Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1980-1984  (12)
  • 1965-1969
  • 1982  (12)
Source
Material
Years
  • 1980-1984  (12)
  • 1965-1969
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Basic cluster reactions. 1. Reversible unfolding of FeCo2Mo and FeCo2W clusters (1982)
    s.l. : American Chemical Society
    Organometallics 1 (1982), S. 756-757 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00065a017
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Basic cluster reactions. 2. Reversible carbon monoxide additions to iron (Fe4) clusters (1982)
    s.l. : American Chemical Society
    Organometallics 1 (1982), S. 874-875 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00066a022
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Hetero-Cluster: Metallaustausch über Organometall-dimethylarsenide (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2385-2408 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed Metal Clusters: Metal Exchange via Organometal DimethylarsenidesReactions of the methylidyne-tricobalt clusters YCCo3(CO)9 (1, Y = H, Me, Ph, p-Tol, F) with the organometal dimethylarsenides Cp(CO)3M—AsMe2 (2-4, M = Cr, Mo, W) initially yield the addition products 5-7 through CO replacement. From these by heating a Co—As fragment is eliminated, whereby the new mixed metal cluster YCCo2MCp(CO)8 (9-11) are formed. Of the MeCCo2Mo compound 10c the molecular structure was determined. The mixed metal clusters allow for CO substitution by which also their prochirality can be proved. Attempts to perform corresponding metal exchange reactions with other tetrahedral cobalt clusters (PhPCo3(CO)9, Co4(CO)12, HFeCO3(CO)12, CpNiCo3(CO)9) or with other organometal dimethylarsenides M—AsMe2 (M = Cp(CO)2Fe, (CO)5Mn, Me3P(CO)4Mn) were only partially successful.
    Notes: Die Umsetzung der Methylidin-tricobalt-Cluster YCCo3(CO)9 (1, Y = H, Me, Ph, p-Tol, F) mit den Organometall-dimethylarseniden Cp(CO)3M—AsMe2 (2-4, M = Cr, Mo, W) liefert zunächst durch CO-Austausch die Additionsprodukte 5-7. Aus diesen wird beim Erhitzen ein Co—As-Bruchstück eliminiert, wobei sich die neuen Hetero-Clusters YCCo2MCp(CO)8 (9-11) bilden. Von dem MeCCo2Mo-Vertreter 10c wurde die Molekülstruktur bestimmt. In den Hetero-Clustern ist CO-Substitution möglich, wodurch sich auch ihre Prochiralität nachweisen läßt. Versuche, entsprechende Metallaustauschreaktionen auch an anderen tetraedrischen Cobaltclustern (PhPCo3(CO)9, Co4(CO)12, HFeCo3(CO)12, CpNiCo3(CO)9) oder mit anderen Organometall-dimethylarseniden M—AsMe2 (M = Cp(CO)2Fe, (CO)5Mn, Me3P(CO)4Mn) durchzuführen, waren nur zum Teil erfolgreich.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150702
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Hetero-Cluster: Metallaustausch über zweikernige (Cyclopentadienyl)metallcarbonyle (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2409-2422 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed Metal Clusters: Metal Exchange via Dinuclear (Cyclopentadienyl)metal CarbonylsIn the tetrahedral cobalt cluster MeCCo3(CO)9 (2a) by means of the dinuclear (cyclopentadienyl)-metal carbonyls [CpM(CO)n+1]2 (1, M = Mo, W, Fe, Ni) one Co(CO)3 unit can be replaced by an isoelectronic unit CpM(CO)n. The best exchange reagent [CpNi(CO)]2 yields the corresponding mixed Co2Ni and Co3Ni clusters, resp. also with other YCCo3(CO)9 clusters (2, Y = Ph, p-Tol, F) and with Co4(CO)12. Thus, by combination of this method with the previously described organometal dimethylarsenide method from YCCo3(CO)9 (2, Y = Me, Ph) the clusters YCCoMoNiCp2(CO)5 (16) with three different metal atoms are obtained. Under modified reaction conditions twofold metal exchange in MeCCo3(CO)9 yields the cluster MeCCoMo2Cp2(CO)7 (15) and in PhCCo2MoCp(CO)8 yields the cluster PhCMoNi2Cp3(CO)2 (17). Of the CoMoNi compound 16a and the MoNi2 compound 17 the molecular structures were determined.
