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  • 1
    Electronic Resource
    Electronic Resource
    Bis(pentamethylcyclopentadienyl)keton und -thioketon: Kohlenstoff-Verbindungen mit präformierter Diels-Alder-Geometrie (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 415-420 
    Details
    ISSN: 0009-2940
    Keywords: 1,3-Cyclopentadiene-5-carbonyl chloride, 1,2,3,4,5-pentamethyl- ; 1,3-Cyclopentadiene-5-carbothioyl chloride, 1,2,3,4,5-pentamethyl- ; Ketone, bis(1,2,3,4,5-pentamethyl-1,3-cyclopentadien-5-yl) ; Thioketone, bis(1,2,3,4,5-pentamethyl-1,3-cyclopentadien-5-yl) ; Diels-Alder preformation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(pentamethylcyclopentadienyl) Ketone and Thioketone: Carbon Compounds with Performed Diels-Alder Geometry1,2,3,4,5-Pentamethyl-1,3-cyclopentadien-5-carbonyl chloride (2) is formed in good yields by the reaction of pentamethylcyclopentadienyllithium (1) with phosgene. The corresponding carbothioyl chloride 3 is synthesized by treatment of 1 with thiophosgene. Both acyl chlorides are stable against air and moisture and difficult to attack in SN2-type reactions. Treatment of 2 and 3 with trimethyl(pentamethylcyclopentadienyl)stannane in the presence of boron trifluoride  -  ether leads to bis(1,2,3,4,5-pentamethyl-1,3-cyclopentadien-5-yl) ketone (5) and thioketone (6), respectively. Even at room temperature, 5 and 6 tend to intramolecular [4 + 2] cycloaddition reactions. X-ray crystal structure investigations of 2, 5, and 6 show the steric demand of the pentamethylcyclopentadienyl ligand and explain the untypical chemical behavior of 2 and the easy [2 + 4] cycloaddition reactions of 5 and 6.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260219
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  • 2
    Electronic Resource
    Electronic Resource
    Neue Beobachtungen zur Stereoselektivität von Monoiodcarben-Additionen (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 499-502 
    Details
    ISSN: 0009-2940
    Keywords: Iodocarbene, addition to alkenes ; endo1-Selectivity ; Cyclooctadiene ; Cyclooctatetraene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New Observations Concerning the Stereoselectivity of Monoiodocarbene AdditionsContrary to our earlier claim, CHI gives endo/exo isomer mixtures with cyclooctene. However, only endo1-iodo compounds 7, 8, 10-12 are obtained from COD and COT. Tricyclic compound 7 rearranges partially to bicyclic 9, X-ray structure determinations of 7 and 9 were performed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260229
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  • 3
    Electronic Resource
    Electronic Resource
    Übergangsmetallsubstituierte Acylphosphane und Phosphaalkene, XXI. Isophosphaalkine als μ3-Liganden in Übergangsmetallkomplexen (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1349-1353 
    Details
    ISSN: 0009-2940
    Keywords: Isophosphaalkynes ; Transition metal complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition-Metal-Substituted Acylphosphanes and Phosphaalkenes, XXI.  -  Isophosphaalkynes as μ3-Ligands in Transition Metal ComplexesReaction of the μ-isophosphaalkyne complex (η5-C5H5)2 (CO)2(μ-CO)Fe2(μ-CPMes) (Mes = 2,4,6-Me3C6H2) (2a) with [(Z)-Cyclooctene]Cr(CO)5 or Fe2(CO)9 gives rise to the μ3-isophosphaalkyne complexes (η5-C5H5)2(CO)2(μ-CO)Fe2{μ-CP[M(CO)n]Mes} 3a [M(CO)n = Cr(CO)5] and 4a [M(CO)n = Fe(CO)4]. Similarly (η5-C5H5)2(CO)2(μ-CO)Fe2{μ-CP[Cr (CO)5]C6H2(CF3)3-2,4,6} (3d) is obtained. The metal carbonyl fragments are attached to 2 in a η1-fashion by the lone-pair at the phosphorus. In contrast to this the treatment of 2a with (Ph3P)2Pt(η2-C2H4) affords complex 5a in which 2a serves as an η3-3e ligand towards the PtPPh3 moiety. The molecular structures of 3a and 5a are determined by single-crystal X-ray analysis.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270804
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and Structure of the First Dimetalated Diphosphane Disulfide [(η5-C5Me5)(CO)2FeP(H)(S)]2 (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 441-442 
    Details
    ISSN: 0009-2940
    Keywords: Diphosphane disulfides ; Metallophosphoranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The first transition metal derivative meso-[(η5-C5Me5)(CO)2FeP(H)(S)]2 (2) of the unknown diphosphane disulfide [PH2(S)]2 results from treatment of (η5-C5Me5)(CO)2FePH2 (1) with 1.5 equivalents of elemental sulfur. Compound 2 was characterized by means of spectroscopy (IR, 31P, 31P{1H}, 13C{1H}, 1H NMR) as well as X-ray diffraction analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280419
