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  • Chemistry  (107)
  • High-pressure chemistry  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Die entscheidende Mitwirkung der Metall- und Sauerstoffionen von Nickeloxid beim Ablauf der Oxidation von o-Xylol (1995)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 109-112 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Decisive Cooperation of Metal and Oxygen Ions of Nickel Oxide During the Oxidation of o-XyleneAs can be concluded from the experimental results at 450°C in the reaction mixtures consisting of N2—O2-o-Xylene, both nickel oxide pure and doped with Li2O or In2O3 is unsuited as catalyst for the oxidation of o-xylene to phthalic anhydride. In contrast to NiO which ionosorbs both oxygen and o-xylene, NiO—Li2O, a strong ionosorbent for o-xylene, prevents the ionosorption of oxygen because of the large concentration of holes. Since gaseous oxygen does not react with ionosorbed o-xylene but a reduction of nickel oxide to metallic nickel has been observed in spite of the fact of enough oxygen in the gas phase it can be assumed that o-xylene is forced to remove oxygen ions from the NiO lattice under generation of oxygen-ion vacanxies and nickel atoms. The predominant portions of the reaction products are H2O and CO2. With undoped nickel oxide and NiO—In2O3 which were not reduced under the same experimental conditions, the reaction products had roughly the same composition.The reduction of NiO—Li2O however will be prevented in a gas mixture with a high oxygen pressure which oxidizes the formed nickel atoms on the surface of NiO—Li2O to nickel oxide making possible the entrance of oxygen from the gas phase and, therefore, the oxidation of o-xylene.A turbulent motion of a 2-component catalyst powder from NiO-1mole% Li2O covered with ionosorbed o-xylene and ZnO-1mole% In2O3 covered with ionosorbed oxygen in the same gas mixture resulted in the same reaction products as in the presence of sole NiO—Li2O under simultaneous reduction of nickel oxide. From that we can conclude that the oxidation of o-xylene by oxygen ions of NiO occurs more easily than the reaction with ionosorbed oxygen on ZnO—In2O3 which obviously seems to be bounded too strongly. This result is also confirmed by the prevention of the oxidation of gaseous o-xylene in the presence of only ZnO—In2O3.Finally, the operation of the carrier catalyst V2O5/TiO2 which is employed for the oxidation of o-xylene to phthalic anhydride will be prevented to a large extent in simultaneous presence of nickel oxide either pure or doped with Li2O and In2O3 in roughly the same amount. This result can be mentioned as a proof for the interaction of a 2-component catalyst the mechanism of which is at present not satisfactorily understood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19953370125
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  • 2
    Electronic Resource
    Electronic Resource
    Schwefel - Stickstoff - Fluorverbindungen VI. Über Thioisodithiazylfluorid S3N2F2 (1959)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 298 (1959), S. 72-77 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In addition to the formation of S4N4, greenish-yellow crystal sheets of S3N2F2 are deposited from a mixture containing SN2F2 and SNF at pressures form 600 to 700 mm Hg. S3N2F2 crystallizes in two polymorphic forms; the melting and decomposition points are 85 and 95 - 97° Cm, respectively; solubility in CCl4 at 20°C: 1.5 grs./100 grs. The observed formation of S3N2F2 is discussed in respect to the tendency of stable S—F-bond formation.
    Notes: Aus einem Gemisch von SN2F2 und SNF scheidet sich bei Drucken von 600 bis 700 Torr an der Wand des Reaktionskolbens ein gelber Beschlag ab, während gleichzeitig grüngelbe Kristallblättchen ins Innere des Kolbens wachsen. Bei letzteren handelt es sich um S3N2F2, das in zwei polymorphen Kristallarten auftritt. Fp. 85°C; Zers.-Pkt. 95-97°C. Löslichkeit in CCl4: 1,5 g/100 g bei 20°.Aus dem gelben Wandbeschlag wird durch Dekantieren mit Acetonitril S4N4 erhalten. Die Bildung von S3N2F2 wird diskutiert und festgestellt, daß die Tendenz zur Bildung stabiler S—F-Bindungen als Ursache für die Zersetzung von SN2F2 + SNF angesehen werden kann.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19592980111
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  • 3
    Electronic Resource
    Electronic Resource
    Trennung von Zirkonium und Hafnium durch Extraktion als substituierte Ammoniumchlorometallate (1962)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 316 (1962), S. 105-116 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zr(IV)- and Hf(IV)-compounds form in hydrochloric acid chloroacids which can be extracted from the inorganic phase by means of amines solved the organic solvents (e.g. by means of tribenzyl amine in CHCl3). The partition coefficient of zirconium is greater than that of hafnium; separation factors of 10--20 can be achieved.By this new method, Zr- and Hf-compounds having only low contents of the other metal (below 0.01% Hf and Zr, resp.) have been prepared in larger scale by continuous and multistage separation technics.
