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  • 1
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    A Question (1954)
    Chicago : Periodicals Archive Online (PAO)
    Chicago review. 8:4 (1954:Fall) 49 
    Details
    ISSN: 0009-3696
    Topics: English, American Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5067-1954-008-04-000008
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  • 2
    Electronic Resource
    Electronic Resource
    2,4,6-Tri-tert-butyl-1,3,5-triphosphabenzene as an η6-Ligand in Transition Metal Complexes (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 83-86 
    Details
    ISSN: 1434-1948
    Keywords: 2,4,6-Tri-tert-butyl-1,3,5-triphosphabenzene ; η6-Triphosphabenzene transition metal complexes ; Displacement reactions ; Phosphorus heterocycles ; Arene complexes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The η6-1,3,5-triphosphabenzene transition metal complexes 12a,b, 14, and 16 have been synthesized for the first time by the displacement of η6-arene ligands (toluene, benzene and naphthalene) with 2,4,6-tri-tert-butyl-1,3,5-triphosphabenzene (9). The new complexes have been fully characterized by a combination of elemental analysis, mass spectrometry, and 1H-, 13C- and 31 P-NMR spectroscopy.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Einkernige Pentalen- und Methylpentalen-Komplexe von Titan, Zirconium und Hafnium (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 1793-1796 
    Details
    ISSN: 0044-8249
    Keywords: Einkernkomplexe ; Hafnium ; Pentalen ; Titan ; Zirconium ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19971091612
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  • 4
    Electronic Resource
    Electronic Resource
    An ein einzelnes Metallatom η8-koordiniertes Pentalen am Beispiel einkerniger Vanadium-komplexe  -  ein neuer Koordinationstyp in der Organometallchemie (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 1790-1793 
    Details
    ISSN: 0044-8249
    Keywords: Einkernkomplexe ; Koordination ; Pentalen ; Strukturaufklärung ; Vanadium ; Chemistry ; General 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/ange.19971091611
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  • 5
    Electronic Resource
    Electronic Resource
    (1-Alken)(trimethylphosphan)zirconocen-Komplexe: Darstellung, Charakterisierung und Reaktivität (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1035-1042 
    Details
    ISSN: 0009-2940
    Keywords: Zirconocene(1-alkene) complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1-Alkene)trimethylphosphine)zirconocenes: Preparation, Characterization, and Reactivity(1-Butene)(trimethylphosphine)zirconocene (1) is prepared in 83% yield by subsequent reaction of zirconocene dichloride with two equivalents of n-butyllithium and trimethylphosphine. Reaction of complex 1 with other alkenes or alkynes, e.g. ethylene, styrene, or tolane indicates that this compound is an ideal starting material for synthezising other (alkene)- or (alkyne)zirconocene complexes, e.g. 2, 3, or 7. Another route to (1-alkene)(trimethylphosphine)zirconocenes, e.g. the 1-propene complex 9 or the 1-pentene complex 10, is the reaction of zirconocene dichloride with 1-alkylmagnesium halide in the presence of trimethylphosphine at room temperature. Spectroscopic investigations 1H-, 13C-, and 31P-NMR spectroscopy) confirm that in solution, complex 1 as well as the other 1-alkene complexes 3, 9, and 10 exist as a mixture of two rotamers 1a, b, 3a, b, 9a, b, and 10a, b in a ca. 4:1 ratio. The structures of the ethylene complex 2 and the styrene complex 3a are also determined by X-ray analyses.
    Notes: Die Reaktion des Zirconocendichlorids mit zwei Äquivalenten n-Butyllithium und Trimethylphosphan liefert (1-Buten)(trimethylphosphan)zirconocen (1) in 83 proz. Ausbeute. Komplex 1 ist ein ausgezeichnetes Ausgansmaterial zur Darstellung weiterer (Alken)- oder (Alkin)zirconocen-Komplexe; so erhält man durch Verdrängung des 1-Butens mit Ethylen, Styrol oder Tolan die Zirconocen-Komplexe 2, 3 oder 7 in hohen Ausbeuten. Eine weitere Darstellungsmethode für (1-Alken)(trimethylphosphan)zirconocen-Komplexe ist die Umsetzung von Zirconocendichlorid mit 1-Alkylmagnesiumhalogeniden in Gegenwart von Trimethylphosphan bei Raumtemperatur; z. B. sind so der 1-Propen-Komplex 9 und der 1-Penten-Komplex 10 gut zugänglich. Spektroskopische Untersuchungen (1H-, 13C- und 31P-NMR) zeigen, daß alle dargestellten (1-Alken)(trimethylphosphan)zirconocen-Komplexe in Lösung bei 0°C als getrennt beobachtbare Rotamerenpaare 1a, b, 3a, b, 9a, b und 10a, b im Verhältnis ca. 4:1 vorliegen. Die Strukturen des Ethylen-Komplexes 2 und des Styrol-Komplexes 3a wurden zusätzlich durch Kristallstrukturanalysen ermittelt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220604
