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  • Wiley-Blackwell  (45)
  • National Academy of Sciences  (4)
  • 1985-1989  (45)
  • 1935-1939  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Dimere Phospha- und Thiastannylene: Ylidartige Diphospha- und Dithiadistannetane (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1045-1049 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dimeric Phospha- and Thiastannylenes: Ylide-type Diphospha- and DithiadistannetanesBis(di-tert-butylphosphino)tin(II) (1) is obtained from the reaction of potassium di-tert-butyl-phosphide with stannous chloride or with the stannous chloride-triethylphosphane complex. Bis(tert-butylthio)tin(II) (2) is prepared by reaction of (η5-C5H5)2Sn with 2-methyl-2-propanethiol or from stannous chloride and (tert-butylthio)trimethylsilane. In solution, 1 and 2 are PR2-and SR-bridged dimers, respectively. NMR spectra indicate that rapid scrambling of terminal and bridging substituents occurs in 2 but not in the cyclic \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\rm P}\limits^ + - \mathop {\rm S}\limits^{\rm - } {\rm n} $\end{document} ylide 1.
    Notes: Bis(di-tert-butylphosphino)zinn(II) (1) entsteht durch Reaktion von Kalium-di-tert-butylphos-phid mit Zinndichlorid oder dem Zinndichlorid-Triethylphosphan-Komplex. Bis(tert-butylthio)-zinn(II) (2) wird hergestellt durch Umsetzung von (η5-C5H5)2Sn mit 2-Methyl-2-propanthiol und entsteht auch bei der Reaktion von Zinndichlorid mit (tert-Butylthio)trimethylsilan. 1 und 2 liegen in Lösung als PR2- bzw. SR-verbrückte Dimere vor. Kernresonanzspektren zeigen, daß bei dem cyclischen \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\rm P}\limits^ + - \mathop {\rm S}\limits^{\rm - } {\rm n} $\end{document}-Ylid 1 im Gegensatz zu 2 auch in Ethern keine raschen Platzwechselvorgänge (Brücke/terminal) ablaufen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180321
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  • 2
    Electronic Resource
    Electronic Resource
    Eigenschaften von Tellur-Tellur-Bindungen, VI. Struktur und Barriere der Enantiomerenumwandlung von Bis(2,4,6-tri-tert-butylphenyl)ditellan (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 11-14 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Properties of Tellurium-Tellurium Bonds, VI.  -  Structure and Barrier of Interconversion of Enantiomeric Conformations of Bis(2,4,6-tri-tert-butylphenyl)ditellaneOxidation of lithium (2,4,6-tri-tert-butylphenyl)telluride provides red and strong refractive needles of bis(2,4,6-tri-tert-butylphenyl)-ditellane (1) which crystallize monoclinically in the space group C2/c. The bond distance d(Te-Te), the bond angle at the Te atoms, and the torsion angle at the Te-Te bond were found to be 271.3 pm, 100.6°, and 92.1°, respectively. The C2 symmetry of the molecule gives rise to different chemical surroundings for both tert-butyl groups in ortho position belonging to the aryl groups. This effect can also be observed in solution at low temperatures. For the first time, dynamic NMR spectroscopy succeeded in determination of the barrier of rotation about a Te-Te bond. This barrier was found to be 40.9 kJ · mol-1 and is 20% less than that in the corresponding diselane.
