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  • Chemistry  (91)
  • General Chemistry  (38)
  • 61.70  (3)
  • 11
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 409 (1974), S. 137-151 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR Studies on Silylphosphines. II. Effects of Substituents in Silyl- and SilylmethylphosphinesThe influence of the substituents [CH3, H, H3Si, (CH3)3Si] on: chemical shifts of protons and phosphorus nuclei: the 29Si-31P coupling constant; and several proton coupling constants in the nmr spectra of 24 silylphosphines of the series (CH3)xH3-x,Si-PH2, (CH3)xH3-xSi-PHCH3, (CH3)xH3-xSi-P(CH3)2, [(CH3)xH3-xSi]2PH, [(CH3)xH3-xSi]2PCH3, [(CH3)xH3-x,Si]3P has been studied. Empirical methods for the calculation of δ31P and J29Si-31P using bond increments are reported.
    Notes: Es wird der Einfluß der Substituenten [CH3, H, H3Si, (CH3)3Si] auf die chemische Verschiebung der Protonen und der Phosphorkerne sowie auf die 29Si-31P-Kopplungskonstante und auf einige Protonenkopplungen in 24 Silylphosphinen der Gruppen (CH3)xH3-x,Si-PH2, (CH3)xH3-xSi-PHCH3, (CH3)xH3-xSi-P(CH3)2, [(CH3)xH3-xSi]2PH, [(CH3)xH3-xSi]2PCH3, [(CH3)xH3-x,Si]3P anhand der NMR-Spektren untersucht. Es werden empirische Verfahren zur Berechnung von δ31 und J29Si-31P aus Bindungsinkrementen mitgeteilt.
    Additional Material: 6 Ill.
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 428 (1977), S. 222-224 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The LiPH2 ·1 MonoglymeA convenient synthesis of the crystalline LiPH2 · 1 monoglyme is reported by metallating PH3 with n-butyllithium in monoglyme (86% yield relative to n-butyllithium). LiPH2 · 1 monoglyme is stable at room temperature and reasonably soluble in thf, mono-, di-, and triglyme. On pumping (oil pump) it decomposes to “Li2PH” liberating PH3 and monoglyme. “Li2PH” is insoluble in the above mentioned solvents.
    Notes: Es wird die präparative Darstellung von kristallinem LiPH2 · 1 Monoglym (Monoglym = Äthylenglykoldimethyläther) durch Metallierung von PH3 mit n-Butyl-Lithium in Monoglym beschrieben (Ausbeute 86% bezogen auf Lithiumbutyl).LiPH2 · 1 Monoglym ist bei Raumtemperatur beständig und gut löslich in THF, Monoglym, Diglym und Triglym. Beim Abpumpen (Ölpumpe) geht es unter Abgabe von PH3 und Monoglym in “Li2PH” über, das in den genannten Lösungsmitteln nicht löslich ist.
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 552 (1987), S. 50-68 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Phosphido Complexes. XIV. P-Functional Phosphido-Bridged Heterobimetallic Complexes with and without a Metal-Metal Bond; PH2-Bridged cp(CO)xFe-DerivativesCleaving both Si—P bonds in the complexes cp(CO)2[μ-P(SiMe3)2]M′Lm 1 (M′Lm = Co(CO)2(NO) b, Fe(CO)(NO)2 c Mn(NO)3 d, Cr(CO)5 f, Mo(CO)5 g, W(CO)5 h, Mncp(CO)2 i, MnMecp(CO)2 j, Crcp(CO)(NO) k, Vcp(CO)3 l) using CH3OH, H2O or CH3COOH, respectively, gives the PH2-bridged bimetallic complexes cp(CO)2Fe(μ-PH2)M′Lm 2b-d and 2f-l. The complexes H3PM′Lm 4e, 4f, 4j (M′Lm = Fe(CO)4 e) which can be obtained reacting the P-silylated derivatives (Me3Si)3PM′Lm with CH3OH can be transformed into LiH2PM′Lm 5e, 5f, 5j using n-BuLi. 5e, 5f, 5j react with cp(CO)2 FeBr to give 2e, 2f, 2j. The photochemical decarbonylation of 2b-l leads only in the case of 2i and 2j to isolable complexes containing a metal-metal bond cp(CO)Fe(μ-CO, μ-PH2) M′Lm-1 6 (M′Lm-1 = Mncp(CO) i, MnMecp(CO) j). 6i and 6j as well as 6k (M′Lm-1 = Crcp(NO) k) are also available cleaving both Si—P bonds in cp(CO)Fe[μ-CO, μ-P(SiMe3)2]M′Lm-1 8i-k using CH3OH. In other complexes 6 the PH2-bridge causes a labilisation of the metal-metal bond. This can be used in some cases to add ligands under mild conditions. I.R., N.M.R. and mass spectral data are reported.
