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  • Wiley-Blackwell  (284)
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  • 11
    Electronic Resource
    Electronic Resource
    13C-Angereicherte Monomere zur NMR-Spektroskopie von Polymeren (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 50 (1976), S. 21-41 
    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: Methods for preparation of the following partially 13C-enriched monomers have been checked: Mixture of 1-13C-2-phenylpropene, 3-13C-2-phenylpropene and 2-phenylpropene, 2-(1-13C-phenyl)propene, 2-13-C-butadiene-1,3, 1-13C-butadiene-1,3, 2-13C-methacrylonitrile, 13CN-methacrylonitrile.The degree of 13C-enrichment has been determined by 13C-satellites in the 1H-NMR spectrum and by comparison of the 13C-NMR spectra of the 13C-enriched compound and its corresponding natural abundant species.
    Notes: Ausgetestete Synthesewege für folgende partiell 13C-angereicherte Monomere werden beschrieben: Gemisch aus 1-13C-2-Phenylpropen, 3-13C-2-Phenylpropen und 2-Phenylpropen, 2-(1-13C-Phenyl)-propen, 2-13C-Butadien-1,3, 1-13C-Butadien-1,3, 2-13C-Methacrylnitril, 13CN-Methacrylnitril.Die Dotierungsgrade wurden durch die 13C-Satelliten im 1H-NMR-Spektrum sowie durch Vergleich der 13C-NMR-Spektren der Monomeren mit natürlichem und angereichertem 13C-Gehalt bestimmt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050500104
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  • 12
    Electronic Resource
    Electronic Resource
    Funktionalisierte Kammpolymere: Synthesen, modifizierung und anwendungen (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 223 (1994), S. 165-175 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The present paper deals with the synthesis and modification of functionalized polymers characterized by a special molecular architecture. The reactivity of a functionalized polymer with comb-like structure can be controlled in a significant manner by the crystalline order of the side chains. In contrast, photocrosslinking of comblike polymers containing cinnamic components in the side chains influences the crystallization process. The air drying process of a modified polybutadiene system with comb-like structure was shown to depend sensitively on the side chain order. Enzymatic synthesis of new monomers and polymers is briefly reviewed. The complexing capability of cyclodextrines were used to synthesize polyrotaxanes. Finally, the synthesis of a chiral polymerizable dendrimer containing eight estergroups in the monomer unit is presented.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052230112
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  • 13
    Electronic Resource
    Electronic Resource
    Addition von silylierten Enolen an Benzoylchlorid und Benzaldehyd (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 2518-2520 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Silylierte Enole, wie 2-Trimethylsiloxy-penten-(2)-on-(4) (1),2-Trimethylsiloxy-3-methyl-penten-(2)-on-(4) (11) sowie β-Trimethylsiloxy-crotonsäure-äthylester (2) reagieren mit Benzoylchlorid bzw. Benzaldehyd unter C—C-Verknüpfung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990818
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  • 14
    Electronic Resource
    Electronic Resource
    Abfangreaktionen Kurzlebiger Radikale, VII. Zum stereochemischen Verlauf radikalischer Additionen an konjugierte Diene: Hydrostannierung und Isomerisierung von Pentadien-(1.3) (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 1372-1382 
    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 Short-Life Radicals, VII. The Stereochemical Route of Free-Radical Additions to Conjugated Dienes: Hydrostannation and Isomerization of Penta-1,3-dieneThe radical addition of Me3SnH and Et3SnH to both of the pure stereoisomers of penta-1,3-diene proceeds by a highly stereospecific mechanism, whereby an extremely high configurational stability of the intermediate allyl radicals 9 is indicated. Besides 1,2- and 1,4-adducts small amounts of 4,1-adducts are formed: altogether 6 of the 8 possible isomers 1-8 are obtained. At 80° the cis-diene reacts 2.6 or 2.9 times faster than the trans-isomer. At 20° and 40° only the transoid conformation is involved in the reaction of cis-isomer, whereas in the case of the trans-diene both cisoid and transoid configurations are involved. The attack of organotin radicals at C-4 (that is, at the internal C=C double bond) is much more readily reversible than that at C-l and leads (primarily) to cis-trans-isomerization of the diene; this is highly dependent on the molar ratio of diene to hydride. By means of capillary gas chromatography it was possible to observe each stage of the addition and isomerization processes.