    Notes: Bis(2,4,6-tri-tert-butylphenyl)ditellan (1) wird durch Oxidation von Lithium-(2,4,6-tri-tert-butylphenyl)tellurid in Form roter, stark lichtbrechender Kristalle erhalten. 1 kristallisiert monoklin in der Raumgruppe C2/c. Der Bindungsabstand d(Te-Te) beträgt 271.3 pm, der Bindungswinkel an den Te-Atomen 100.6° und der Torsionswinkel an der Te-Te-Bindung 92.1°. Durch die C2-Symmetrie besitzen die beiden ortho-ständigen tert-Butylgruppen der Substituenten unterschiedliche chemische Umgebung, die auch in Lösung bei tiefen Temperaturen erkennbar wird. Aus NMR-spektroskopischen Daten gelang erstmals die Bestimmung der Rotationsbarriere um eine Te-Te-Bindung; sie beträgt 40.9 kJ · mol-1. Dieser Wert ist um 20% kleiner als für das entsprechende Diselan.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881210103
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  • 3
    Electronic Resource
    Electronic Resource
    Eigenschaften von Chalkogen-Chalkogen-Bindungen, XI. Iod[tris(trimethylsilyl)methyl]selan: Synthese des ersten Alkylselenenyliodids (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 2109-2110 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Iodo[tris(trimethylsily)methyl]selane: Synthesis of the First Alkylselenenyl IodideBis[tris(trimethylsilyl)methyl]diselane (1) reacts with elemental iodine to provide iodo[tris(trimethylsilyl)methyl]selane (2) in high yield. 2 is the first iodoselane that does not suffer from redismutation equilibria in solution at ambient temperature with iodine and the parent diselane.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881211206
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung von cis-Dichloro[tellurobis(di-tert-butyl-phosphan)]platin(II) (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 5016-5017 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of cis-Dichloro[tellurobis(di-tert-butylphosphane)]platinum(II)The title complex 2 is obtained in 50-60% yield from heterogeneous reactions between tellurobis(di-tert-butylphosphane) (1) and bis(benzonitrile)dichloroplatinum(II) in methylene chloride or platinum dichloride in toluene suspension. NMR and MS data are consistent with a chelate-type Cl2Pt(tBu2P)2Te structure of the new complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181233
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  • 5
    Electronic Resource
    Electronic Resource
    Vierring-Chelatkomplexe von Tellurobis(di-tert-butylphosphan) mit Tetracarbonylmetall (VIA)-Acceptoren (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1580-1587 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Four-membered Chelate Complexes of Tellurobis(di-tert-butylphosphane) with Tetracarbonylmetal (VI A) AcceptorsTellurobis(di-tert-butylphosphane) (1) reacts with tetracarbonyl(norbornadiene)chromium(0) and -molybdenum(0) with formation of norbornadiene and the new chelate complexes (CO)4M-[P-t-Bu2)2)Te] 2 (M = Cr) and 3 (M = Mo). The corresponding tungsten complex 4 (M = W) is obtained from 1 with the acetonitrile complexes W(CO)6-n(CH3CN)n (n = 2,3). The sulfur ylide complex (CO)4Cr[CH2S(O)(CH3)2]2 reacts with 1 to provide 2 and with methylenebis(di-tert-butylphosphane) (6) to the four-membered chelate complex (CO)4Cr[P-tBu2)2CH2] (8). Spectroscopic data like IR, MS and NMR and the X-ray crystal structure analysis of the chromium complex 2 provide evidence for the function of 1 as rather bulky bidentate ligand in the chelate complexes 2-4.
    Notes: Tellurobis(di-tert-butylphosphan) (1) reagiert mit Tetracarbonyl(norbornadien)chrom(0) und -molybdän(0) unter Verdrängung von Norbornadien zu den Chelatkomplexen (CO)4M[P-t-Bu2)2 Te] 2 (M = Cr) und 3 (M = Mo). Der entsprechende Wolframkomplex 4 (M = W) wird durch Umsetzung von 1 mit dem Acetonitrilkomplexgemisch W (CO)6-n(CH3CN)n (n = 2, 3) erhalten. 2 entsteht auch bei der Umsetzung von 1 mit dem Schwefelylid-Komplex (CO)4Cr[CH2S(O)(CH3)2]2. Methylenbis(di-tert-butylphosphan) (6) gibt unter gleichen Bedingungen den Vierring-Chelatkomplex (CO)4Cr[P-t-Bu2)2CH2] (8). Spektroskopische Daten (IR, MS, NMR) sowie die Kristallstrukturanalyse von 2 belegen die Funktion von 1 als sehr sperrigem zweizähnigem Phosphorliganden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180425
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  • 6
    Electronic Resource
    Electronic Resource
    Tellurierung und Selenierung von Tetra-tert-butyldiphosphan (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 37-41 
    Details
    ISSN: 0009-2940
    Keywords: Diphosphane, tetra-tert-butyl- ; Diselenide, bis(di-tert-butylselenophosphinyl) ; Phosphinic and phosphinous anhydrides ; Selenation ; Telluration ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Telluration and Selenation of Tetra-tert-butyldiphosphaneTetra-tert-butyldiphosphane (1) reacts with tellurium in boiling toluene to provide di-tert-butyltellurophosphinous anhydride (2) in high yield. Similarly, selenium inserts into the P—P bond of 1, but subsequently di-tert-butylselenophosphinous anhydride (3) adds another selenium atom with formation of a P=Se bond in tBu2PSeP(=Se)tBu2 (4). Pure 3 is obtained from di-tert-butylchlorophosphane and sodium selenide at 100°C. Oxidation of 3 provides the μ-selenophosphinic anhydride [tBu2P(=O)]2Se (7), which was characterized by an X-ray structure analysis. Reaction of 1 with three equivalents of selenium or reaction of 4 with one equivalent of selenium leads to mixtures that contain 4, [tBu2P(=Se)]2Se (5), and [tBu2P(=Se)]2Se2 (6). With excess of selenium, 6 was obtained in high yield. The course of telluration and selenation reactions and the structures of 2-7 were confirmed with help of 1H- and 31P-NMR and mass spectra.