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  • 6
    Electronic Resource
    Electronic Resource
    Synthese und Struktur eines neuen Bis[(trimethylphosphan)titanocen]-Komplexes mit einer verbrückenden C2-EinheitHerrn Professor Wolfgang Beck zum 60. Geburtstag gewidmet. (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 2209-2212 
    Details
    ISSN: 0009-2940
    Keywords: Titanocene complexes ; Cyclopropane, methylene, complexes ; Bis(titanocenyl)acetylene complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of a New Bis[(trimethylphosphan)titanocene] Complex with a Bridging C2 Unit
    Notes: Bis(trimethylphosphane)titanocene (1) reacts with 2-methylene-1,1-diphenylcyclopropane (2) to give red crystalline (η2-2-methylene-1,1-diphenylcyclopropane)(trimethylphosphane)titanocene (3). In solution complex 3 degrades smoothly to form the new Cp2Ti(PMe3) - C2 - Ti(PMe3)Cp2 complex 4, the crystal structure of which has been elucidated by an X-ray analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921251007
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  • 7
    Electronic Resource
    Electronic Resource
    Verschiedenartige Koordinationen bei η2-Alken)-(η5-cyclopentadienyl)organylnickel(II)-Komplexen (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 441-452 
    Details
    ISSN: 0009-2940
    Keywords: (η2-Alkene)(η5-cyclopentadienyl)organylnickel(II) complexes, stability and reactivity of ; Cyclopentadienyl ligands, substituted ; Chelating alkenylcyclopentadienyl ; Nickel complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Various Coordinations in (η2-Alkene)(η5-cyclopentadienyl)organylnickel(II) ComplexesA series of (η2-alkene)(η5-cyclopentadienyl)organylnickel(II) complexes with substituted cyclopentadienyl ligands is synthesized in order to compare the structures, the thermal stabilities, and chemical reactivities. In (allyl)(η5-Cp')Ni compounds the allyl moiety is η3-coordinated when Cp'=C5H5, C5Me5 (1), C5Ph5 (2), indenyl (3), [Hydridotri(pyrazolyl)borato] (4) (as an equivalent of the cyclopentadienyl ligand), and [C5H4((CH2)3CH=CH2)] (22). It is found that the [(η2-alkene)alkyl(η5-Cp')nickel] compounds [Cp'=C5Me5; alkene=C2H4, alkyl=Me (10), Et (9) or alkene=(1 - 2-η2)-1,3-butadiene, alkyl=Me (11); Cp'=C5Ph5; alkene=C2H4, alkyl=Me (12)] are thermally more stable and less reactive than their η5;- C5H5 analogues; the largest increase in thermal stability is observed when the η5-Cp' and the η2-alkene functions are connected by substitution of the cyclopentadienyl ligand with an alkenyl group of suitable chain length. In the case of compounds of the general type [(η5-C5R4((CH2)nCH=CH2))-(ligand)Ni(II)] with Ph3P as the ligand these complexes are cationic [R=H, n=3 (14+) or R=Me, n=2 (17+)]. On the other hand, the compounds with anionic ligands are neutral complexes (R=H, n=3, ligand=methyl (19), ethyl (20), isopropyl (21) or R=Me, n=3 and ligand=iodide (24), bromide (25), methyl (26), ethyl (27)]. In 14+, 17+, 19 - 21 and 24 - 27 the C=C bond of the alkenyl group is η2-coordinated to the nickel atom. X-ray structures have been determined for 4 and 25.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240306
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  • 8
    Electronic Resource
    Electronic Resource
    {Bis[bis(trimethylsilyl)methyl]stannio(II)}bis(η2-ethen)nickel(0) und verwandte Verbindungen, Teil II (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 489-500 
    Details
    ISSN: 0009-2940
    Keywords: Alkenes ; Nickel complexes ; Stannenes ; Metal-metal bonds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: {Bis[bis(trimethylsilyl)methyl]stannio(II)}bis(η2-ethene)nickel(0) and Related Compounds, Part IIThe coordinatively unsaturated (16e) (ethene)nickel(0) stannylene complex (C2H4)2Ni=Sn{CH(SiMe3)2}2 (1) reacts with 1,6-heptadiene with preservation of the Ni=Sn bond to yield quantitatively the 1,6-diene derivative (η2,η2-C7H12)Ni=Sn-{CH(SiMe3)2}2 (2). The alkene ligands of both 1 and 2 are readily displaceable. Compounds 1 and 2 react with butadiene at -50°C by a 4-e oxidation of the metal-metal pair Ni(0)/Sn(II) to Ni(II)/Sn(IV) and concomitant reduction of two butadiene molecules to butenediyl moieties to afford stereo-selectively the 16-e complex Ni-cis-{η3(Ni),η1(Sn)-anti-C3H4CH2}2Sn{CH(SiMe3)2}2 (3). Similarly, the reaction of 1 or 2 with isoprene yields regio- and stereoselectively the derivative