    Notes: Die beiden Stereoisomeren von Pentadien-(1.3) addieren (CH3)3SnH und (C2H5)3SnH radikalisch hochgradig stereospezifisch, woraus eine beträchtliche Konfigurationsstabilität der intermediär auftretenden Allylradikale 9 folgt. Neben 1.2- und 1.4- entstehen wenig 4.1-Addukte, insgesamt 6 der 8 möglichen Isomeren 1-8. Das cis-Dien reagiert bei 80° 2.6 bzw. 2.9 mal schneller als das trans-Isomere. Bei 20° und 40° ist nur die transoide Konformation des cis-Isomeren beteiligt, beim trans-Dien dagegen sowohl cisoide als auch transoide. Der Angriff von Stannylradikalen an C-4, also an der mittelständigen C=C-Gruppe, ist weit stärker reversibel als derjenige am endständigen C-l und bedingt so (hauptsächlich) eine cis-trans-Isomerisierung des Diens. Diese hängt stark vom Molverhältnis Dien : Hydrid ab. Mittels Kapillar-GC konnten Additionen und Isomerisierung in jedem Stadium verfolgt werden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030509
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  • 15
    Electronic Resource
    Electronic Resource
    Empirisches Inkrementsystem für Methylgruppensignale sowie Ringstrombeeinflussung der Protonen-NMR-Spektren methylsubstituierter Biphenylderivate (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 895-903 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Empirical Increment System for Methyl Group Signals and Ringcurrent Effects on Proton NMR Spectra of Methyl-substituted Biphenyls36 methyl group NMR signals of 18 methyl-substituted biphenyl derivates have been analyzed by multiple linear regression analysis to derive 4,4′- and 2,2′-position substitution constants. The influence of the torsional angle Φ on the signals of o-methyl groups increases from -0.095, -0.284, -0.345 to -0.377 ppm for Φ = 58°, 77.5°, 85°, and 90°. These values are in good agreement with the theoretical ringcurrent model of Johnson and Bovey.
    Notes: Von 18 methylsubstituierten Biphenylderivaten werden 36 Methylgruppen-NMR-Signale durch multiple lineare Regressionsanalyse auf 4,4′- und 2,2′-Positions-Substituentenkonstanten analysiert. Der Einfluß des Verdrillungswinkels Φ auf die o-Methylgruppensignale steigt von -0.095, -0.284, -0.345 auf -0.37 ppm für Φ = 58°, 77.5°, 85° und 90°. Diese Werte werden am besten durch das theoretische Ringstrommodell von Johnson und Bovey wiedergegeben.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170304
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  • 16
    Electronic Resource
    Electronic Resource
    Die Komplexchemie niederer Schwefeloxide, II. Schwefelmonoxid und Dischwefeldioxid als Komplexliganden (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3008-3013 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Complex Chemistry of Lower Sulfur Oxides, II. Sulfur Monoxide and Disulfur Dioxide as Complex LigandsThe sulfur oxides SO and S2O2, unstable under normal conditions, can act as complex ligands in [{C6H5)2PCH2CH2P(C6H5)2}2Ir(SO)2]Cl. The synthesis is achieved by oxidation of cis-[{(C6H5)2PCH2CH2P(C6H5)2}2Ir(S2)]Cl with sodium periodate. The complex forms two modifications, recognizable from the number of the v(SO) frequences in the i.r. spectrum. One of the modifications, containing disulfur dioxide as a ligand, was investigated by an X-ray structure analysis. trans Position of two single SO groups is supposed in the other modification. From this compound the SO molecules can be eliminated by (C6H5)3P as (C6H5)3P=O and (C6H5)3P=S with formation of [{(C6H5)2PCH2CH2P(C6H5)2}2Ir]Cl.
