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  • 1
    Electronic Resource
    Electronic Resource
    Direkter Metallaustausch an Phosphiniden-verbrückten FeCo2-Clustern (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 2765-2774 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Direct Metal Exchange in Phosphinidene-Bridged FeCo2 ClustersThe reactions of the clusters RPFeCo2(CO)9 (1a, R = Me; 1b, R = t-Bu) with [CpNiCO]2 (2) yielded product mixtures which originate from metal exchange reactions as well as from cluster rearrangement and ligand exchange. The crystal structures of the resulting clusters (μ4-MeP)2-Fe2CoNiCp(CO)8 (4) and (μ3-t-BuP)FeCoNiCp(CO)6 (5) were determined.
    Notes: Die Umsetzung der Cluster RPFeCo2(CO)9 (1a, R = Me; 1b, R = t-Bu) mit [CpNiCO]2 (2) führte zu Produktgemischen, die sowohl aus Metallaustauschreaktionen als auch aus Cluster-Umlagerung und Ligandenübertragung resultieren. Von den dabei entstehende Clustern (μ4-MeP)2-Fe2CoNiCp(CO)8 (4) und (μ3-t-BuP)FeCoNiCp(CO)6 (5) wurden Kristallstrukturanalysen durchgeführt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160805
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  • 2
    Electronic Resource
    Electronic Resource
    Chirale PFeCoM-Cluster: Darstellung durch Metallaustausch und Untersuchung der optischen Aktivität (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 2748-2764 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chid PFeCoM Clusters: Preparation by Metal Exchange and Investigation of the Optical ActivityThe clusters RPFeCo2(CO)9 (1, R = Me, t-Bu, Ph) react with the organometal dimethylarsenides Cp(CO)3M—AsMe2 (3, M = Mo, W) to form the substitution derivatives RPFeCo2(CO)8-AsMe2-M(CO)3Cp (4, M = Mo; 5, M = W) and the hetero clusters RPFeCoMCp(CO)8 (6, M = Mo; 7, M = W). With R = tert-butyl the tetranuclear clusters t-BuPFeCo2M(AsMe2)Cp(CO)8 (8, M = Mo, W) are isolated as reaction intermediates. From t-BuPCo3(CO)9 (2) and Cp(CO)3Mo-AsMe2 the cluster t-BuPCo2Mo(AsMe2)Cp(CO)6 (9) is formed. The structures of the molybdenum containing clusters 6a and 9 were determined. The compound MePFeCoWCp(CO)8 (7a) is separated into its enantiomers via substitution with the phosphane ligand (-)-menthyl-O—PPh2. The ORD data of these show little resemblance with those of the corresponding sulfurbridged clusters.
    Notes: Die Cluster RPFeCo2(CO)9 (1, R = Me, t-Bu, Ph) setzen sich mit den Organometall-dimethyl-arseniden Cp(CO)3M—AsMe2(3, M = Mo, W) zu den Substitutions-Derivaten RPFeCo2(CO)8-AsMe2 - M(CO)3Cp (4, M = Mo; 4, M = Mo; 5, M = W) und zu den Hetero-Clustern RPFeCoMCp(CO)8 (6, M = Mo; 7, M = W) um. Für R = tert-Butyl können dabei als Zwischenstufen die Vierkerncluster t-BuPFeCo2M(AsMe2)Cp(CO)8(8, M = Mo, W) isoliert werden. Aus t-BuPCo3(CO)9(2) entsteht mit Cp(CO)3Mo-AsMe2 der Cluster t-BuPCo2Mo(AsMe2)Cp(CO)6 (9). Von den molybdänhaltigen Clustern 6a und 9 wurden die Strukturen bestimmt. Die Verbindung MePFeCoWCp(CO)8 (7a) läßt sich mit dem Phosphanliganden (-)-Menthyl-O—PPh2 in die Enantiomeren zerlegen. Deren ORD-Daten zeigen wenig Verwandtschaft mit denen der entsprechenden schwefelverbrückten Cluster.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160804
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  • 3
    Electronic Resource
    Electronic Resource
    Cluster-Konstruktion: Schrittweiser Aufbau von μ3-RP-Trimetall-Clustern über P-Hal-Verbindungen (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 2322-2336 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cluster Construction: Stepwise Formation of μ3PR Trimetal Clusters via P-Hal CompoundsStarting from MePCl2 the iron complexes (CO)4Fe - PMe(NMe2)2) (1), (CO)4Fe - PMe-(NMe2)Cl (2), (CO)4Fe - PMe(NMe2)H (3) and (CO)4Fe - PMe(H)Cl (4) are accessible. Of these the PCl compounds 2 and 4 with carbonyl metalates yield the metal-metal bonded functional dinuclear complexes (μ-PMeNMe2)FeCo(CO)7 (5), (μ-PMeH)FeCo(CO)7 (6a), (μ-PMeH)FeMn(CO)8 (7) and (μ-PMeH)Fe2(CO)6NO (8).In the dinuclear complexes (μ-PRH)FeCo(CO)7 (6, R=;Me, tBu) CCl4 CBr4 effect H/Hal exchange with formation of (μ-PRHal)FeCo(CO)7 (9, Hal=;Cl; 10, Hal=;Br). Subsequent reaction with carbonyl metalates leads to the trinuclear complexes FeCo(CO)7-(μ-RP)-M′ (11, M′=;Mn(CO)5; 12, M′=;FeCp(CO)2)) and/or to the mixed metal clusters (μ-RP)FeCo(CO)6(13, M=;Mn(CO)4; 14, M=;FeCp(CO); 15, M =CrCp(CO)2; 16, M=;WCp(CO)2). Crystal structure determinations were undertaken for the clusters 13b and 14b.