    Notes: Zirkonium(IV)- und Hafnium(IV)-Verbindungen bilden in halbkonzentrierter bis konzentrierter Salzsäure Chlorometallsäuren, die durch Lösungen organischer Amine in organischen Lösungsmitteln, z. B. mit Tribenzylamin in Chloroform, aus der anorganischen Phase extrahiert werden können, wobei die Verteilungskoeffizienten des Zirkoniums größer als die des Hafniums sind. Trennfaktoren der Größenordnung 10-20 sind leicht zu erreichen. An Beispielen wird gezeigt, daß nach dem neuen Verfahren aus handelsüblichen Produkten hafniumarme Zirkonium- (Hafniumgehalt unter 0,01%) wie auch zirkoniumarme Hafniumverbindungen (Zirkoniumgehalt unter 0,01%) gewonnen werden können und zwar sowohl in größerem Maßstab durch kontinuierliche und multiplikative Verteilung als auch in kleineren Mengen im Laboratorium ohne apparativen Aufwand.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19623160112
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  • 4
    Electronic Resource
    Electronic Resource
    Über die Löslichkeit von Lithiumnitrid, Calciumnitrid und Calciumsulfid in geschmolzenen Salzen (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 332 (1964), S. 257-262 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The nitrides of lithium and calcium as well as calcium sulfide are easily dissolved several molten salts of alkali and alkaline-earth metals. The best solvents are lithium salts and their mixtures. The dependence on the temperature of the solubilities in various solver has been measured.
    Notes: Die Nitride von Lithium und Calcium sowie Calciumsulfid sind in einer Reihe Alkali- und Erdalkalisalzen löslich. Größtes Lösungsvermögen zeigen Lithiumsalze und deren Mischungen. Die Abhängigkeit der Löslichkeit von der Temperatur in den verschiedenen denen Lösungsmitteln wird bestimmt, und die Ergebnisse werden diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643320506
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  • 5
    Electronic Resource
    Electronic Resource
    Dampfdrucke von SeO2, CrO3 und Re2O7 (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 333 (1964), S. 25-28 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Using the transport reaction method, the vapour pressures of SeO2 at 420 〈 T 〈 492 °K, CrO3 at 448 〈 T 〈 468 °K and Re2O7 at 413 〈 T 〈 478 °K have been determined. Vapour pressure equations and thermodynamic data are communicated.
    Notes: Mit Hilfe der Mitführungsmethode werden die Dampfdrucke von SeO2 (420 〈 T (°K) 〈 492), CrO3 (448 〈 T (°K) 〈 468) und Re2O7 (413 〈 T (°K) 〈 478) bestimmt. Die Dampfdruckgleichungen und thermodynamischen Daten sind angegeben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643330105
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  • 6
    Electronic Resource
    Electronic Resource
    Gasförmige Hydroxide. IX. Über ein Gasförmiges Hydroxid des RheniumsProfessor Paul Royen zum 60. Geburtstage am 17. Dezember 1964 gewidmet. (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 334 (1964), S. 21-26 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The heterogeneous equilibrium Re2O7(s) + H2O(g) ⇄ 2 ReO3(OH)(g) has been investigated in the temperature region from 163 to 220 °C. Thermodynamical data are communicated.
    Notes: Das heterogene Gleichgewicht zwischen Re2O7(fest) und H2O(gas), im Temperaturbereich von 163-220°C untersucht, wird nach den Meßergebnissen formuliert gemäß Re2O7(fest) + H2O(gas) ⇌ 2 ReO3(OH)(gas).Die thermodynamischen Daten werden mitgeteilt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643340105
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  • 7
    Electronic Resource
    Electronic Resource
    Reaktionen perfluorierter Carbonsäureamide und -hydrazide mit Phenyltetrafluorphosphoran und Bortrifluorid (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 394 (1972), S. 26-32 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Products of the reactions between CF3CONH2 and C3F7CONH2 with Phenyltetrafluorophosphorane, C6H5PF4, are CF3CON = PF2C6H5 (1) and C3F7CON = PF2C6H5 (2). The hydrazide of Trifluoroaceticacid, CF3 CONHN(CH3)2 reacts with C6H5PF4 and BF3 · (C2H5)2O to give Preparation and characterization of these new compounds are given.
