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  • 1
    Electronic Resource
    Electronic Resource
    Eine neue methode zur herstellung von hydroxyterminierten polydienen (1990)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 174 (1990), S. 69-80 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: It is shown, that hydroxyterminated polydienes of good microstructure and functionality and a narrow molecular weight distribution can be prepared using di-hydroxyethyl-azo-bis-isobutyramide as an initiator. The activation energy of the initiator decay has been determined by volumetric measurement of the nitrogen evolved in this reaction.
    Notes: Es wird gezeigt, daß hydroxyterminierte Polydiene mit guter Mikrostruktur und Funktionalität sowie enger Molekulargewichtsverteilung unter Verwendung von Azobis-isobuttersäure-di-hydroxyethylamid hergestellt werden können. Die Aktivierungsenergie des Initiatorzerfalls wurde durch volumetrische Messung des bei dieser Reaktion freiwerdenden Strickstoffs bestimmt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1990.051740106
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  • 2
    Electronic Resource
    Electronic Resource
    Produktabtrennung bei Alkohol-Fermentationen (1992)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 871-872 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306409153
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  • 3
    Electronic Resource
    Electronic Resource
    Substituierte Alkinyle als axiale Liganden an häminähnlich gebundenem Eisen(III) - Einordnung in eine spektrochemische SerieHerrn Professor Dr. E. Hoyer zum 60. Geburtstag gewidmet (1991)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 333 (1991), S. 423-430 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substituted Alkinyles as Axial Ligands at Hemine Like Bound Iron(III) - Incorporation into a Spectrochemical Series.Substituted lithium alkynyles Li—C≡C—R (R = tBu, Ph, p-Cl—C6H4, Me3Si, iPr3Si, Ph3Si) react with the hemine like macrocyclic iron(III) complex 6,13-di(ethoxycarbonyl)-5, 14-dimethyl-1, 4, 8, 11-tetraazatetradeca-4,6,12,14-tetraenato[2-]iron(III)-iodide (formula 2;) in tetrahydrofuran to form anionic low-spin di-adducts [fe(C≡C—R)2]-. The incorporation of the alkynyles into a spectrochemical series of the axial ligands (studied by the sharp equatorial-ligand-to-metal CT absorption band) results in the wavelength-sequence (nm): OH- (≍ 510) « N3- (≍ 625) 〈 tBu—C≡C- (664) 〈 NH3 (666) 〈 Ph—C≡C- (692) 〈 Ph—NH2 (695) 〈 Me3Si—C≡C- (698) 〈 SCN- (713) 〈 Ph3Si—C ≡ C- (716) 〈 CN- (739) 〈 4-picoline (759) 〈 pyridine (765) 〈 nicotinamide (776) 〈 methylnicotinat (788) 〈 pyrazine (798) and points to a significant π-acceptor ability of the silyl substituents.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19913330307
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  • 4
    Electronic Resource
    Electronic Resource
    P,P′-(2,5-Dihydroxy-3,6-dimethyl-2,5-dioxo-2λ5,5λ5-[1,4,2,5]-dioxadiphosphinan-2,5-diyl)-bis-phosphonsäure (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1799-1804 
    Details
    ISSN: 0044-2313
    Keywords: 1,4,2λ5,5λ5-Dioxadiphosphorinane ; NMR spectra ; Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: P,P′-(2,5-Dihydroxy-3,6-dimethyl-2,5-dioxo-2λ5,5λ5-[1,4,2,5]dioxadiphosphinane-2,5-diyl)-bis-phosphonic AcidThe tetrahydrate 1 of the title compound crystallizes in the monoclinic space group P21/c with a = 845.8, b = 1 098, c = 981.7 pm, β = 113.02° and Z = 2. The anions of the oxonium compound (H3O+ · H2O)2(C4H10O12P42-) are layered by hydrogen bridges. The 1H, 13C and 31P NMR spectra (4 and 5 spin systems) are discussed.
    Notes: C4H12O12P4 · 4 H2O (1), das Tetrahydrat der Titelverbindung, kristallsiert monoklin in der Raumgruppe P21/c mit a = 845,8, b = 1 098, c = 981,7 pm, β = 113,02° und Z = 2. 1 liegt als Oxoniumsalz (H3O+ · H2O)2(C4H10O12P42-) vor, in dem die Anionen über H-Brücken zu Schichten verknüpft sind. Die 4- und 5-Spinsysteme der 1H-, 13C- und 31P-NMR-Spektren werden detailliert analysiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946201023
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  • 5
    Electronic Resource
    Electronic Resource
    Dimethyldithiocarbamatoarsane und -stibane (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 539-544 
    Details
    ISSN: 0044-2313
    Keywords: Ionic arsen- and antimony(III)-dithiocarbamates ; synthesis ; vibrational and mass spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dimethyldithiocarbamatoarsanes and -stibanesThe Halogeno-bis(dimethyldithiocarbamato)-compounds (dtc)2AsCl 1, (dtc)2AsBr 2, (dtc)2AsI 3 and (dtc)2SbI 4 are prepared from (dtc)3As and (dtc)3Sb resp. Reaction of 1 to 4 with CF3SO3Sime3 yields the ionic compounds (dtc)2As+CF3SO3- 5 and [(dtc)2El+]2Hal-(CF3SO3-) · CH2Cl2 6 (El = As; Hal = I), 7 (El = Sb; Hal = I) and 8 (El = As; Hal = Br) resp. by elimination of me3SiHal. The mass spectra and the main fragmentation from 1 to 8 are reported. The vibrational spectra of these compounds, of As(dtc)3, Sb(dtc)3 and of the antimony compounds which are corresponding to 6 and 8 are discussed.