    Notes: Ausgehend von MePCl2 sind die Eisenkomplexe (CO)4Fe - PMe(NMe2)2) (1), (CO)4Fe - PMe-(NMe2)Cl (2), (CO)4Fe - PMe(NMe2)H (3) und (CO)4Fe - PMe(H)Cl (4) zugänglich. Von diesen liefern die PCl-Verbindungen 2 und 4 mit Carbonylmetallaten die Metall-Metall-verknüpften funktionellen Zweikernkomplexe (μ-PMeNMe2)FeCo(CO)7 (5), (μ-PMeH)FeCo(CO)7 (6a), (μ-PMeH)FeMn(CO)8 (7) und (μ-PMeH)Fe2(CO)6NO (8). In den Zweikernkomplexen (μ-PRH)FeCo(CO)7 (6, R=;Me. tBu) tritt mit CCl4 oder CBr4 H/Hal-Austausch zu (μ-PRHal)FeCo(CO)7 (9, Hal=;Cl; 10, Hal=;Br) ein. Anschließende Umsetzung mit Carbonylmetallaten liefert die Dreikernkomplexe FeCo(CO)7-(μ-RP)-M′ (11, M′=;Mn(CO)5; 12, M′=;FeCp(CO)2)) und/oder die Hetero-Cluster (μ-RP)FeCo(CO)6(13, M=;Mn(CO)4; 14, M=;FeCp(CO); 15, M =CrCp(CO)2; 16, M=;WCp(CO)2). Von den Cluster 13b und 14b wurden Kristallstrukturbestimmungen durchgeführt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160621
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  • 4
    Electronic Resource
    Electronic Resource
    Cluster-Konstruktion: Schrittweiser Aufbau von μ3-RP-Trimetall-Clustern über P-H-Verbindungen (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 2311-2321 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cluster Construction: Stepwise Formation of μ3-RP Trimetal Clusters via P-H CompoundsThe easily accessible complexes RPH2 · Fe(CO)4 (1, R=;Me, tBu, Ph) contain two functional P - H units which can be reacted successively with metal carbonyls. With Co2(CO)8 or (η-C3H5)Co(CO)3 they yield intermediately the dinuclear complexes (μ-RPH)Fe(Co(CO)7 (2). These react with cobalt carbonyls to give (μ3-RP)FeCo2(CO)9 (3, R=;Me, tBu, Ph), with Fe3(CO)12 to give (μ-MeP)Fe2Co(CO)9H (7a) and with Ru3(CO)12 to form (μ-MeP)FeRuCo(CO)9H 8. Byproducts of these reactions are inter alia the complex (μ-tBuPH)2FeCo2(CO)8 (5) and the new hydrido clusters (μ3-tBuP)Fe2Co(CO)9H (7b) and (μ3-MeP)Ru2Co(CO)9H (9). The way to 8 represents the first successful stepwise synthesis of a chiral tetrahedrane framework. Also chiral are the substitution products (μ3RP)FeCo2(CO)8PMe2Ph (10, R=;Me, tBu, ph), which are produced together with the disubstituted meso compounds(μ3-RP)FeCo2(CO)7(PMe2Ph)2 (11, R=;Me, tBu, Ph).
