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  • Inorganic Chemistry  (732)
  • SPACE SCIENCES
  • 1990-1994  (732)
  • 1945-1949
  • 1992  (732)
  • 1
    Electronic Resource
    Electronic Resource
    Masthead (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992) 
    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.19921250101
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesen neuer bororganischer Ringe mit zwei Bor-Atomen durch Borylierung des Trimethylenmethan-Dianions (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 23-29 
    Details
    ISSN: 0009-2940
    Keywords: Diboracycloalkanes ; Diboracycloalkenes ; Trimethylenemethane, borylation of the dianion of ; Allylboranes, B - C bond length ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses of New Organoboron Rings with two Boron Atoms by Borylation of the Trimethylenemethane DianionBorylation of Li2[C(CH2)3] (1) provides a versatile starting point for the synthesis of 5-, 6-, 7-, and 8-membered ring systems with two boron atoms and leads to 1,5-bis(dialkylamino)-3,7-dimethylene-1,5-diboracyclooctanes 2a, b (a: R=Et; b: R=iPr), 1,3-bis(dialkylamino)-5-methylene-1,3-diboracyclohexanes 8a, b, 1,3-bis(diethylamino)-5-methyl-1,3-dibora-4-cyclo-hexene (10), and 1,4-bis(dialkylamino)-6-methylene-1,4-dibora-2-cycloheptenes 11a, b. The compounds 2b, 8b, and the 2,3-biboratafulvene derivative [Li(TMEDA)]2[CH2C(CHB)2-(NiPr2)2] are characterized by X-ray diffraction analysis. It is shown that for trigonal boron B - C(allyl) bond distances (typically 160 ± 1 pm) are significantly larger than B - C(alkyl) distances (typically 158 + 1 pm).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250105
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  • 3
    Electronic Resource
    Electronic Resource
    Trinuclear Homo- and Heterometallic Complexes of a Doubly Bridged Cyclopentadienyl Ligand (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 31-35 
    Details
    ISSN: 0009-2940
    Keywords: Cyclopentadienyl ligand, doubly bridged ; Cyclopentadienyl complexes, trinuclear ; Polymers, organometallic ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal complexes that are derived from the doubly bridged cyclopentadiene system 2,2,8,8-tetramethyl-2,8-disilatricyclo[7.3.0.03,7] dodeca-3,5,9,11-tetraene (LH2) are investigated. The dilithio salt of this compound (LLi2) reacts with (Me3Si)3-C5H2FeCl to give, amongst other products, the trinuclear ferrocene [(Me3Si)3C5H2FeL]2Fe (2). A starting material well suited for the selective preparation of similar trinuclear complexes is the mononuclear ferrocene (HL2)Fe (3) which is formed by reaction of HLLi with iron(II) chloride. Reaction of dilithiiated 3 with trimethyltin chloride yields (Me3SnL)2Fe (4). Cocomplexation of dilithiated 3 and Cp*Li (Cp*=C5Me5) with iron(II) chloride leads to the trinuclear ferrocene (Cp*FeL)2Fe (5). By reaction of 3 with octacarbonyldicobalt the heterometallic complex [(CO)2CoL]2Fe (6) is obtained, which yields [(CO)I2CoL]2Fe (7) by oxidative decarbonylation with iodine. The stereochemistry of the complexes presented is discussed. The trinuclear complexes 2, 5, 6, and 7 are model systems for organometallic polymers with spatially directed structures, whose stability even in mixed-valence states is evidenced by the mass spectra of these complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250106
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  • 4
    Electronic Resource
    Electronic Resource
    Metallkomplexe von Farbstoffen  -  Übergangsmetall-Komplexe mit 2-(1,3-Dioxo-2-indanyliden)benzimidazolinen (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 61-66 
    Details
    ISSN: 0009-2940