    Notes: Die Synthese der Halogeno-bis(dimethyldi-thiocarbamato)-Verbindungen (dtc)2AsCl 1, (dtc)2AsBr 2, (dtc)2AsI 3 und (dtc)2SbI 4 aus (dtc)3As bzw. (dtc)3Sb wird beschrieben. Umsetzungen von 1 bis 4 mit CF3SO3Sime3 führen unter me3SiHal-Abspaltung zu den salzartigen Verbindungen (dtc)2As1CF3SO3 5 bzw. [(dtc)2El1]2Hal (CF3SO3) · CH2Cl2 6 (El = As; Hal = I), 7 (El = Sb; Hal = I) und 8 (El = As; Hal = Br). Die Massenspektren und die Hauptzerfallswege von 1 bis 8 werden mitgeteilt. Die Schwingungsspektren von 1 bis 8, As(dtc)3, Sb(dtc)3 sowie den 6 und 8 entsprechenden Antimonverbindungen werden diskutiert.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200326
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  • 6
    Electronic Resource
    Electronic Resource
    Antimon(III)-butoxo-Verbindungen (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 609 (1992), S. 35-38 
    Details
    ISSN: 0044-2313
    Keywords: Antimony(III)-butoxo compounds ; syntheses ; vibrational spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Antimony(III)-butoxo CompoundsTri(tert.-butoxo)stiban 1 reacts with antimony(III) chloride dependent from the molar ratio to yield Sb(OtBu)2Cl 2 and Sb4Cl7O(OtBu)3 3 resp ‥ 3 are discrete molecules with a cage structure. 2 is associated by oxygen bridges. The vibrational spectra of 1-3 are assigned.
    Notes: Tri(tert.-butoxo)stiban 1 reagiert mit Antimon(III)-chlorid in Abhängigkeit von der Stöchiometrie unter Bildung von Sb(OtBu)2Cl 2 bzw. Sb4Cl7O(OtBu)3 3. 3 besteht aus diskreten Molekülen mit Käfigstruktur. 2. ist über O-Brückenbindungen hochassoziiert. Die Schwingungsspektren von 1-3 werden zugeordnet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926090306
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  • 7
    Electronic Resource
    Electronic Resource
    Dimethyldithiocarbamatostibane (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 617 (1992), S. 72-78 
    Details
    ISSN: 0044-2313
    Keywords: Ionic antimony(III)-dithiocarbamates ; syntheses ; structure ; vibrational and mass spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: DimethylaminodithiocarbamatostibanesThe Halogeno-bis(dimethylaminodithiocarbamato)stibanes (dtc)2SbCl 2 and (dtc)2SbBr 3 are prepared from (dtc)3Sb 1. Reaction of 2 and 3 resp. with CF3SO3SiMe3 yields the ionic compounds (dtc)2Sb+CF3SO3-4 and (dtc)2Sb+]2Br-(CF3SO3-) CH2Cl2 5 by elimination of Me3SiHal. The molecular structure of 4 is determined by X-ray analysis. The vibrational and mass spectra of 1-5 are reported and briefly discussed.
    Notes: Die Synthese der Halogeno-bis(dismethylaminodithiocarbamato)stibane (dtc)2SbCl 2 und (dtc)2SbBr 3 aus (dtc)1 wird beschrieben. Umsetzungen von 2 bzw. 3 mit CF3SO3SiMe3 führen unter Me3SiHal-Abspaltung zu den salzartigen Verbindungen (dtc)2Sb+CF3SO- 3 4 bzw. [(dtc)2Sb+]2Br-(CF3SO3-). CH2Cl2 5. 4 wird röntgenstrukturanalytisch charakterisiert. Die Schwingungs- und Massenspektren von 1-5 werden diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926170111
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  • 8
    Electronic Resource
    Electronic Resource
    Photoreactive Langmuir-Blodgett-Kuhn multilayer assemblies from functionalized liquid crystalline side chain polymers. II. Structural characterization of homo- and copolymers containing azobenzene and phenylbenzoate moieties (1994)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 45 (1994), S. 217-227 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Liquid crystalline side chain polymers containing photoreactive azobenzene chromophores in the dark-adapted trans form and phenylbenzoate groups as co-mesogens have been prepared and investigated as monomolecular layers at the water/air interface and as multilayer assemblies deposited onto solid supports by the Langmuir-Blodgett-Kuhn (LBK) technique. Pressure area isotherms at variable temperatures together with reflection absorption spectra and Brewster angle microscopic pictures have been taken and analyzed (i) to derive information about the structural order and the packing properties of the mesogenic side groups within the monolayers of different homo- and co-polymeric systems and ii) to optimize the conditions for the transfer of the monolayers.The resulting multilayer assemblies were primarily characterized by X-ray reflectometry studies, which yield the film thickness, the electron density modulations indicative of any internal (double) layer periodicity, and two roughness parameters characterizing the substrate/film and the film/air interfaces, respectively. These investigations were complemented by surface plasmon, UV-vis and IR spectroscopic measurements which provided further information as to the optical/structural properties of the samples.It was found that those systems containing only azobenzene side groups (or a high percentage of them) are composed of metastable double layer subunits which can be easily assembled to thicker films even capable of carrying waveguide modes. The azobenzene chromophores forming various types of aggregates have an average tilt angle of 36° relative to the film normal presumably with a broad angular distribution.If the azobenzene mesogens are diluted by phenylbenzoate co-mesogens in the radio 1:2, only the first few dipping cycles show a good monolayer transfer so that only thin multilayer assemblies can be built up. Moreover, all these preparations though deposited in the Y-type mode show no indication of a doublelayer structure in the transferred film, but instead exhibit the so-called mesogen peak with a smectic periodicity corresponding to only a single monolayer. A structural model with interdigitating side groups is proposed to account for these experimental results.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1994.010450313
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