    Notes: In dem tetraedrischen Cobaltcluster MeCCo3(CO)9 (2a) läßt sich mit Hilfe der zweikernigen (Cyclopentadienyl)metallcarbonyle [CpM(CO)n+1]2 (1, M = Mo, W, Fe, Ni) eine Co(CO)3-Einheit durch eine isoelektronische Einheit CpM(CO)n ersetzen. Das beste Austausch-Reagens [CpNiCO]2 liefert auch mit anderen YCCo3(CO)9-Clustern (2, Y = Ph, p-Tol, F) und mit Co4(CO)12 die entsprechenden Co2Ni- bzw. Co3Ni-Heterocluster. Durch Kombination dieser Methode mit der vorstehend beschriebenen Organometall-dimethylarsenid-Methode lassen sich so aus YCCo3(CO)9 (2, Y = Me, Ph) die Cluster YCCoMoNiCp2(CO)5 (16) mit drei verschiedenen Metallatomen gewinnen. Unter veränderten Reaktionsbedingungen ergibt zweifacher Metallaustausch aus MeCCo3(CO)9 den Cluster MeCCoMo2Cp2(CO)7 (15) und aus PhCCo2MoCp(CO)8 den Cluster PhCMoNi2Cp3(CO)2 (17). Von der CoMoNi-Verbindung 16a und der MoNi2-Verbindung 17 wurden die Molekülstrukturen bestimmt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150703
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Chirale SFeCoM-Cluster: Enantiomerentrennung und Bestimmung der absoluten Konfiguration (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3243-3256 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chiral SFeCoM Clusters: Enantiomer Separation and Determination of the Absolute ConfigurationThe racemates of the clusters SFeCoMCp(CO)8 (1, M = Cr, Mo, W) were converted by the optically active ligand (—)-(R)-PMePrPh (2) to the pairs of diastereomers SFeCoMCp(CO)7—PMePrPh (3, M = Cr, Mo, W). These could be separated by fractional crystallization. Their reconversion to the pure optically active clusters 1 was achieved by scavenging of the phosphane ligand by methyl iodide under CO pressure. The clusters show rather high [α]-values. The absolute configuration of the molybdenum and tungsten compounds was determined by X-ray analysis and correlation of the ORD spectra. The enantiomers are relatively stable against thermal, but not against photochemical racemization.
    Notes: Die Racemate der Cluster SFeCoMCp(CO)8 (1, M = Cr, Mo, W) wurden mit dem optisch aktiven Liganden (—)-(R)-PMePrPh (2) in die Diastereomerenpaare SFeCoMCp(CO)7—PMePrPh (3, M = Cr, Mo, W) übergeführt. Diese ließen sich durch fraktionierende Kristallisation trennen. Ihre Rückumwandlung in die reinen optisch aktiven Cluster 1 gelang durch Abfangen des Phosphan-Liganden mit Methyliodid unter CO-Druck. Die Cluster zeigen z. T. sehr hohe [α]-Werte. Die absolute Konfiguration der Molybdän- und Wolframverbindungen wurde durch Röntgenstrukturanalyse und Korrelation der ORD-Spektren bestimmt. Die Enantiomeren sind recht stabil gegen thermische, nicht jedoch gegen photochemische Racemisierung.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821151004
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Chirale SFeCoM-Cluster: Darstellung, Nebenreaktionen und Nachweis der Chiralität (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3224-3242 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chiral SFeCoM Clusters: Synthesis, Side Reactions, and Proof of ChiralityFrom SFeCo2(CO)9 (1) via the intermediates SFeCo2(CO)8—AsMe2—MCp(CO)3 (3, M = Cr, Mo, W) by the Co—As elimination method the chiral clusters SFeCoMCp(CO)8 (8, M = Cr, Mo, W) could be obtained. From such reactions other clusters resulted too, of which one with a SCo2Mo(μ-AsMe2) framework (10b) and one with a SCo2W(μ-AsCoAs) framework (12) were identified by crystal structure analyses. The chirality of the intermediates 3 as well as that of PMe2Ph derivatives of the clusters 1, 8, and 10 could be proved NMR-spectroscopically by the diastereotopism of the AsMe2- and PMe2 methyl groups, respectively.