    Keywords: Benzimidazoline, 2-(1,3-dioxo-2-indanylidene)-, as chelate ligand ; Copper complexes ; Nickel complexes ; Palladium complexes ; Platinum complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal Complexes of Dyes  -  Transition Metal Complexes of Mono- and Dianions of 2-(1,3-Dioxo-2-indanylidene)-benzimidazolines2-(1,3-Dioxo-2-indanylidene)benzimidazolines (L) (1 - 6) react with metal salts and chloro-bridged complexes in the presence of NaH to give the mono and bis-N,O-chelate complexes (L  -  H+)2M (M=Cu, Pd, Ni) (7 - 9), (L  -  H+)M(PR3)Cl (M=Pd, Pt; 10 - 15 and (L  -  2H+)[Pt(PEt3)Cl]2 (16, 17). The electronic spectra of the bis(chelate) complexes show a large bathochromic shift of the absorptions in the visible region as compared to the free ligands. The structures of (L  -  H+)Pd(Cl)-(PnBu3) (10) and of (L  -  2H+)[Pt(Cl)PEt3)]2 (16) have been determined by X-ray crystallography. The two heterocyclic planes in 16 are bent along the elongated central C=C bond [143.2(12)pm] which gives a hip-roof-like structure.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250111
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  • 5
    Electronic Resource
    Electronic Resource
    Metal Complexes with Tetrapyrrole Ligands, LXI. Structure and Products of Electrochemical Oxidation of Zirconium(IV) and Hafnium(IV) Bisporphyrinate Double-Deckers (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 107-115 
    Details
    ISSN: 0009-2940
    Keywords: Zirconium porphyrins ; Hafnium porphyrins ; Porphyrin double-deckers ; Metal bisporphyrinates ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical oxidation of zirconium and hafnium double-deckers M(P)2 (M=Zr, Hf; P=OEP, TPP) (Scheme 1)2) leads to mono- and dications which show near infrared absorption bands which are of ≈ 2000 cm-1 higher energy than those of the corresponding cerium double-decker cations. [Zr(OEP)2]X, [Zr(OEP)2]X2, and [Zr(TPP)2]X (X=ClO4- and PF6-) are isolated after electrochemical oxidation and are characterized by IR and NMR spectroscopy. Magnetic susceptibility measurements (2 K 〈 T 〈 300 K) of the solids confirm the strong coupling of the electron spins in the diamagnetic dication salt [Zr(OEP)2][ClO4]2. The molecular structure of Zr(OEP)2 is elucidated by an X-ray structural analysis.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250118
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  • 6
    Electronic Resource
    Electronic Resource
    Mehrfachbindungen zwischen Hauptgruppenelementen und übergangsmetallen, CII. Flüchtige MN4-Metallkomplexe von Niob und Tantal mit Dimethylsilyl-Substituenten (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 117-118 
    Details
    ISSN: 0009-2940
    Keywords: Imido ligands ; Amido ligands ; Niobium complexes ; Tantalum complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Multiple Bonds between Main-Group Elements and Transition Metals, CII[1].  -  Volatile MN4 Metal Complexes of Niobium and Tantalum Containing Dimethylsilyl SubstituentsNiobium and tantalum complexes 4a and 4b of formula (Me2SiH)N=M[N(SiHMe2)2]3 (a: M=Nb; b: M=Ta) are formed from lithium bis(dimethylsilyl)amide and either MOCl3 (2a,b) or MCl5 (3a,b). No β-hydrogen decomposition of these compounds occurs under normal conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250119
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  • 7
    Electronic Resource
    Electronic Resource
    Organomolybdän- und Organowolfram-Reagenzien, II. über den carbonylolefinierenden μ-Methylenkomplex aus Mo2Cl10 und vier äquivalenten Methyllithium (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 143-148 
    Details
    ISSN: 0009-2940
    Keywords: Carbonyl olefination ; μ-Methylene complexes ; Molybdenum complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organomolybdenum and Organotungsten Reagents, II.  -  On the Carbonyl-Olefinating μ-Methylene Complex from Mo2Cl10 and Four Equivalents of MethyllithiumMo2Cl10 reacts at  -  70°C with 4 equivalents of methyllithium to give a methylated thermolabile molybdenum complex. At higher temperatures it forms a thermolabile carbonyl-olefinating reagent which according to NMR data is the μ-CH2 complex Cl3Mo(μ-CH2)2MoCl3 (2). Reactions of 2 with aldehydes, ketones, azomethines, and epoxides are described.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250123
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  • 8
    Electronic Resource
    Electronic Resource
    Alkyleisen- und Alkylcobalt-Reagenzien, III. Nichtstabilisierte Eisenalkyle: Bildung, Nachweis und Chemoselektivität (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 163-169 
    Details
    ISSN: 0009-2940
