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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and Properties of (Aminomethyl)nickel Complexes. [{Li(OEt2)}2Ni(CH2NC5H10)4]: The First Structurally Characterized Homoleptic Aminomethyl Complex of a Transition Metal (1995)
    s.l. : American Chemical Society
    Inorganic chemistry 34 (1995), S. 2625-2628 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00114a021
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  • 2
    Electronic Resource
    Electronic Resource
    The First Heck Reactions with 1-Chloroalk-1-ynes: Syntheses of Enynes with Isolatedand Conjugated p-Systems (1998)
    Springer
    Monatshefte für Chemie 129 (1998), S. 1329-1334 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Heck reaction; 1-Chloroalk-1-ynes; Cycloalkenes; Cycloalkadienes; Enynes..
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Heck-Reaktion zwischen 1-Chlor-2-phenylacetylen und Cycloalkenen oder Cycloalkadienen ergibt phenylethinylsubstituierte Cycloalkene als normale Heck-Produkte sowie 1,3-diphenylprop-2-inyliden- und (cycloalkenyl)phenylmethyliden-substituierte Bicyclen als Tandemprodukte der Reaktion von ClC*CPh und Cycloalkenen im Molverhältnis von 1:2 bzw. 2:1..
    Notes: Summary.  The Heck reaction between 1-chloro-2-phenylacetylene and cycloalkenes or cycloalkadienes affords phenylethynyl substituted cycloalkenes as regular Heck products as well as 1,3-diphenylprop-2-ynylidene and (cycloalkenyl)phenylmethylidene substituted bicyclic compounds as tandem products by reaction of ClC*CPh and the cycloalkene in a ratio of 1:2 and 2:1, respectively..
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010146
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  • 3
    Electronic Resource
    Electronic Resource
    Crown ether adducts of olefin complexes of Zeise's salt type – [K(18-crown-6)][PtCl3(olefin)] (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 67-70 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract [K(18-cr-6)]2[Pt2Cl6] reacts with olefins in CH2Cl2 to give crown ether adducts of olefin complexes of Zeise's salt type [K(18-cr- 6)][PtCl3(olefin)] (2) [olefin: EtCH=CH2 (2a), cis-MeCH=CHMe (2b), trans-MeCH=CHMe (2c), nPrCH=CH2 (2d), cis-EtCH=CHMe (2e), trans-EtCH=CHMe (2f), nBuCH=CH2 (2g), cis-nPrCH=CH-Me (2h), cis-EtCH=CHEt (2i), trans-EtCH=CHEt (2j), cyclohexene (2k), PhCH=CH2 (2l)]. The complexes were characterized by microanalysis, n.m.r. (1H, 13C) and i.r. spectroscopy. The crystal structures of the cis-but-2-ene (2b) and cis-pent-2-ene complexes (2e) were determined by single-crystal X-ray analyses. The Pt atom is square-planar, coordinated by three chloro ligands and the olefin ligand [interplanar angle PtCl3/Pt(C=C) 89.6° (2b), 86.6° (2e)]. The C=C bond length is 1.38(1)Å (2b) and 1.32(2)Å (2e), respectively. The substituents (Me, Et) on the double bond are bent back away from Pt [torsion angles C–C=C–Pt 109(2)–110.7(8)°]. There are close contacts of the [K(18- cr-6)]+ cations both to the trans and one of the cis chloro ligands [K···Cl 3.208(2)/3.230(2)Å (2b); 3.220(5)/3.370(5)Å (2e)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006952604621
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of [PtMe3L(H2O)]BF4·H2O (L=3-O-acetyl-1,2-O-isopropylidene-α-D-glucofuranose) (1999)
    Springer
    Chemistry of heterocyclic compounds 35 (1999), S. 984-991 
    Details
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reaction of [PtMe3(Me2CO)3]BF4 (1) with 3-O-acetyl-1,2;5,6-di-O-isopropylidene-α-D-glucofuranose in acetone affords [PtMe3L]BF4 (2) (L=3-O-acetyl-1,2-O-isopropylidene-α-D-glucofuranose). In wet methylene chloride, complex2 transforms to [PtMe3L(H2O)]BF4·H2O (3). Complex3 was characterized by microanalysis and NMR spectroscopy (1H,13C,195Pt). The X-ray structure analysis (monoclinic, P21, a=10.529(3) Å, b=7.322(2) Å, c=14.668(4) Å, Z=2) reveals that 3-O-acetyl-1,2-O-isopropylidene-α-D-glucofuranose acts as a neutral bidentate ligand which is coordinated via two hydroxyl groups (κ2O5,6 coordination). The five-membered 1,3,2-dioxaplatina rings exhibit an envelope conformation. The coordination sphere of platinum is completed by H2O ligand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02252168
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  • 5
    Electronic Resource
    Electronic Resource