    Notes: Aus SFeCo2(CO)9 (1) ließen sich über die Zwischenstufen SFeCo2(CO)8—AsMe2—MCp(CO)3 (3, M = Cr, Mo, W) nach der Co—As-Eliminierungsmethode die chiralen Cluster SFeCoMCp(CO)8 (8, M = Cr, Mo, W) gewinnen. Bei solchen Reaktionen entstanden auch andere Cluster, von denen einer mit SCo2Mo(μ-AsMe2)-Gerüst (10b) und einer mit SCo2W(μ-AsCoAs)-Gerüst (12) durch Kristallstrukturanalyse identifiziert wurden. Sowohl in den Zwischenstufen 3 als auch in PMe2Ph-Derivaten der Cluster 1, 8 und 10 ließ sich die Chiralität NMR-spektroskopisch über die Diastereotopie der AsMe2-bzw. PMe2-Methylgruppen nachweisen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821151003
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Siebenfach koordinierte Carbonylkomplexe des Molybdäns und Wolframs, I. Die Komplexe WHal2(CO)4L (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3555-3564 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbonyl Complexes of Molybdenum and Tungsten of Coordination Number Seven, I. The Complexes WHal2(CO)4LBy oxidative addition of the halogens bromine and iodine to the complexes W(CO)5L the compounds WI2(CO)4L (2, L = PMe3, AsMe3, SbMe3) and WBr2(CO)4L (3, L = PMe3, AsMe3) are isolated and the compounds WI2(CO)4L (2, L = PBu3, NMe3, NEt3, SMe2) can be spectroscopically identified. The bromo complexes are reversibly converted by CO elimination to the complexes [WBr2(CO)3L]2 (4, L = PMe3, AsMe3). With chlorine only the dimers [WCl2(CO)3L]2 (6, L = PMe3, AsMe3) can be isolated. Mixtures of WI2(CO)4L and WBr2(CO)4L undergo halogen exchange. The coordination geometry of WI2(CO)4PMe3 (2a) in the crystal is that of a capped octahedron with a CO ligand in the capping position and facial arrangement of the iodine and PR3 ligands.
