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  • 1
    ISSN: 0009-2940
    Keywords: Gold ; Mercury ; Nitroaryl ; Transmetallation ; Biaryl ; C-C Coupling ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 4-Butoxynitrobenzene reacts with [Hg(O2CCF3)2] and LiCl to give [Hg(R)Cl] [R = C6H3NO2-3, OnBu-6 (1)] which is symmetrized by Me4NCl to give [HgR2] (2), the crystal structure of which has been determined. The reaction of 2 with Me4N[AuCl4] affords Me4N[Au(R)Cl3] (3) by a facile transmetallation process. Complex 3 reacts with PPh3 (1:1) to give cis-[Au(R)(PPh3)Cl2] (4). The diaryl complex [-Ph-2)(R)Cl] (5) is obtained by reaction of 3 with [Hg-(C6H4N=NPh-2)2] through a second transmetallation reaction. Complex 5 and PPh3 (1:1) give [AuClPPh3] and the C-C coupling biphenyl RC6H4N=NPh-2 (6).
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0009-2940
    Keywords: Gold ; Silver ; Diphosphane ; Diphosphane Disulfide ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vinylidenebis(diphenylphosphane) reacts with gold(I) or gold(III) compounds to give dinuclear {[{Au(C6F5)]2[(PPh2)2C=CH2{] or [Au{PPh2C(=CH2)Ph2P)]2(ClO4)2] or mononuclear complexes ([Au(C6F5)3(PPh2C(=CH2)Ph2P)]}, respectively. The latter reacts with gold(I) or silver(I) compounds to afford dinuclear [[Au(C6F5)3[PPh2C(=CH2)Ph2P}AuX], X=Cl or C6F5) or trinuclear species {[{Au(C6F5)3{PPh2C(=CH2)Ph2P{]2M]ClO4, M=Au or Ag}. No addition of nucleophiles to the C=C double bond is observed in these complexes, which contain the diphosphane acting as bridging or monodentate ligand. (SPPh2)2C=CH2 reacts with AgClO4 to give [Ag{SPPh2C(=CH2)Ph2PS}]2-(ClO4)2or[Ag[PPh2C(=CH2)Ph2P]2]ClO4. The crystal structure of [Au(C6F5)3{PPh2C(=CH2)Ph2P}Au(C6F5)] has been established by X-ray crystallography, and confirms the expected square planar and linear geometry for the Au111 and Au1 centres, respectively.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 575-578 
    ISSN: 1434-1948
    Keywords: Phosphorus heterocycles ; 2H-Azaphosphirene complexes ; Carbene complexes ; Tungsten ; Cyclizations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The syntheses of 3-heteroaryl-substituted 2H-azaphosphirene pentacarbonyltungsten complexes are reported. The products were characterized by multinuclear NMR spectroscopy (1H, 13C, 15N, 31P, 183W); the structure of the 3-N-methylpyrryl-substituted 2H-azaphosphirene complex was determined by single-crystal X-ray structure analysis.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-1948
    Keywords: Phosphorus heterocycles ; 2H-Azaphosphirene complexes ; Water-soluble P ligands ; Tungsten ; Cyclizations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermal ring-opening of [{2-bis(trimethylsilyl)methyl-3- phenyl-2H-azaphosphirene-ĸP}pentacarbonyltungsten(0)] (8a) in the presence of dimethyl acetylenedicarboxylate (DMAD) led to the 2,3-bifunctionalized 1H-phosphirene complex 9a and the 4-phenyl-substituted 2H-1,2-azaphosphole complex 10a, the latter as a by-product. If a small amount of benzonitrile was added, complex 10a was obtained as the main product, along with a small amount of the decomplexed 2H-1,2-azaphosphole 11, which could not be isolated. Reaction of complex 10a with elemental sulfur furnished the corresponding PV sulfide 13. When the ring-opening of complex 8a was performed in the presence of two equivalents of DMAD and two equivalents of dimethyl cyanamide, we obtained the 4-dimethylamino-substituted 2H-1,2-azaphosphole complex 10b, together with the diastereomeric Δ3-1,3,2-oxazaphospholene complexes 14a,b. On reaction of [{2-pentamethylcyclopentadienyl-3-phenyl-2H-azaphosphirene-ĸP}pentacarbonyltungsten(0)] (8b) and DMAD in toluene, the corresponding 1H-phosphirene complex 9b was only formed as a transient species and the P-coordinated P,C-cage compound 15 was the final product. Using benzonitrile as solvent, the 4-phenyl-substituted 2H-1,2-azaphosphole complex 10c was obtained, together with the 7-aza-1-phosphanorbornadiene complex 16, the latter through partial decomposition of 10c coupled with rearrangement and a Diels-Alder reaction; the ratio 10c/16 was found to depend strongly on the molar ratio of complex 8b to DMAD. A cycloaddition reaction of the 2,3-bifunctionalized 1H-phosphirene complex 9a with 2,3-dimethylbutadiene furnished the bicyclic phosphirane complex 19, along with a small amount of the noncoordinated bicyclic phosphirane 20. Reaction of complex 9a with diethylamine yielded the phosphirane complex 21 as a 1,2-addition product, the diorganophosphane complex 22 through ring-opening of 9a, and the 3,4-functionalized 1,2-dihydro-1-phosphet-2-one complex 23 through an unprecedented ring-expansion reaction; the products 21, 22, 23 were formed in a ratio of ca. 1:1:1. The structures of the 1H-phosphirene complex 9a, the 4-dimethylamino-substituted 2H-1,2-azaphosphole complex 10b, the bicyclic phosphirane complex 19, the phosphirane complex 21, and the 1,2-dihydro-1-phosphet-2-one complex 23 have been determined by single-crystal X-ray diffraction analysis.