    An Effecient and Safe Method for the Preparation of Alkyl Vinyl Sulfides (1996)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 172-174 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19963380133
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  • 6
    Electronic Resource
    Electronic Resource
    On the Twofold Heck Reaction of 4-vinylcyclohexene and p-dihalobenzenesDedicated to Prof. K.-H. Thiele on the Occasion of his 65th Birthday (1995)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 375-378 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The palladium-catalyzed reaction of iodobenzene, p-haloiodobenzenes (p-C6H4IX′; X′=F, Cl, Br, I) and p-dibromobenzene with 4-vinylcyclohexene (Heck arylation reaction of olefins) was investigated with Pd(OAc)2/PR3/Et3N (R=phenyl, o-tolyl) as a classical catalyst system and with Pd(OAc)2/KOAc/[BzEt3N]Cl in DMF as a phase-transfer catalyst system, respectively. Iodobenzene reacts with 4-vinylcyclohexene to give (E)-2-(cyclohex-3-enyl) vinylbenzene (1) as main product. p-Haloiodobenzenes react with 4-vinylcyclohexene to give (E)-p-halo-2-(cyclohex-3-enyl) vinylbenzene (3), p-halo-1-(cyclohex-3-enyl) vinylbenzene (4) or (E,E)-p-bis[2-(cyclohex-3-enyl)vinyl]benzene (5) depending on the reaction conditions and the catalyst system used. The phase-transfer catalyst system is less reactive but more selective. A reaction temperature of 80°C is necessary for reaction with p-dibromobenzene. The investigations demonstrate the much higher reactivity of the exocyclic double bond of 4-vincylcyclohexene in comparison with the endocyclic one.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19953370180
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  • 7
    Electronic Resource
    Electronic Resource
    Anionic Tetranuclear Platina-β-diketonates of Platina-β-diketones - Organometallic Analogues of Platinum Blue Complexes (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 1655-1659 
    Details
    ISSN: 1434-1948
    Keywords: Metalla-β-diketones ; Platinum ; Bis(acyl)-bridged complexes ; Platinum blues ; Metal-metal interactions ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The platina-β-diketone [Pt2{(COMe)2H}2(μ-Cl)2] (1) reacts with aliphatic amines [nBuNH2, (iPr)2NH, NEt3], N-methylaniline, and N,N-dimethylaniline, as well as with strong bases, such as a proton sponge or [NMe4]OH, in an equimolar ratio to give the anionic platina-β-diketonato complexes of platina-β-diketones [BH]2[{Cl2Pt(μ-COMe)2Pt[(COMe)2H]}2] (3) {B = nBuNH2 (3a), (iPr)2NH (3b), NEt3 (3c), PhNHMe (3d), PhNMe2 (3e), C10H6(NMe2)2 [1,8-bis(dimethylamino)naphthalene] (3f) and [NMe4]2[{Cl2Pt(μ-COMe)2Pt[(COMe)2H]}2] (3g)}. All complexes were characterized by microanalysis, and by 1H-NMR and IR spectroscopy. X-ray structure analyses reveal that in the solid state the complexes 3a · 0.5 CH2Cl2 and 3g · 2 CH2Cl2 consist of tetranuclear dianions with zigzag Pt4 chains [Pt-Pt-Pt angle: 122.92(3)° (3a), 119.30(6)° (3g)]. The central Pt···Pt distances [3a: 3.171(1) Å, 3g: 3.176(1) Å] give evidence for closed shell d8-d8 interactions. Thus, these bis(acyl)-bridged complexes can be regarded as organometallic analogues of platinum blue complexes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Zum Heteroatomeinfluß in α- und β-funktionalisierten AlkylübergangsmetallkomplexenProfessor Rudolf Taube zum 60. Geburtstag gewidmetWeitere Abkürzungen: Bz = Benzyl; Cp n5-C5H5; Cp* = n5-C5Me5; cy = Cyclohexyl; H2pe = Phthalocyanin; tmeda = N,N,N′,N′-Tetra-methylethylendiamin; X = Halogen. (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 104 (1992), S. 392-412 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vor etwa zwanzig Jahren sind in den Arbeitskreisen von Wilkinson und Lappert die ersten homoleptischen Trimethylsilylmethylübergangsmetallkomplexe synthetisiert worden, woraus sich wesentliche Impulse für das Verständnis von thermodynamischer und kinetischer Stabilität der Übergangsmetall-Kohlenstoff-σ-Bindung ergeben haben. Aufgrund ihrer relativ hohen thermischen Stabilität unterscheiden sie sich drastisch von den seit etwa dreißig Jahren bekannten Köbrichschen Lithiumcarbenoiden XCH2Li, die sich durch eine herausragende Reaktivität auszeichnen. Beide Verbindungsklassen zeigen, daß die Einführung eines Heteroatoms in einen Alkylliganden Struktur, Stabilität und Reaktivität von Alkylmetallverbindun-gen grundsätzlich beeinflussen kann und daß sich völlig neuartige Reaktionsmöglichkeiten ergeben können. α- und β-heteroatomsubstituierte