    Notes: Als Reaktionsprodukte der Umsetzung von CF3CONH2 und C3F7CONH2 mit Phenyltetrafluorphosphoran, C6H5PF4, entstehen CF3CON = PF2C6H5 (1) und C3F7CON = PF2C6H5 (2). Das Hydrazid der Trifluoressigsäure, CF3CONHN(CH3)2, reagiert mit C6H5PF4 und BF3 · (C2H5)2O zu Die Darstellung und Charakterisierung dieser neuen Verbindungen wird beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723940106
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  • 8
    Electronic Resource
    Electronic Resource
    Über Reaktionen des Bis(trifluormethyl)diazomethan mit SulfonylisocyanatenFrau Professor Margot Becke-Goehring zum 60. Geburtstage gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 299-306 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Reactions of Bis(trifluoromethyl)diazomethane with SulfonylisocyanatesSulfonylisocyanates RSO2NCO (B = F, Cl, CF3) react with (CF3)2CN2 at 100-160°C to give l,2,3-oxathiazole-4-one-2-oxidesWhile the ring IIa is cleaved by methanol (formation of FSO2—NH—C(O)—C(CF3)2OH) with waterThe proton of the compound V might be substituted by metal atoms, especially the silver salt is suitable for the preparation of further 1,2,3-oxathiazoline-4-one-2,2-dioxides.
    Notes: Sulfonylisocyanate RSO2NCO (E = Cl, F, CF3) reagieren mit (CF3)2CN2 bei 100-160°C zu 1,2,3-Oxathiazol-4-on-2-oxidenWährend der Ring IIa mit Methanol gespalten wird (Bildung von FSO2—NH—C(O)— C(CF3)2OH), erhält man bei der Umsetzung mit WasserDas Proton dea Hydrolyseprodukts läßt sich durch Metallatome ersetzen, besonders das Silbersalz eignet sich zur Darstellung weiterer 1,2,3-Oxathiazolin-4-on-2,2-dioxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744060224
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  • 9
    Electronic Resource
    Electronic Resource
    Neue Amino-Derivate des SchwefelhexafluoridsVortrag auf dem V. Europäischen Fluorsymposium, Aviemore, Schottland (September 1974).Professor Fritz Seel zum 60. Geburtstage am 21. September 1975 gewidmet (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 416 (1975), S. 263-268 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Amino Derivatives of SulfurhexafluorideCompounds of the type SF5—N=S(F)NR2 and SF5—N=S(NR2)2 have been prepared by Si—N bond-cleavage reaction of Silylamines with Pentafluorosulfur-sulfur-difluorideimide 1. With PCl5, SF5—N=SCl2 can be prepared out of 1. The ir, mass and nmr spectra of the new compounds are reported and compared with other SF6 derivatives.
    Notes: Durch Si—N-Spaltungsreaktion von Pentafluoroschwefelschwefeldi-fluoridimid 1 mit Silylaminen entstehen die Verbindungen SF5—N=S(F)NR2 und SF5—N=S(NR2)2. 1 gibt mit PCl5 SF5—N=SCl2. Die IR-, MS- und insbesondere die NMR-Spektren der neu dargestellten Verbindungen werden mitgeteilt und mit anderen SF6-Derivaten verglichen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754160310
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  • 10
    Electronic Resource
    Electronic Resource
    Reaktionen mit Stickstofftrifluorid. VII. Uber Reaktionen von Stickstofftrifluorid mit Phosphor-Schwefel-Verbindungen und Calciumphosphid (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 409 (1974), S. 163-175 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Nitrogen Trifluoride. VII Reactions of Nitrogen Trifluoride with Phosphor Sulphur Compounds and Calcium PhosphideReactions of NF3 with P4S3, P4S10, are studied by variation of reaction temperature and rate of flow of NF3. Operation in a nickel tube at 328-360°C leads to the main products SPF3 and PF3; in a nickel trap at 180-215°C (NPF2)n (n = 3-9) is formed in good yield (60%) together with PF3 and PF5. At higher temperatures also SPF3, SF4 and SF6 are produced in considerable amounts. Results with calcium and nickel phosphide are presented.
    Notes: Die Reaktionen von NF3 mit P4S3, P4S10 werden unter Variation Reaktionstemperatur und der Strömungsgeschwindigkeit des NF3 studiert. Die Umsetzungen im Nickelrohr ergeben bei 328-360°C als Hauptprodukte SPF3 und PF3, der Nickelfalle entstehen bei 180-215°C in guter Ausbeute (NPF2), (n = 3-9) (60%) sowie PF3 und PF5. Bei höheren Temperaturen treten daneben noch SPF3, SF4 und SF6 in größeren Mengen auf. Ergebnisse mit Calcium- und Nickelphosphid sind rnit aufgeführt.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744090205
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