    Notes: Die leicht zugänglichen Komplexe RPH2 · Fe(CO)4 (1, R=;Me, tBu, Ph) besitzen zwei funktionelle P - H-Einheiten, die nacheinander mit Metallcarbonylen zur Reaktion gebracht werden können. Mit Co2(CO)8 bzw. (nC3H5)Co(CO)3 liefern sie intermediär die Zweikernkomplexe (μ-RPH)Fe(Co(CO)7 (2). Diese reagieren mit Cobaltcarbonylverbindungen zu (μ3-RP)FeCo2(CO)9 (3, R=;Me, tBu, Ph), mit Fe3(CO)12 zu (μ-MeP)Fe2Co(CO)9H (7a) und mit Ru3 (CO)12 zu (μ3-MeP)FeRuCo(CO)9H (8. Als Nebenprodukte bei diesen Reaktionen fallen u. a. der Komplex (μ-tBuPH)2FeCo2(CO)8 (5) und die neuen Hydrido-Cluster (μ3-tBuP)Fe2Co(CO)2Co(CO)9H (7b) und (μ3-MeP)Ru2Co(CO)9H (9) an. In 8 ist erstmalig der schrittweise Aufbau eines chiralen Tetrahedrangerüsts gelungen. Chiral sind auch die Substitutionsprodukte (μ3RP)FeCo2(CO)8PMe2Ph (10, R=;Me, tBu, ph), die zusammen mit den disubstituierten meso-Verbindungen (μ3-RP)-Fe Co2(CO)7(PMe2Ph)2 (11, R=;Me, tBu, Ph) entstehen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160620
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  • 5
    Electronic Resource
    Electronic Resource
    Elementare Cluster-Reaktionen: Öffnung und Zerlegung von Vierkernclustern durch CO (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2438-2451 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Basic Cluster Reactions: Opening and Partial Fragmentation of Tetranuclear Clusters by COThe influence of CO on 16 mixed tetranuclear clusters of the general type M4(μ3-E(μ2-AsMe2) with M = Co, Fe, Ru, Mo, W, and E = S, PR, CR is reported. In all cases fragmentation with formation of trinuclear clusters occurs at slightly elevated pressures, during which a Co - As unit is normally eliminated. At normal pressure intermediates are observed in 7 cases, 4 of which can be isolated. Crystal structure analysis of the intermediate FeCo2MoSAsMe2Cp(CO)10 (8a) has shown that two metal-metal bonds are opened upon addition of CO with formation of the new EM3(μ-AsM) cluster framework. Under vacuum the intermediates are reconverted to the starting clusters with elimination of CO.
    Notes: Bei der Einwirkung von CO auf 16 Hetero-Vierkerncluster des allgemeinen Typs M4(μ3-E)(μ2-AsMe2) mit M = Co, Fe, Ru, Mo, W und E = S, PR, CR tritt in allen Fällen unter geringem Überdruck Abbau zu Dreikernclustern ein, wobei in der Regel eine Co - As-Einheit abgespalten wird. Bei Normaldruck werden in 7 Fällen Zwischenstufen beobachtet, die in 4 Fällen auch isolierbar sind. Durch Kristallstrukturanalyse der Zwischenstufe FeCo2MoSAsMe2Cpt(CO)10 (8a) wird belegt, daß durch Addition von CO zwei Metall-Metall-Bindungen geöffnet werden, wodurch das neuartige EM3(μ-AsM)-Clustergerüst entsteht. Im Vakuum wandeln sich die Zwischenstufen unter Abspaltung von CO wieder in die Ausgangscluster zurück.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170715
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  • 6
    Electronic Resource
    Electronic Resource
    3-Azabicyclische Ketone durch Reaktionen von 1,3-Diethoxy-2-azapropenylium-Salzen mit Enaminen cyclischer Ketone (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 133-141 
    Details
    ISSN: 0009-2940
    Keywords: 2-Azapropenylium salts ; Enamines ; 3-Azabicyclo[3.2.1]oct-2-en-8-ones ; 3-Azabicyclo[3.3.1]non-2-en-9-ones ; Stereochemistry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-Azabicyclic Ketones from 1,3-Dialkoxy-2-azapropenylium Salts and Enamines of Cyclic Ketones1,3-Diethoxy-2-azapropenylium salts 1 are powerful biselectrophiles and react diastereoselectively with enamines of five-membered ring ketones 2 to yield novel 3-azabicyclo[3.2.1]oct-2-en-8-one 5 after hydrolysis of the intermediate iminium salts 3, 4. Some of the iminium salts 3 can be hydrolyzed further to provide the diketo imines 6. With enamines of six-membered ring ketones 7 the 3-azabicyclo[3.3.1]non-2-en-9-ones 10, 11 are obtained after hydrolytic workup. Mixtures of diastereomers 10/11 are found in the case of 7a, b, whereas with 7g  -  j the endo-phenyl derivatives 10 are formed exclusively. With the unsymmetrical enamine 7b only one regioisomer is observed. The decalone enamine 12 reacts with 1a to yield the tricyclic iminium salt 13.  -  The configuration of the bicyclic products has been determined by using NMR spectroscopic techniques (COSY, polarisation transfer by long range couplings); an X-;Ray analysis of compound 10a is used as basis for the NMR assignments. General rules for the determination of the stereochemistry of these azabicyclic systems by 1H-NMR shift arguments are derived.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260121