    Notes: Durch oxidative Addition der Halogene Brom und Iod an die Komplexe W(CO)5L sind die Verbindungen WI2(CO)4L (2, L = PMe3, AsMe3, SbMe3) und WBr2(CO)4L (3, L = PMe3, AsMe3) isolierbar und die Verbindungen WI2(CO)4L (2, L = PBu3, NMe3, NEt3, SMe2) spektroskopisch nachweisbar. Die Bromkomplexe wandeln sich durch CO-Abspaltung reversibel in die Komplexe [WBr2(CO)3L]2 (4, L = PMe3, AsMe3) um. Mit Chlor lassen sich nur die Dimeren [WCl2(CO)3L]2 (6, L = PMe3, AsMe3) isolieren. Gemische von WI2(CO)4L und WBr2(CO)4L unterliegen einem Halogenaustausch. Die Koordinationsgeometrie von WI2(CO)4PMe3 (2a) im Kristall ist die eines überkappten Oktaeders mit einem CO-Liganden in der Kappenposition und facialer Anordnung der Iod- und PR3-Liganden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821151108
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Siebenfach koordinierte Carbonylkomplexe des Molybdäns und Wolframs, II. Die Komplexe MHal2(CO)3L2 und MHal2(CO)2L3 (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3565-3579 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbonyl Complexes of Molybdenum and Tungsten of Coordination Number Seven, II. The Complexes MHal2(CO)3L2 and MHal2(CO)2L3The complexes WHal2(CO)4L (3 - 5, Hal = I, Br, Cl; L = PMe3, AsMe3, SbMe3) readily undergo CO substitution. Thereby the complexes WHal2(CO)3LL′ (7 - 13, 24, L′ = PMe3, AsMe3, SbMe3, AsMe2H, P(OMe)3, PPh3, Py, I) can be prepared. Compounds of this type are also accessible from [WHal2(CO)4]2 with PMe3, AsMe3, or SbMe3 as well as from Mo(CO)6 and W(CO)6 resp., with AsMe3Hal2. Subsequent reactions of such interconversions are the elimination of CO and further substitution yielding the complexes MHal2(CO)2(PMe3)3 (25, 26, M = Mo, W; Hal = I, Br, Cl).
    Notes: Die Komplexe WHal2(CO)4L (3 - 5, Hal = I, Br, Cl; L = PMe3, AsMe3, SbMe3) unterliegen sehr leicht einer CO-Substitution. Dadurch lassen sich aus ihnen die Komplexe WHal2(CO)3LL′ (7 - 13, 24, L′ = PMe3, AsMe3, SbMe3, AsMe2H, P(OMe)3, PPh3, Py, I) darstellen. Verbindungen dieses Typs sind auch aus [WHal2(CO)4]2 mit PMe3, AsMe3 und SbMe3 sowie aus Mo(CO)6 bzw. W(CO)6 mit AsMe3Hal2 zugänglich. Folgereaktionen solcher Umsetzungen sind die Abspaltung von CO sowie weitere Substitution zu den Komplexen MHal2(CO)2(PMe3)3 (25, 26, M = Mo, W; Hal = I, Br, Cl).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821151109
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Siebenfach koordinierte Carbonylkomplexe des Molybdäns und Wolframs, III. Isonitril- und Acetylenkomplexe des Wolframs (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3580-3586 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbonyl Complexes of Molybdenum and Tungsten of Coordination Number Seven, III. Isonitrile and Acetylene Complexes of TungstenIn the complex WI2(CO)4(CNR) (1c, R = tert-C4H9) formed from W(CO)5(CNR) and iodine, all CO ligands can be replaced stepwise by CNR whereby finally [WI(CNR)6]I (6) results. With acetylene and phenylacetylene the complexes WI2(CO)4L (1, L = PMe3, AsMe3, CN-tert-C4H9) react to form cis- and trans-WI2(CO)2L(HC ≡ CR) (7 - 9) together with oligomers of the acetylenes.
    Notes: In dem aus W(CO)5(CNR) und Iod gebildeten Komplex WI2(CO)4(CNR) (1c, R = tert-C4H9) lassen sich schrittweise alle CO-Liganden durch CNR verdrängen, wobei schließlich [WI(CNR)6]I (6) resultiert. Mit Acetylen und Phenylacetylen reagieren die Komplexe WI2(CO)4L (1, L = PMe3, AsMe3, CN-tert-C4H9) zu cis- und trans-WI2(CO)2L(HC ≡ CR) (7 - 9), wobei auch Oligomere der Acetylene entstehen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821151110
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Photoinitiierte Hydrosilylierung in Gegenwart tetraedrischer Heterometallcluster: Katalyse durch intakte ClusterMetallcluster-Katalyse, 5. Mitteilung. Diese Arbeit wurde von der National Science Foundation (Grant CHE-77-06810) unterstützt.  -  4. Mitteilung: [1b]. (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 94 (1982), S. 805-806 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19820941037
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...