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  • 5
    Electronic Resource
    Electronic Resource
    Reaction of 1,3-Dialkyl-4,5-dimethylimidazol-2-ylidenes with 2-Bromo-2,3-dihydro-1H-1,3,2-diazaboroles (Alkyl=iPr and tBu)Dedicated to professor Adolf Zschunke on the occasion of his 60th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 705-710 
    Details
    ISSN: 0009-2940
    Keywords: Boron ; Diazaboroles ; Carbenes ; Heterocycles ; Imidazoles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Bromo-2,3-dihydro-1H-1,3,2-diazaboroles (3a-c) were synthesized by cyclocondensation of dilithiated 1,4-diazabutadienes (5a-c) with boron tribromide in hexane. 3a was also obtained by sodium amalgam reduction was conducted in ether solvents, diboroxane (2) resulted as the main product. Compound 3a and 1,3-dialkyl-4,5-dimethylimidazol2-ylidenes (6a, b) underwent halide displacement to afford the borolylimidazolium salts 7a, b. Compounds 2, 3a-c, and 7a, b were characterized by elemental analyses and spectroscopic methods (1H, 11B, 13C NMR; Ir; MS). The molecular structures of 2 and 7a were established by single-crystal X-ray diffraction analyses.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300606
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  • 6
    Electronic Resource
    Electronic Resource
    übergangsmetall-substituierte Acylphosphane und Phosphaalkene, XV. Zur Umsetzung des Phosphaallylkomplexes (η5-C5Me5)(CO)Fe-{η3-P[CH(SiMe3)2](CHC=O)} mit Chalcogenen und Fe2(CO)9 (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 989-996 
    Details
    ISSN: 0009-2940
    Keywords: Phosphaallyl complexes ; Chalcogenes ; Düron, enneacarbonyl ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition-Metal-Substituted Acylphosphanes and Phosphaalkenes, XV. - Reaction of the Phosphaallyl Complex (η5-C5Me5)(CO)Fe{η3-P[CH(SiMe33)2](CHC=O}} with Chalcogenes as well as with Fe2(CO)9The (η3-phoshaalyl)iron complex (η5-C5Me5)(CO)Fe{η3-P(CH(SiMe3)2](CHC=O)} (1) is oxidized by sulfur and selenium to afford the methylenethioxo- and methyleneselenoxophosphorane complexes 4 and 5 with an anti-configuration of the CH(SiMe3)2 substituent relative to iron. The chalcogene atoms are attached to the phosphorus atom of the ligand and do not participate in the bonding to the metal Equivalent amounts of 1 and Fe2(CO)9 lead to the phosphaalkenyl complex 6 with an Fe - C σ bond. On the other hand, a large excess of Fe2(CO)9 converts 1 as well as 6 into the cluster compound 7 featuring the bridging 1-oxa-4-phosphabutadiene ligand (η5-C2Me5)(CO)2Fe - C(O) - CH=P - CH(SiMe3)2. Constitution and configuration of all compounds have been elucidated by spectroscopic methods (IR, 1H, 13C, 31P NMR, and MS). In addition complexes 5 and 7 have been characterized by single crystal X-ray diffraction analyses.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240504
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  • 7
    Electronic Resource
    Electronic Resource
    Bis(pentamethylcyclopentadienyl)methanol: Synthese, Struktur und Derivatisierung (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 107-112 
    Details
    ISSN: 0009-2940
    Keywords: Bis(pentamethylcyclopentadienyl)methanol ; Diels-Alder reaction, intramolecular ; Chloroformate, bis(pentamethylcyclopentadienyl)methanol ; Tosylate, bis(pentamethylcyclopentadienyl)methanol ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(pentamethylcyclopentadienyl)methanol: Synthesis, Structure, and DerivatizationBis(pentamethylcyclopentadienyl) ketone (1) reacts at low temperatures with LiAlH4 to form in good yields (pentamethylcyclopentadienyl)methanol (2) and its corresponding intramolecular Diels-Alder product 3 in a ca. 2:1 ratio. The alcohol 2 is separated from the tetracyclic compound 3 by crystallisation at -70°C from hexane/pyridine as pyridine adduct. The pyridine-free alcohol 2 is available by repeated dissolving of the adduct in hexane and removal of the volatile components in vacuo. The alcohol tends to intramolecular [4 + 2] cycloaddition even at room temperature with formation of 3. A derivatization of 2 is possible by deprotonation with alkyllithium compounds, which leads to the alcoholate 4, and subsequent treatment with phosgen and tosyl chloride, thus affording the chloroformate 6 and the tosylate 7, respectively, in good yields. The thermolabile tosylate 7 decomposes to pentamethylbenzene or, under basic conditions, to the pentacyclic compound 7.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270118
