiborolan-Systems (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1012-1018 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Triselenadiborolane SystemSeveral methods for the synthesis of triselenadiborolanes (R-B)2Se3 (1-6) are described, and the formation and structure of the five-membered ring are discussed. The reaction of R2B-X (X = J, H) with selenium or dicyclopentadienyltitanium pentaselenide yields the hitherto unknown diboryldiselenanes, which decompose thermally to form the five membered ring, selenium and R3B. Replacement of the Se2 bridge in the ring by N,N'-dimethyl-hydrazine leads to a new boron-nitrogen-selenium heterocycle (9, 10).
    Notes: Es werden mehrere Darstellungsmethoden für Triselenadiborolane (R-B)2Se3 (1-6) be-schrieben sowie die Bildung und Struktur des Fünfringes diskutiert. Bei Umsetzungen von R2B-X (X = J, H) mit Selen bzw. mit Dicyclopentadienyltitanpentaselenid entstehen die bisher unbekannten Diboryldiselenane R2B-Se-Se-BR2, welche thermisch in den Fünf-ring, Selen und R3B zerfallen. Substitution der Se2-Brücke im Ring durch N,N'-Dimethylhydrazin führt zu einem neuartigen Bor-Stickstoff-Selen-Heterocyclus (9, 10).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060335
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