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  • Wiley-Blackwell  (85)
  • 1990-1994  (48)
  • 1970-1974  (37)
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  • 1
    Electronic Resource
    Electronic Resource
    Vinamidin-Chelate des Bors (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1301-1306 
    Details
    ISSN: 0009-2940
    Keywords: 1,3,2-Diazaborinies, dihydro- ; Protonation ; Calculations, AMI, 4-31G ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vinamidine Boron Chelate CompoundsThe chelate compound 7 is obtained by the reaction of the vinamidine 6 with Et2O - BF3. Protonation with HBF4 gives the cation 11. Comparison of the calculated and experimentally determined structures demonstrates 7 and 11 to be heterocyclic analogues of the cyclohexadienide 5 and 1,4-cy-cyclohexadiene (12).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230613
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  • 2
    Electronic Resource
    Electronic Resource
    Heterocyclen als Liganden, XI. Octamethyl-1,1′-diazaferrocen als bifunktionelle Stickstoff-Base (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 997-1002 
    Details
    ISSN: 0009-2940
    Keywords: 1,1′-Diazaferrocene ; octamethyl ; adducts ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocycles as Ligands, XI. - Octamethyl-1,1′-diazaferrocene as a Bifunctional Nitrogen Base(C4Me4N)2 Fe·2 HNC4Me4 (3) reacts with Brønstedt and Lewis acids to give the adducts [(C4Me4N·E)2Fe]n+ [4 - 6, 11 - 13; n=2, E=H, CH3, CH3C(O); n=O, E=BH3, BF3, Fe(CO)4]. The stepwise substitution of the tetramethylpyrrole molecules in 3 leads to the complexes [(C4Me4N·E)(C4Me4N·E')Fe]n+ [16, 17, 19; n - O, E=C4Me4NH, E'=Fe(CO)4; n=1, E=BH3, E'=H; n=2, E=H, E'=CH3]. Similarly, the complexes [{(C4Me4N)C(O)CH2CH2C(O)(NC4me4}Fe]Cl2 (9) and [Ag2{μMe4N)2Fe}2Fe}2](BF4)2·2 MeOH (15) are obtained. Reaction of [(C4Me4NH)2Fe](BF4)2 (4) with nBuLi gives the protonated diazaferrocene [(C4Me4NH)(C4Me4N)Fe]BF4 (18) from which the dimeric iron diamide {(C4Me4N)2Fe}2 (20) is obtained on further deprotonation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240505
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  • 3
    Electronic Resource
    Electronic Resource
    1,3,2-Diazaborinium-Verbindungen  -  neue Heteroaren-Kationen des Bors (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2197-2201 
    Details
    ISSN: 0009-2940
    Keywords: 1,3,2-Diazaborinium Compounds ; Calculations, AM1 ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,3,2-Diazaborinium Compounds  -  New Cationic Boron HeteroarenesThe diazaborinium cation 9 is obtained by the reaction of the vinamidine boron chelate 8 with Et2O - BF3. The cyclic aluminium compound 13 forms with the dichloroboranes RBCl2 (R = Cl, Et, Ph) the cations 15,16a, and 16b. AM1 calculations demonstrate the π interaction of the boron with the nitrogen atoms as well as with the fluoro substituent.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241009
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  • 4
    Electronic Resource
    Electronic Resource
    Free flow electrophoresis for the purification of proteins: I. Zone electrophoresis and isotachophoresis (1990)
    Weinheim : Wiley-Blackwell
    Electrophoresis 11 (1990), S. 304-309 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The principles and some applications of free flow zone electrophoresis and isotachophoresis are described. The influence of (i) carrier electrolyte conductivity on the migration velocity and (ii) band shape on zone electrophoresis was investigated. The technique was found convenient for studying the effect of pH on the mobility of proteins to create a mobility curve. The purification of alcohol dehydrogenase from a crude yeast extract revealed the separation power of zone electrophoresis for complex protein mixtures. Without additional steps, a purification factor of 5.4, with a recovery of 97 % alcohol dehydrogenase, was achieved. Free flow isotachophoresis was applied to the purification of immunoglobulins from human serum. Disadvantages of this technique are the time-consuming development of an optimized separation system and the empirical search for suitable spacers. Also, reaching of the steady state becomes increasingly difficult as the number of sample components increases.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150110406