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis, Structure, and Ligand Behavior of the 1,2-Diphosphaferrocene [η5-1,3-tBu2C5H3)(η5{3,4-(Me3Si0)2-5-(Me3Si)P2C3} Fe]Dedicated to Professor Manfred Regitz on the occasion of his 60th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 665-671 
    Details
    ISSN: 0009-2940
    Keywords: 1,2-Diphosphaferrocene ; Carbonylmetal complexes ; Metallo-diphosphapropene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of equimolar amounts of (η5-1,3-tBu2C5H3)(CO)-{3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe]2-FeP(SiMe3)2 with bis(trimethylsilyl)methylenechlorophosphane afforded the 1-metallo-1,2-diphosphapropene (η5-1,3-tBu2C5H3)(CO)2 FeP (SiMe3)P = C(SiMe3)2 (1b). Treatment of 1b with an excess of [(Z)-cyclooctene]Cr(CO)5 furnished 1,2-diphosphaferrocene (η5-1,3-tBu2C5H3)(η5-{1-[Cr(CO)5]-3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe (4b). Chromium complex 4b was freed from the pentacarbonylchromium fragment by heating with 1.5 equiv. of [Fe2(CO)9] in toluene solution at 80-90°C affording sandwich 5. In contrast, treatment of 4c with [Fe2(CO)9] in refluxing n-pentane yielded the trinuclear complex (η5-1,3-tBu2C5H3){η5-1,2-[Fe2(CO)7]-3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe (6). The ligation of sandwich 5 to the [Fe(CO)4] unit in 7 was achieved by irradiation with [Fe(CO)5] in n-pentane solution. A tricarbonylnickel adduct 8 resulted from the reaction of 4b with an excess of [Ni(CO)4] in toluene at ambient temperature. The molecular structures of the complexes 6 and 8 were established by single-crystal X-ray structure analyses. Cyclovoltammetric studies with 4b, 5, and 8 revealed an anodic shift of the oxidation potential when changing from 5 to 8 and 4.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280703
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  • 9
    Electronic Resource
    Electronic Resource
    Übergangsmetall-substituierte Diphosphene, XXVII[1] Synthese und Struktur des Diphosphirans (η5-C5Me5)(CO)2Fe-H[Cr(CO)5] (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1553-1557 
    Details
    ISSN: 0009-2940
    Keywords: Phosphido complexes ; Phosphaalkenes ; Diphosphiranes ; Chromium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition-Metal-Substituted Diphosphenes, XXVII[1]. - Synthesis and Structure of the Diphosphirane (η5-C5Me5)(CO)2Fe-PH[Cr(CO)5(η5-C5Me5)(CO)2FePH2 (5), prepared from (η5-C5Me5)(CO)2Fe-P(SiMe3)2 and ethanol, reacts with one equivalent of ClP = C(SiMe3)2 to give the diphosphirane (η5-C5Me5)(CO)2FePH (8). Compound 8 is converted into the iron chromium complex [(η5-C5Me5)(CO)2Fe-H]Cr(CO)5(9). In contrast, the reaction of 5 with two equivalents of ClP=C(SiMe3)2 results in the formation of the cyclotri-phosphane [(η5-C5Me5)(CO)2Fe-[CH(SiMe3)2] (12). The molecular structure of 9 is elucidated by single-crystal X-ray analysis.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250707
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  • 10
    Electronic Resource
    Electronic Resource
    Übergangsmetall-substituierte Diphosphene, XXVIII. Synthese und Strukturbestimmung der ersten 1,2-Diaza-3,4-diphosphetidine und (2E,8E)-1,7-Dioxa-3,4,9,10-tetraaza-5,6,11,12-tetraphospha-2,8-cyclododecadiene (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1821-1827 
    Details
    ISSN: 0009-2940
    Keywords: Diphosphenyl ligands ; Δ1-1,2,4-Triazoline-3,5-diones ; 1,2-Diaza-3,4-diphosphetidines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition-Metal-Substituted Diphosphenes, XXVIII. - Synthesis and Structures of the First 1,2-Diaza-3,4-diphosphetidines and (2E,8E)-1,7-Dioxa-3,4,9,10-tetraaza-5,6,11,12-tetraphospha-2,8-cyclododecadienes(η5-C5Me5)(CO)2Fe—P = P—Mes*(Mes* = 2,4,6-tBu3C6H2) reacts with one equivalent of the Δ1-1,2,4-triazoline-3,5-diones (2a: R = Ph; 2b: R = 4-EtOC6H4) in benzene to give the first 1,2-diaza-3,4-diphosphetidines 3a, b. When the same reaction is performed in diethylether the novel (2E,8E)-1,7-dioxa-3,4,9,10-tetraaza-5,6,11,12-tetraphospha-2,8-cyclododecadienes 4a, b are isolated as the sole products. The molecular structures of 3a and 4b are established by single-crystal X-ray analysis.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250807
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