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  • Wiley-Blackwell  (9)
  • 1975-1979  (9)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 1074-1086 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of Normal π-Cycloolefin Rhodium ComplexesBy reactions of [LRhCl]2, (L = 1,5-cycloheptadiene, 1,3-cycloheptadiene, norbornadiene) and of [C5(CH3)5RhCl2]2 with i-C3H7MgBr in the presence of cyclic oligoolefins with different ring size neutral π-complexes of the type [(diene)RhI(allyl)] und [(diene)RhI(dienyl)] were synthesized in which the central metal achieves a 16- and 18-electron valence shell, respectively. The spectroscopic and several chemical properties of the compounds are described. In contrast to the 16-electron complexes some of the 18-electron compounds show a fluxional behaviour.
    Notes: Durch Umsetzung von [LRhCl]2(L = 1,5-Cyclooctadien, 1,3,-Cycloheptadien, Norbornadien) und von[C5 (CH3) 5RhCl2]2miti-C3H7MgBr in Gegenwart cyclischer Oligoolefine unterschiedlicher Ringgröße wurden neutrale π-Komplexe des Typs [(Dien)RhI(Allyl)] und [(Dien)RhI(Dienyl)] synthetisiert, in denen das Zentralmetall eine 16- bzw. 18-Elektronen-Valenzschale erreicht. Die spektroskopischen und einige chemischen Eigenschaften der Verbindungen werden beschrieben. Im Gegensatz zu den 16-Elektronen-Komplexen zeigen einige 18-Elektronen-Verbindungen ein fluktuierendes Verhalten.
    Additional Material: 2 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 273-282 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Synthesis of Neutral πOlefin Ruthenin Complex by Use of the Isopropyl Griganard Method[LRuCl2]n (L= benzene, 1,3-cycloheptadiene, or 1,3,5-cycloheptatriene) react with i-C3H7MgBr in the presence of cyclic oligoolefins to give the new compounds (benzene)(1,5-cyclooctadiene)ruthenium(0) (2), bis(cycloheptadienyl)ruthenium(II) (7), and (1-5-η-cyclo-heptadienyl)(1-5-η-cycloheptatrienyl)ruthenium(II) (8) besides a series of known π-sandwich complexes. 13C n.m.r. spectra of 7 at different temperatures prove a fluxional structure of the cycloheptadienyl ligands.
    Notes: Durch Umsetzung von [LRuCl2]n (L = Benzol, 1,3-Cycloheptadien oder 1,3,5-Cyclohepta-trien) mit i-C3H7MgBr in Gegenwart cyclischer Oligoolefine wurden neben einer Reihe bekannter π-Sandwich-Komplexe die neuen Verbindungen (Benzol)(1,5-cyclooctadien)-ruthenium(0) (2), Bis(cycloheptadienyl)ruthenium(II) (7) und (1-5-η-Cycloheptadienyl)-(1-5-η-cycloheptatrienyl)ruthenium(II) (8) synthetisiert. 13C-NMR-Spektren von 7 bei verschiedenen Temperaturen beweisen eine fluktuierende Struktur der Cycloheptadienyl-Liganden.
    Additional Material: 1 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1222-1229 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chromium π-Sandwich Complexes with Eight-Membered Cyclic OlefinsCrCl3 reacts with i-C3H7MgBr in the presence of a mixture of 1,3-cyclooctadiene and 1,3,5-cyclooctatriene to give bis(cyclooctadienyl)chromium (II) (1) and (cyclooctadienyl)(1,3,5-cyclooctatriene)chromium(I) (2). 1 can be converted into (1,3,5-cyclooctatriene)(3a-6a-η-2,3-dihydro-1 H-pentalenyl)chromium(I) (3) by dehydrogenation. The compounds 1-3 are paramagnetic The system CrCl3/i-C3H7MgBr/cyclooctatetraene yields diamagnetic tris(cyclooctatetraene)-dichromium(0)4. The properties as well as the mass and 1H n. m. r. spectra of the π complexes are described.