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  • 5
    Electronic Resource
    Electronic Resource
    Free-flow electrophoresis for the purification of proteins: II. Isoelectric focusing and field step electrophoresis (1990)
    Weinheim : Wiley-Blackwell
    Electrophoresis 11 (1990), S. 942-947 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Two modes of continuous isoelectric focusing are described. The development of a natural pH gradient, consisting of a mixture of three buffer solutions, and the focusing behavior of human serum albumin is investigated. The advantages of isoelectric focusing in an artificial pH gradient of three buffer solutions are demonstrated on the purification of α-amylase from an E. coli protein extract. Furthermore the principle of field step electrophoresis is presented. The most important factors influencing the efficiency: (i) residence time, (ii) conductivity of the sample and (iii) sample zone width, are discussed. The use of a larger sized device to allow simultaneous multiple injections of the sample demonstrates the feasibility of scaling-up field step electrophoresis. This approach permits a throughput of about 20 mL sample solution per minute.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150111111
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  • 6
    Electronic Resource
    Electronic Resource
    Stereochemie und reaktives Verhalten tetrahalogenierter 2,3-Diazabicyclo[3.2.0]hept-2-ene und Bicyclo[2.1.0]pentane (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 759-770 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stereochemistry and Reactivity of Tetrahalogenated 2,3-Diazabicyclo[3.2.0]hept-2-enes and Bicyclo [2.1.0] pentanesThe addition of diazoalkanes to tetrahalogenated cyclobutenes 1-3 leads to 6,6,7,7-tetrahalo-2,3-diazabicyclo[3.2.0]hept-2-enes 4-8, the structure and stereochemistry of which are determined by means of n. m. r. spectroscopy. Thermal decomposition of 4, 5, and 8 in boiling toluene affords the tetrahalobicyclo[2.1.0]pentanes 9, 10, and 12 in good yields. Under the same conditions 7 decomposes in a stereospecific manner to form 11 and small amounts of 13. Sodium methoxide converts 9-11 into the cyclobutenes 14 and 15. Under the influence of sulfuric acid 10 forms the cyclobutenedione 16 or a mixture of cyclopentenones 18, 19 depending on the reaction conditions.
    Notes: Addition von Diazoalkanen an die tetrahalogenierten Cyclobutene 1-3, führt zu 6,6,7,7-Tetrahalogeno-2,3-diazabicyclo[3.2.0]hept-2-enen 4-8, deren Konstitution und Stereochemie auf NMR-spektroskopischem Weg ermittelt wurde. Durch thermische Zersetzung der Bicyclen 4,5 und 8 in siedendem Toluol erhält man in guten Ausbeuten Tetrahalogenobicyclo-[2.1.0]pentane 9,10 und 12. Unter gleichen Bedingungen entstehen aus 7 in stereospezifischer Reaktion 11 sowie geringe Mengen des Cyclobutens 13. Mittels Natriummethylat werden die Bicyclen 9-11 zu den Cyclobutenen 14, 15 abgebaut; unter dem Einfluß von konz. Schwefelsäure entsteht aus 10 je nach Reaktionsbedingungen das Cyclobutendion 16 bzw. ein Gemisch der Cyclopentenone 18 und 19.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070303
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese und Reaktivität von Silicium-Übergangsmetallkomplexen, V. Die modifizierte Alkalisalz-Eliminierungsmethode  -  ein genereller Weg zu Komplexen mit Silicium-Übergangsmetall-Struktureinheiten (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 979-995 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Reactivity of Silicon Transition Metal Complexes, V. The Modified Alkali Salt Elimination Method  -  a General Procedure for the Synthesis of Silicon Transition Metal CompoundsThe heterogeneous reaction of the sodium carbonylmetallates Na[Fe(CO)2π-C5H5], Na[M(CO)3π-C5H5] (M=Mo, W), and Na[Mn(CO)5] with various halo- and organohalosilanes leads to the formation of the corresponding silyl complexes. The new compounds are characterized by spectroscopy and the chemical properties are described. The results of a decomposition study of the trimethylsilyl-VIB transition metal complexes are discussed in connection with former synthetic experiments. Exchange reactions of these species with heterosiloxanes can be used for a qualitative estimation of relative metal-metalloid bond reactivity.