    Notes: Die unter Normalbedingungen instabilen Schwefeloxide SO und S2O2 können in [{C6H5)2PCH2CH2P(C6H5)2}2Ir(SO)2]Cl als Komplexliganden auftreten. Die Synthese erfolgt durch Oxidation von cis-[{(C6H5)2PCH2CH2P(C6H5)2}2Ir(S2)]Cl mit Natriumperjodat. Der Komplex bildet zwei Modifikationen, erkennbar an der Zahl der v(SO)-Schwingungen im IR-Spektrum. Von einer Modifikation, die das Dischwefeldioxid als Liganden enthält, wurde eine Röntgenstrukturanalyse durchgeführt. In der anderen Modifikation wird trans-Stellung zweier SO-Gruppen vermutet. Aus dieser Verbindung lassen sich die SO-Moleküle mittels (C6H5)3P als (C6H5)3P=O und (C6H5)3P=S unter Bildung von [{(C6H5)2PCH2CH2P(C6H5)2}2Ir]Cl entfernen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080921
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  • 17
    Electronic Resource
    Electronic Resource
    Über α-halogenierte Amine, XXXI. Notiz über Trialkyl-halogenmethyl-ammoniumhalogenide und ihre thermische Spaltung (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 2018-2020 
    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.19711040643
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  • 18
    Electronic Resource
    Electronic Resource
    Zur Kenntnis organischer Lewis-Säuren, 34. Die thermische [4π + 2π]-Cycloaddition von Enolethern an 1,1-dicarbonylsubstituierte Ethene (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 1020-1032 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organic Lewis Acids, 341. Thermal [4π + 2π]-Cycloaddition of Enol Ethers to 1,1-Dicarbonyl Substituted EthenesEnol ethers such as ethyl vinyl ether and 1,1-dimethoxyethene (3f) react thermally, in some instances below 0°C, with cyclic 2-alkylidene-1,3-dicarbonyl compounds such as 1 and 2 to give [4π + 2π]-cycloadducts 4 and 5, respectively (cyclic enol acetals and enol orthoesters), and with 1,1-dicyanoethenes 6 to give [2π + 2π]-cycloadducts 7. On passing from toluene to acetonitrile as the solvent, rates of formation of 4bf from 1b and 3f increase about tenfold and those of 7b from 6b and 3f about sixfold. A discussion of these rates, including rates of related reactions, the relative Lewis acid strengths of 1b and 6b, and the behaviour of 1b/3f towards methanol leads to the conclusion that the degree of concert of the formation of 4bf is below 6.5 kJ · mol-1. - The configurations and conformations of adducts 4 and 5 are discussed.
    Notes: Enolether wie Ethylvinylether und 1,1-Dimethoxyethen (3f) bilden mit exocyclisch 1,1-dicarbonylsubstituierten Ethenen wie 1 und 2 z.T. schon unterhalb von 0°C thermisch die [4π + 2π]-Addukte 4 bzw. 5 (cyclische Enolacetale und Enolorthoester) und mit den 1,1-Dicyanethenen 6 die [2π + 2π]-Addukte 7. Die Bildungsgeschwindigkeit von 4bf aus 1b und 3f steigt auf etwa das Zehnfache und die von 7b aus 6b und 3f auf etwa das Sechsfache beim Übergang von Toluol auf Acetonitril als Lösungsmittel. Eine Diskussion dieser Bildungsgeschwindigkeiten unter Einbeziehung verwandter Reaktionsgeschwindigkeiten sowie der relativen Lewis-Säurestärken von 1b und 6b und des Verhaltens des Systems 1b/3f gegenüber Methanol führt zum Schluß, daß der energetische Konzertiertheitsgrad der Bildung von 4bf unter 6.5 kJ · mol-1 liegt. Die Konfigurationen und Konformationen der Addukte 4 und 5 werden diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130321
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  • 19
    Electronic Resource
    Electronic Resource
    Synthesis of photopolymerizable oligomers by coupling of 2-methacryloyloxyethyl acrylate via selective ene-reaction to oligobutadienes (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 15 (1994), S. 81-86 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1994.030150113
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  • 20
    Electronic Resource
    Electronic Resource
    Synthesis of thermoreversible polymers by aminolysis of poly(methyl 2-(N-acryloylamino)-2-methoxyacetate): Correlations of the lower critical solution temperatures (LCST) with the side group structures and the salt concentration in aqueous systems (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 15 (1994), S. 271-277 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1994.030150314
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