    Notes: Bei der Umsetzung von CrCl3 mit i-C3H7MgBr in Gegenwart eines Gemisches von 1,3-Cyclooctadien und 1,3,5-Cyclooctatrien entstehen nebeneinander Bis(Cyclooctadienyl)chrom(II) (1) und (Cyclooctadienyl)(1,3.5-Cyclooctatrien) chrom (I) (2). 1 läßt sich durch Dehydrierung in (1,3,5-Cyclooctatrien)(3a-6a-η-2,3-dihydro-1H-pentalenyl)chrom(I) (3) überführen. Die Verbindungen 1-3 sind paramagnetisch. Das System CrCl3/i-C3H7MgBr/Cyclooctatetraen liefert diamagnetisches Tris(cyclooctatetraen)dichrom(0) 4. Die Eigenschaften sowie die Massen- und 1H-NMR-Spektren der π-Komplexe werden beschrieben.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1211-1221 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: π-Cyclooctatrienyl and π-Cyclootatetraene Rhodium ComplexesReaction of [(diene)RhCl]2 with Na2C8H8 in THF and successive hydrolysis leads to the formation of the complexes [(diene)Rh(cyclooctatrienyl)] (7: diene = 1,5-cyclooctadiene; 8: diene = norbornadiene). It follows from 1H-and 13C n. m. r. investigations that in these fluxional molecules the Rh-atom at 20° C achieves and 18-, at low temperatures a 16-electron configuration. 7 is protonated by HPF6 in ether. Depending on the reaction conditions 7 and 8 in solution at 20° C are converted into different dinuclear complexes with Rh—Rh bonds; from 7 either (1,5-cyclooctadiene)-μ-(3-5-η: 1-2: 6-7-η-cyclooctatrienyl)(3-5-η-cyclooctatrienyl)dirhodium (9), confirmed by X-ray structure analysis, or bis(1,5-cylcooctadiene)-μ-(cyclooctatetraene)dirhodium (10) is formed, 8 yields bis(norbornadiene)-μ-(cyclooctatertraene)dirhodium (11) as well as not isolated Rh2C23H26 which apparently has a structure analogous to that of 9.
    Notes: Umsetzungen von [(Dien) RhCl]2 mit Na2C8H8 in THF führen nach anschließender Hydrolyse zu den Komplexen [(Dien)Rh(Cyclooctatrienyl)] (7: Dien = 1, 5-Cyclooctadien; 8: Dien = Norbornadien). Nach 1H-und 13C-NMR-Untersuchungen liegt in diesen fluktuierenden Molekülen bie 20° C eine 18-, bei tiefer Temperatur eine 16-Elektronenkonfiguration am Rh-Atom vor. 7 läßt sich mit HPF6 in Äther protonieren. In Lösung wandeln sich 7 und 8 bei 20° C je nach Reaktionsbedingungen in unterschiedliche zweikernige Komplexe mit Rh-Rh-Bindungen um; aus 7 entsteht entweder röntgenstrukturanalytisch gesichertes (1,5-Cyclooctadien)-μ-(3-5-η: 1-2 : 6-7-η-cyclooctatrienyl)(3-5-η-cyclooctatrienyl)dirhodium (9) oder Bis(1,5-cyclooctadien)-μ-(cyclooctatetraen)dirhodium (10), 8 bildet Bis(norbornadien)-μ-(cyclooctatetraen)dirhodium (11) sowie nicht isoliertes Rh2 C23 H26 mit offensichtlich zu 9 analoger Struktur.
    Additional Material: 4 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 781-782 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1359-1364 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neutral (η-Allyl)(η-l,5-cyclooctadiene)rhodium (I) Complexes[(COD)RhCl]2 (COD = 1,5-cyclooctadiene) (1) reacts with i-C3H7 MgBr in the presence of acyclic conjugated dienes to give neutral, diamagnetic π-complexes of the type [(COD)Rh1(allyl)] (2-7) in which the central metal achieves a 16-electron valence shell. The complex formation is regio- and stereoselective, only one isomer being produced in any case.
    Notes: Durch Umsetzung von [(COD)RhCl]2 (COD = 1,5-Cyclooctadien) (1) mit i-C3H7MgBr in Gegenwart acyclischer konjugierter Diene werden neutrale, diamagnetische π-Komplexe der allgemeinen Form [(COD)Rh1(Allyl)] (2-7) hergestellt, in denen das Zentralmetall eine 16-Elektronen-Valenzschale erreicht. Die Komplexbildung erfolgt regio- und stereoselektiv, in jedem Falle entsteht nur ein Isomeres.
    Additional Material: 1 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 760-761 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 8
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 9
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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