    Notes: Die Umsetzung der komplexen Metallate Na[Fe(CO)2π-C5H5], Na[M(CO)3π-C5H5] (M=Mo, W) und Na[Mn(CO)5] mit verschiedenen Halogen- und Organohalogensilanen führt in heterogener Reaktion zu den Silylkomplexen dieser Metalle. Die neuen Verbindungen werden spektroskopisch charakterisiert und ihre chemischen Eigenschaften beschrieben. Die Ergebnisse einer Zerfallsstudie der Trimethylsilyl-VIB-Übergangsmetallkomplexe werden im Zusammenhang mit früheren Syntheseversuchen diskutiert. Der Verlauf von Austauschreaktionen der gleichen Verbindungen mit Heterosiloxanen (Ge, Sn) ermöglicht eine qualitative Abschätzung der Reaktivität der Metall- Metalloideinheit.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070326
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  • 8
    Electronic Resource
    Electronic Resource
    Darstellung und dynamisches Verhalten von Mono- cyclopentadienylarsinen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 1228-1234 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Dynamic Behaviour of Mono-cyclopentadienylarsinesMono-cyclopentadienylarsines (3a-e) are synthesized by the reaction of cyclopentadienyl-trimethylsilane (1) or cyclopentadienyllithium (5) with the halogenoarsines 2a-e. They are very sensitive against air and moisture and thermally unstable. The cp-ligands are σ-bonded; the molecules have a fluxional structure. The rapidity of the degenerate metallotropic rearrangements is influenced by the other ligands on the arsenic atom.
    Notes: Mono-cyclopentadienylarsine (3a-e) werden durch Umsetzung von Cyclopentadienyl-trimethylsilan (1) oder Cyclopentadienyllithium (5) mit den Halogenarsinen 2a-e dargestellt. Sie sind äußerst luft- und feuchtigkeitsempfindlich und thermisch instabil. Es liegen σ-gebundene Cp-Liganden und Moleküle mit fluktuierender Struktur vor. Die Geschwindigkeit der entarteten metallotropen Umlagerungen wird durch die anderen Liganden am Arsenatom beeinflußt.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070419
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  • 9
    Electronic Resource
    Electronic Resource
    Photochemische und thermische Additionen von Acetylendicarbonsäure-dimethylester an Thiophen und 2,5-Dimethylthiophen1b) (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 674-696 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemical and Thermal Addition Reactions of Dimethyl Acetylenedicarboxylate with Thiophene and 2,5-Dimethylthiophene1b)Thermal diene synthesis of dimethyl acetylenedicarboxylate, diphenylacetylene, and 2-butyne with thiophene or 2,5-dimethylthiophene at temperatures between 165 and 330° leads to substituted benzene derivatives with concomitant sulfur elimination. At room temperature the sensitized and non-sensitized photo-addition of dimethyl acetylenedicarboxylate to thiophene or 2,5-dimethylthiophene yield also dimethyl phthalate and the 3,6-dimethyl-substituted dimethyl phthalate, respectively. The sensitized photoreaction proceeds via triplet-excited thiophenes and is mechanistically interpreted as occuring via biradical intermediates that either undergo ring-closure directly to the phthalate under simultaneous sulfur elimination or lead to instable 1,4-addition products with subsequent sulfur extrusion; in the latter case, the photo-addition would occur formally as a Diels-Alder reaction.
    Notes: Die thermische Diensynthese von Acetylendicarbonsäure-dimethylester, Diphenylacetylen und 2-Butin mit Thiophen oder 2,5-Dimethylthiophen führt zwischen 165 und 330° unter Eliminierung von Schwefel zu entsprechend substituierten Benzolderivaten. Sowohl die sensibilisierte als auch die unsensibilisierte Photoaddition von Acetylendicarbonsäure-dimethylester an Thiophen oder 2,5-Dimethylthiophen liefern bei Raumtemperatur ebenfalls Phthalsäure-dimethylester bzw. dessen 3,6-Dimethyl-Homologes. Die sensibilisierte Photoaddition verläuft über Triplett-angeregte Thiophene und wird mechanistisch interpretiert als eine über biradikalische Zwischenstufen entweder unmittelbar unter Schwefeleliminierung zum Phthalester oder- zunächst zum 1,4-Addukt führende formale Diels-Alder-Reaktion mit anschließender Schwefelabspaltung.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060233
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  • 10
    Electronic Resource
    Electronic Resource
    Elementorganische Amin/Imin-Verbindungen, XII. 1,3,2,4-Diazadiphosphetidin-diimide (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 552-557 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elementorganic Amine/Imine Compounds, XII. 1,3,2,4-Diazadiphosphetidine DiimidesThe elimination of trimethylchlorosilane from N-silylated aminochlorophosphine imides of type 2 affords the diazadiphosphetidine diimides 3, which form cis and trans isomers. 3a reacts with C6H5NCS to give the diazadiphosphetidine disulfide 5.
    Notes: N-Silylierte Aminochlorphosphin-imide des Typs 2 ergeben unter Trimethylchlorsilan-Abspaltung die Diazadiphosphetidin-diimide 3, die in Form von cis-und trans-Ringisomeren anfallen. 3a läßt sich mit Phenylsenföl in das Diazadiphosphetidin-disulfid 5 überführen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070221
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