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  • 7
    Electronic Resource
    Electronic Resource
    Cluster-Konstruktion: Synthese von Vierkernclustern durch Aggregation (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 3774-3793 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cluster Construction: Synthesis of Tetranuclear Clusters via AggregationTrinuclear clusters with EM3 frameworks (1-3, EM3 = SFeCo2, SRuCo2, PFeCo2, CCo3) can be connected via CO substitution with AsM′ units (M′ = Cr, Mo, W). The EM3-AsM′ intermediates 7-10 eliminate CO under appropriate conditions to form clusters 13-16 with tetrahedral M3M′ frameworks which bear ų3-E and ų2-AsMe2 ligands. The combinations M3M′ = FeCo2Mo, FeCo2W, RuCo2Mo, RuCo2W, Co3Mo, and Co3W were realized. Starting from trinuclear clusters 4, 5 with the chiral frameworks EM3 = SFeCoMo, SFeCoW, SRuCoMo, and SRuCoW by the same procedure via 11, 12 tetranuclear clusters 17, 18 with the frameworks M3M′ = FeCoMo2, FeCoW2, FeCoMoW, RuCoMo2, RuCoW2, and RuCoMoW are obtained. Among these are the first two clusters with four different metal atoms. The crystal structures of FeCo2MoS(AsMe2)Cp(CO)8 (13a), RuCo2MoS(AsMe2)Cp(CO)8 (14a), and FeCoMoWS-(AsMe2)Cp2(CO)7 (17b) were determined. The tetranuclear clusters show ligand fluxionality as shown by dynamic 1H NMR spectroscopy.
    Notes: An Dreikerncluster mit EM3-Gerüst (1-3, EM3 = SFeCo2, SRuCo2, PFeCo2, CCo3) lassen sich durch CO-Substitution AsM′-Einheiten (M′ = Cr, Mo, W) anbinden. Die EM3-AsM′-Zwischenstufen 7-10 spalten unter geeigneten Bedingungen CO ab, wobei Cluster 13-16 mit tetraedrischem M3M′-Gerüst entstehen, welches ų3-E- und ų-AsMe2-Liganden trägt. Es wurden die Kombinationen M3M′ = FeCo2Mo, FeCo2W, RuCo2Mo, RuCo2W, Co3Mo und Co3W verwirklicht. Ausgehend von Dreikernclustern 4, 5 mit den chiralen Gerüsten EM3 = SFeCoMo, SFeCoW, SRuCoMo und SRuCoW entstehen auf die gleiche Weise über 11, 12 Vierkerncluster 17, 18 mit den Gerüsten M3M′ = FeCoMo2, FeCoW2, FeCoMoW, RuCoMo2, RuCoW2, und RuCoMoW. Unter diesen sind die beiden ersten Cluster mit vier verschiedenen Metallatomen. Von FeCo2MoS(AsMe2)Cp(CO)8 (13a), RuCo2MoS(AsMe2)Cp(CO)8 (14a) und FeCoMoWS-(AsMe2)Cp2(CO)7 (17b) wurden die Kristallstrukturen bestimmt. Die Vierkerncluster zeigen eine Ligandenfluktuation, die durch dynamische 1H-NMR-Spektroskopie zu erfassen ist.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831161203
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  • 8
    Electronic Resource
    Electronic Resource
    Azo-dyes as labels and as photoisomerizable units in chiral polyisocyanates (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 101-116 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polyisocyanates (nylon 1) with azochromophores in the side chains were prepared for the first time. For this purpose we have synthesized two new azo dyes containing isocyanato groups. The monomers were copolymerized with alkyl isocyanates to prepare chiral dye-containing polyisocyanates. Optical rotatory dispersion and circular dichroism measurements support the helical polymer structure with predominantly one twist sense (due to the chiral side chains, P and M helices are diastereomeric). The completely reversible photochemical isomerization (trans to cis) of the azochromophores reaches high conversions (about 80%), but does not change the conformation of the main chain.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940108
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  • 9
    Electronic Resource
    Electronic Resource
    Studien über Chloro-bismutiate (1923)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 128 (1923), S. 137-152 
    Details
    ISSN: 0863-1786
    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/zaac.19231280114
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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Instabilität isothermer heterogener FestbettreaktorenÜberarbeitete Fassung eines von A. Renken gehaltenen Vortrages auf der Sitzung des DECHEMA-Arbeitsausschusses „Technische Reaktionen“ am 28. 2. 1975 in Arnoldshain/Ts. (1975)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 47 (1975), S. 1029-1029 
    Details
    ISSN: 0009-286X
    Keywords: Festbettreaktor ; kinetische Instabilität ; Äthylen-Hydrierung ; Reaktionskinetik ; Rückvermischung ; Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330472413
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