    Notes: Tetra-tert-butyldiphosphan (1) wird durch Erhitzen mit elementarem Tellur in hoher Ausbeute in Di-tert-butyltellurophosphinigsäureanhydrid (2) übergeführt. Bei der Umsetzung von 1 mit Selen schließt sich der Selen-Einschiebung in die P—P-Bindung die Selenierung einer Phosphingruppe in Di-tert-butylselenophosphinigsäureanhydrid (3) zur Selenophosphinylfunktion in tBu2PSeP(=Se)tBu2 (4) an. Reines 3 erhält man durch Einwirkung von Di-tert-butylchlorphosphan auf Natriumselenid bei 100°C. Bei der Oxidation von 3 entsteht das μ-Selenophosphinsäureanhydrid-Derivat [tBu2P(=O)]2Se (7), dessen Struktur röntgenographisch bestimmt wurde. Umsetzung von 1 mit drei Äquivalenten Selen oder Umsetzung von 4 mit einem Äquivalent Selen in siedendem Ether führt zu Gemischen von 4, [tBu2P(=Se)]2Se (6). Verwendet man vier oder mehr Äquivalente Selen, so entsteht 6 in hoher Ausbeute. Reaktionsabläufe und die Konstitution der Verbindungen 2-7 werden insbesondere durch 1H- und 31P-NMR- und Massenspektren gesichert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220107
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  • 7
    Electronic Resource
    Electronic Resource
    A HREM study on molecular images of poly(phthalocyaninatosiloxane) (1988)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 26 (1988), S. 433-439 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1988.140261003
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  • 8
    Electronic Resource
    Electronic Resource
    Organosilane polymers: Formable polymers containing methylsilylene units. and Organosilane polymers: Formable polymers containing reactive side groups (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 4227-4227 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080271228
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  • 9
    Electronic Resource
    Electronic Resource
    Organosilane polymers: Formable polymers containing methylsilylene units (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 2849-2860 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organosilane polymers containing methylsilylene units were prepared by sodium condensation of MeHSiCl2 alone or with R1R2SiCl2 (R1 and R2 = alkyl, aryl, or aralkyl) in a blend of toluene and dioxane followed by fast filtration under N2. These polymers are readily soluble in common solvents and can be drawn into fibers or formed into films by molding, casting, or potting. They can be crosslinked by oxidation, irradiation, or hydrosilylation of vinylsilane in the presence of platinum complexes. The effect of the quantity of MeHSiCl2 on molecular weights of copolymers was also discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080270902
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  • 10
    Electronic Resource
    Electronic Resource
    Organosilane polymers: Formable polymers containing reactive side groups (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 2861-2869 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Formable organosilane polymers containing various reactive side groups were synthesized by hydrosilylation of unsaturated compounds containing reactive groups with poly(methylsilane) in the presence of platinum complexes. These polymers have appreciable solubility in common solvents, can be molded or cast into films or drawn into fibers, and are photoactive.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080270903
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