Alkylübergangsmetallkomplexe mit der Struktureinheit [M-CH2-Y] bzw. [M-CH2-CH2-Y] (Y ist ein Element der Gruppen 14-17, Y ≠ C[**]) sind aufgrund ihres einfachen und übersichtlichen Aufbaus besonders geeignet, den Einfluß des Heteroatomzentrums (neutral/kationisch, koordinativ gesättigt/Lewis-basisch) auf Struktur, Stabilität und Reaktivität in Abhängigkeit vom Komplextyp, von der Natur des Metalls M und von der Zahl der Methylengruppen zwischen M und Y zu analysieren. Insgesamt haben diese Komplexe aufgrund der vielfältigen stabilisierenden und destabilisierenden Einflüsse des Heteroatoms sehr unterschiedliche Reaktivitäten und Stabilitäten. Diese Beobachtungen spiegeln sich eindrucksvoll auch in der Homogenkatalyse wider, in der funktionalisierte Alkylmetallverbindungen als Zwischenstufen nachgewiesen worden sind, sowie im elektronischen Einfluß von funktionalisierten Alkylliganden, der maßgeblich durch das Heteroelement determiniert ist.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19921040405
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and Characterization of cis- and trans-Tetrachlorobis(pyridine)platinum(IV)Dedicated to Professor Siegfried Engels on the Occasion of his 65th Birthday (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 603-607 
    Details
    ISSN: 0044-2313
    Keywords: Platinum complex ; crown ether ; Raman and IR data ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Charakterisierung von cis- und trans-Tetrachlorobis(pyridin)platin(IV)[Na(15-cr-5)]2[PtCl6] · 2 H2O reagiert mit Pyridin in Wasser als Lösungsmittel zu cis-[PtCl4(py)2] (1) und in MeCN, DMF sowie in CH2Cl2 zu trans-[PtCl4(py)2] (2). Die Substitutionsreaktion wird durch Bestrahlung mit sichtbarem Licht beschleunigt. Sowohl gelöst in DMSO, DMF und MeCN als auch bei 503 K im festen Zustand isomerisiert 1 zu 2.1 und 2 sind umfassend IR- und ramanspektroskopisch charakterisiert worden. Die Molekülstruktur des trans-Isomeren 2 wurde auch durch Röntgeneinkristallstrukturunterschung ermittelt (monoklin, C2/m, a = 14.143(5), b = 7.171(3), c = 7.199(3) Å, β = 116.42(4)°, Z = 2, R1 = 0.0331, wR2 = 0.0727). 2 weist angenähert D2h Symmetrie auf, wobei die beiden trans-ständigen Pyridinliganden in einer Ebene liegen. Nach quantenchemischen Berechnungen ist 2 (D2h-Symmetrie) um 48.28 kJ/mol stabiler als 1 (C2v-Symmetrie).
    Notes: [Na(15-cr-5)]2[PtCl6] · 2 H2O reacts with pyridine in water as solvent to give cis-[PtCl4(py)2] (1) and in MeCN, DMF or in CH2Cl2 to give trans-[PtCl4(py)2] (2). The substitution reaction can be accelerated by irradiation with visible light. 1 isomerizes to give 2 in DMSO, DMF and MeCN as well as in solid state at 503 K.1 and 2 were thoroughly characterized IR and Raman spectroscopically. The molecular structure of the trans isomer 2 was also established by X-ray structure analysis (monoclinic, C2/m, a = 14.143(5), b = 7.171(3), c = 7.199(3) Å, β = 116.42(4)°, Z = 2, R1 = 0.0331, wR2 = 0.0727). 2 has nearly D2h symmetry with two trans standing pyridine ligands lying in a plane. According to quantum chemical calculations, 2 (D2h symmetry) is more stable (48.28 kJ/mol) than 1 (C2v symmetry).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230194
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Synthese und Charakterisierung von Platincyclobutadien-Komplexen durch Reduktion von Hexachloroplatinsäure (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2393-2396 
    Details
    ISSN: 0009-2940
    Keywords: Platinum complexes ; Cyclobutadiene complexes ; Alkyne dimerization ; Catalysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Characterization of Platinumcyclobutadiene Complexes by the Reduction of Hexachloroplatinic AcidHexachloroplatinic acid is reduced in 1-butanol in the presence of an alkyne R-C≡C-R′ (R, R′ = Me, Et, nPr) to give platinumcyclobutadiene complexes [PtCl2(C4R2R2′)] (1). H[PtCl3(CH3CH2CH=CH2)] (2) is an intermediate which is isolated as bis(triphenylphosphoranylidene)ammonium salt (PPN-salt) [PPN][PtCl3(CH3CH2CH=CH2)] (3). The molecular structure of [PtCl2(C4Et4)] (1b) shows in the solid state a planar cyclobutadiene ring with internal bond angles of 93(3) and 87(2)°. The Pt-C bond lengths are 208(2) and 210(2) pm. The ethyl groups are pushed out of the ring plane, away from the Pt atom, with an angle of 7(2)°.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931261108
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