    Notes: Durch spaltung beider Si—P-Bindungen in den komplexen cp(CO)2Fe[μ-P(SiMe3)2]M′Lm 1 (M′Lm = Co(CO)2(NO) b, Fe(CO)(NO)2 c, Mn(NO)3 d, Cr(CO)5 f, Mo(CO)5 g, W(CO)5 h, Mncp(CO)2 i, MnMecp(CO)2 j, Crcp(CO)(NO) k, Vcp(CO)3 1) mit Ch3OH, H2O bzw. CH3COOH sind die PH2-verbrückten Zweikernkomplexe cp(CO)2Fe(μ-PH2)M′Lm 2b-d und 2f-1 erhältlich. Die Komplexe H3PM′Lm 4e, 4f, 4j, (M′Lm = Fe(CO)4 e), die aus den P-silylierten Derivaten (Me3Si)3PM′Lm 3e, 3f, 3j, durch Umsetzung mit CH3OH zugänglich sind, lassen sich mit n-BuLi in LiH2PM′Lm 5e, 5f, 5j überführen. 5e, 5f, 5j reagieren mit cp (CP)2FeBr zu 2e, 2f, 2j. Die photochemische CO-Abspaltung aus 2b-1 führt nur bei 2i und 2j zu isolierbaren komplexen mit Metall-Metall-Bindung cp(CO)Fe(μ-CO, μ-PH2)M′Lm-1 6 (M′Lm-1 = Mncp(CO) i, MnMecp(CO) j). 6i und 6j sind ebenso wie 6k (M′Lm-1 = Crcp(NO) k) auch durch Spaltung beider Si—P-Bindungen in cp(CO)Fe[μ-CO, μ-P(SiMe3)2]M′Lm-1 8i-k mit CH3OH erhältlich. Bei anderen Komplexen 6 bewirkt die PH2-Brücke eine Labilisierung der Metall-Metall-Bindung. Dies läßt sich in einigen Fällen zur Addition von Liganden unter milden Bedingungen ausnutzen. NMR-und IR-spektroskopische sowie massenspektrometrische Daten werden mitgeteilt.
    Additional Material: 4 Tab.
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  • 14
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 485-485 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 15
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 494-495 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 17
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 516-522 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Reactions of 2-Mercapto-6-thioxo-thiopyran-3-carboxylate derivatives6-Amino-thiopyran-2-thiones (1) react with dihydrogen sulfide in the presence of pyridine and triethyl amine to yield 6-thioxo-thiopyran-2-thiolates (2). Methylation of 2 gives the methylthio compounds 3 and 4. Further methylation of 3a and 4a yields the thiapyrylium salt (7). The reaction of 2-imino-thiopyran (6) with carbon disulfide represents another route to the 6-methylthio-thiopyran-2-thione (4a). The 2-methylthio-thiopyran-6-thione (3a) undergoes substitution of the methylthio group with amines to 8 or reacts with phenylhydrazine to phenylhydrazono-thiopyrane (9c). 6-Thioxo-thiophen-2-thiolates (2a,b) react with hydrazine hydrate to give hydrazono-thiopyranes (10a,b) which can be S-methylated. On the contrary 2c gives with hydrazine hydrate under ring transformation the pyridine-2-thiolate (11). N,S-Acetals (12) and 1,3,4-thiadiazoles (15), which give rise to new pyridine derivatives (14) and (17), can be obtained from 1-Amino-pyridin-2-thiolate (11).
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  • 18
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 13 (1962), S. 22-29 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The formation of a top layer on steel surfaces by means of the combined oxalic acid'chromic acid methodIn the investigations here described, the attempt has been made to analyze the mechanism of the top layer formation with the combined oxalic acid/chromic acid treatment of steel plates and to interpret the particularly effective corrossion protection obtained by this method. The mechanism of the formation of the oxalate layer and its catalytic acceleration by the so-called “working-in” compound as well as the reaction of the chromic acid with the metal surface are discussed. It is shown that the corrosion protection layer is ultimately obtained by a normal passivation of the metal surface by means of the chromic acid. The specific effect of the pretreatment with oxalic acid is based not only on a direct participation in the formation of the top layer but on a particularly favourable preparation of the surface for the subsequent passivation.
    Notes: In den beschriebenen Untersuchungen wird der Versuch gemacht, den Mechanismus der Deckschichtbildung bei der kombinierten Oxalsäure-Chromsäurebehandlung won Stahlblechen zu analysieren und die nach diesem Verfahren erreichte besonders gute Korrosionsschutzwirkung zu deuten. Der Mechanismus der Oxalatschichtbildung und ihrer katalytischen Beschleunigung durch das sog. Einarbeitungssalz sowie die Reaktion der Chromsäure mit der Oxalatschicht und mit der Metalloberfläche wird erörtert. Es wird gezeigt, daß die Korrosionsschutzschicht letztlich in einer normalen Passivierung der Metalloberfläche durch die Chromsäure entsteht. Die spezifische Wirkung der Oxalsäurevorbehandlung beruht nicht auf einer direkten Beteiligung am Deckschichtenaufbau, sondern auf einer besonders günstigen Vorbereitung der Oberfläche für die anschließende Passivierung.
    Additional Material: 10 Ill.
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  • 19
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 14 (1963), S. 57-57 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 20
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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