Ni-cis-{η3(Ni,η1(Sn)-anti-C3(3-Me)H3CH2}2Sn{CH-(SiMe3)2}2 (4). These reactions imply the cleavage of one formal Ni—Sn bond and the formation of two new Sn—C bonds. Upon reaction of 3 with PMe3 the configuration of the allyl system changes and, again fully stereoselectively, the 18-e addition compound (Me3P)Ni-cis-{η3(Ni),η1(Sn)-syn-C3H4-CH2}2Sn{CH(SiMe3)2}2 (5) is formed. When 5 is treated with BPh3, the phosphane ligand is trapped and, kinetically controlled, Ni-cis-{η3(Ni),η1(Sn)-syn-C3H4CH2}2Sn{CH(SiMe3)2}2 (6) is obtained as a stereoisomer of 3. At 40°C 6 slowly rearranges into the thermodynamically stable stereoisomer Ni-trans-{η3(Ni),η1(Sn)-syn-C3H4CH2}2Sn{CH(SiMe3)2}2 (7). Mild protolysis of 3 with pyridine hydrochloride or hydrobromide affords region and stereoselectively (Me3Si)2CH}2(X)SnNi-(η3-1-MeC3H4)(NC5H5) (X = C1, 8a; Br, 8b). In the course of this protonation reaction one butadiene molecule is eliminated, accompanied by a 2-e reduction of the metal-metal pair Ni(II)/Sn(IV) to Ni(II)/Sn(II) and, at the expense of two Sn—C bonds, reformation of a Ni—Sn bond. All compounds are isolated in high yield and fully characterized by 1H-, 13C-, and 31P-NMR spectroscopy.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270307
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  • 9
    Electronic Resource
    Electronic Resource
    Metallacyclobutene aus η2-Cyclopropen-Komplexen des Titanocens und Zirkonocens (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2165-2170 
    Details
    ISSN: 0009-2940
    Keywords: Titanocene complexes ; Zirconocene complexes ; Cyclopropene complexes ; Metallacyclobutenes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metallacyclobutenes via η2-Cyclopropene Complexes of Titanocene and Zirconocene(η2-Cyclopropene)(trimethylposphane) complexes of titanocene (4, 5) and zirconocene (8) are obtained in good yields by the reaction of 1,2-diphenylcyclopropene (2) or 4,8-dioxaspiro[2.5]oct-1-ene (3) with bis(trimethylphosphane)titanocene (1) and (1-butene)(trimethylphosphane)zirconocene (7), respectively. In solution the new complexes 4 and 8 rearrange smoothly above room temperature to give the metallacyclobutene derivatives 6 and 9. All new compounds were characterized by spectroscopic methods (31P, 1H, 13C NMR), and the crystal structure of 9 was determined by an X-ray analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241004
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  • 10
    Electronic Resource
    Electronic Resource
    Metallabicyclo[3.1.0]hexene und deren Umlagerung zu Vinylmetallacyclobutenen (M=Ti, Zr) (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1541-1550 
    Details
    ISSN: 0009-2940
    Keywords: Titanocene complexes ; Zirconocene complexes ; Metallabicyclo[3.1.0]hexenes ; 4-Vinyl-1-metallacyclobutenes ; Oxidative coupling of alkynes with cyclopropenes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metallabicyclo[3.1.0]hexenes and Their Rearrangement to Vinylmetallacyclobutenes (M=Ti, Zr)Alkyne-metallocene complexes, e.g. the alkynetitanocenes 1a, b, the alkyne(trimethylphosphane)titanocenes 2a, b and the alkyne(trimethylphosphane)zirconocenes 5a-d react readily with 3,3-dimethylcyclopropene (3a) and 3,3-diphenylcyclopropene (3b) to give the corresponding bis(η5-cyclopentadienyl)-metallabicyclo[3.1.0]hexene derivatives 4a-e, (M=Ti) and 6a-g (M=Zr) in high yields. In an analogous manner, metallabicyclo[3.1.0]hexene derivatives of Ti or Zr can be prepared from 1,2-diphenylcyclopropene(trimethylphosphane)metallocenes 9 and 10 and 2-butyne to yield 11 and 12 and from benzyne 3a or 3b to yield 8a and 8b. Some of these metallabicyclo[3.1.0]hexene derivatives rearrange quantitatively to the corresponding 4-(dimethylvinyl)-1-metalla-2-cyclobutene derivates 16 and 17a and 4-(diphenylvinyl)-1-metalla-2-cyclobutenes 15c and 17a-c when they are heated to 60-80°C for several hours. The 4-(diphenylvinyl)-1-titana-2-cyclobutene derivatives 15a-c can also be obtained by reaction of [(2,2-diphenylvinyl)carbene](trimethylphosphane)-titanocen (13) with disubstituted alkynes such as tolane, phenyltrimethylsilylacetylene and bis(trimethylsily)acetylene. With other alkynes, e.g. 2-butyne, 1-butyne, 1-propyne or acetylene, 13 reacts by polymerization of these alkynes; the corresponding 4-vinyl-1-titanacyclobutene derivatives could not be detected in the reaction mixture. All new metallacycles are fully characterized by spectroscopic methods, extensive 1H- and 13C-NMR studies provide unambiguous proof of their structures.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260707
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