    Keywords: Iron ; organo reagents ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Alkyliron and Alkylcobalt Reagents, III.  -  Nonstabilized Ironalkyls: Formation, Detection, and ChemoselectivityThe crystalline ate complex Me4FeLi2(Et2O)2 (1 d) described in the literature as well as the complexes MeFeCl (1a), Me2Fe (1b), Me3FeLi (1c), nBu2Fe (2 a), nBu4FeLi2 (2b), nOct2Fe (3a), nOct3FeLi (3b), and nOct4FeLi2 (3c) are prepared in situ by transmetallation of MeLi, nBuLi, and nOctLi with FeCl2 (readily available by in situ reduction of FeCl3 with MeLi). All these complexes have been subjected to reaction with organic substrates for the first time. Evidence for this transmetallation has been furnished by a novel test (referred to as “β-bromostyrene-ketone test”). In this test, involving addition of β-bromostyrene (4) and 4-methylpentan-2-one (5), the alkyllithium compounds alkylate selectively only the ketone and the alkyliron compounds almost exclusively the β-bromostyrene. The high preference of the alkyliron reagents for the alkylation of the β-bromostyryl residue has been utilized for regioselective butylations and octylations of 1-{4-[(Z)-2-bromoethenyl]phenyl}-ethanone (6). Moreover, in competition reactions with benzaldehyde/4-methylpentan-2-one the alkyliron reagents have been found to react usually specifically with aldehydes. The decomposition temperatures of the reagents 1a,b,c and 2b in THF have been determined to be 0, -10, 25, and -20°C, respectively.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250127
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  • 9
    Electronic Resource
    Electronic Resource
    Übergangsmetallaktivierte organische Verbindungen, XXXV. Ortho-Alkylierungen von aromatischen Azoverbindungen mit Alkyllithium-Reagenzien und Lithiumtrimethylferrat(1-) (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 153-155 
    Details
    ISSN: 0009-2940
    Keywords: Lithium, organo compounds ; Iron, organo compounds ; Azo compounds ; ortho-Alkylation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transitional-Metal-Activated Organic Compounds, XXXV.  -  ortho-Alkylation of Aromatic Azo Compounds with Alkyllithium Reagents and Lithium Trimethylferrate(1-)Whereas methyllithium reacts with 4-(dimethylamino)-, 4-amino-, and 4-methoxyazobenzene, respectively, by ortho-methylation of the electron-rich phenyl residue of the azo compound, (CH3)3FeLi ortho-methylates the less electron-rich phenyl group of 4-(dimethylamino)azobenzene. A mechanistic rationalisation is given for both reaction modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250125
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  • 10
    Electronic Resource
    Electronic Resource
    7-Substituierte Cycloheptatriene als Dienophile in der Diels-Alder-Cycloaddition mit inversem Elektronenbedarf (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 171-176 
    Details
    ISSN: 0009-2940
    Keywords: Cycloheptatriene ; Norcaradiene ; Valence isomerization ; [4 + 2] Cycloadditions ; Site selectivity ; Valence isomer selectivity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 7-Substituted Cycloheptatrienes as Dienophiles in the Diels-Alder Cycloaddition With Inverse Electron DemandA series of 7-substituted cycloheptatrienes 1, including CN, CO2CH3, C6H5, C(CH3)3, CH3, CH(OCH3)2, H, N(CH3)2 groups has been submitted to inverse [4 + 2] cycloaddition with 3,6-bis(trifluoromethyl)-1,2,4,5-tetrazine (5). Reaction of 5 with π-acceptor-substituted cycloheptatrienes such as 1a-c leads exclusively to cyclopropa[f]phthalazines 8 and 9, whereas 7-alkylcycloheptatrienes 1d-f give mixtures of cyclopropa[f]phthalazines 10 and 12 and 7H-cyclohepta[d]pyridazines 11 and 13. Moreover, 7-methylcycloheptatriene (1e) yields three further products 19, 20, 21, derived from heptafulvene 16, formed intermediately by dehydrogenation of 1e. In contrast to 1a - f, reaction of 5 with cycloheptatriene (1g) yields the corresponding 5H-cyclohepta[d]pyridazine 22 quantitatively. Surprisingly, no [4 + 2] cycloadducts are observed with the π-donor-substituted cycloheptatriene 1h. Instead, the indazol 27 and the triazoles 25 and 28 are formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250128
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