    Additional Material: 4 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 257-261 
    ISSN: 1434-1948
    Keywords: Phosphorus heterocycles ; 2H-Azaphosphirene complexes ; Carbene complexes ; Tungsten ; Cyclizations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High-yield synthesis of para-substituted pentacarbonyl(3-phenyl-2H-azaphosphirene)tungsten complexes is reported, using a multi-step rearrangement reaction. Spectroscopic and mass-spectrometric data of these heterocyclic complexes are discussed; the 31P-NMR-chemical shifts clearly reflect the electronic influence of the para-phenyl substituents and the correlation with Hammett σp-constants is almost linear.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1103-1110 
    ISSN: 1434-1948
    Keywords: Amines ; Aurophilicity ; Gold ; Hydrogen bonds ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Various gold(I) complexes of aliphatic amines have been prepared by the reaction of chloro(tetrahydrothiophene)gold(I) with the respective amines. The stability of these complexes can be attributed partly to the formation of hydrogen bonds involving the N-H functions, and partly to aurophilic interactions. Analysis of these secondary contacts suggests an inverse correlation between lengths of aurophilic interactions and hydrogen bonds.
    Additional Material: 11 Ill.
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  • 7
    ISSN: 1434-1948
    Keywords: Carbene complexes ; Tungsten ; Phosphorus ; 2H-Azaphosphirene complexes ; Cyclization ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The first syntheses of pentacarbonyl[2-(pentamethyl-2,4-cyclopentadien-1-yl)-2H-azaphosphirene]tungsten complexes are reported, using a one-pot reaction of dichloro(pentamethyl-2,4-cyclopentadien-1-yl)phosphane (Cp*PCl2) with triethylamine and {[amino(aryl)carbene]pentcarbonyltungsten(0)}. [Pentamethyl-2,4-cyclopentadien-1-yl]phosphanediyl-bridged dinuclear carbene complexes are formed as long-lived intermediates, which, by elimination and rearrangement reactions, led to the final products. If traces of water were present, then by-products were formed; in one case, a dinuclear carbene complex with a P(Cp*)-O-P(Cp*) bridging unit was isolated. Under ordinary reaction conditions 2H-azaphosphirene complexes are slowly transformed into {pentacarbonyl[chloro(pentamethyl-2,4-cyclopentadien-1-yl)phosphane]tungsten(0)}. NMR-spectroscopic and single-crystal X-ray structural data of some dinuclear carbene complexes and 2-(pentamethyl-2,4-cyclopentadien-1-yl)-2H-azaphosphirene complexes are presented.
    Additional Material: 6 Ill.
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  • 8
    ISSN: 0044-8249
    Keywords: Carborane ; Cluster ; Gold ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0044-8249
    Keywords: Alkinkomplexe ; Aurophilie ; Gold ; N-Liganden ; Supramolekulare Chemie ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0044-2313
    Keywords: Bis(dimesylamido-O)tetraaquametal(II) complexes ; synthesis ; X-ray structures ; isotypic series ; Jahn-Teller distortion ; hydrogen bond pattern ; graph-theoretical analysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polysulfonyl Amines. LXXIII. Metal(II) Dimesylamide Tetrahydrates: The Dimesylamide Anion as a Monodentate O-Ligand and a Tetrafunctional Hydrogen Bond Acceptor in the Isotypic Complexes [M(H2O)4{(CH3SO2)2N}2], where M = Magnesium, Nickel, Copper, or ZincBy treating aqueous HN(SO2CH3)2 solutions with the appropriate metal hydroxides, oxides, or carbonates, the crystalline tetrahydrates M[(CH3SO2)2N]2 · 4 H2O (M = Mg, Ca, Mn, Co, Ni, Cu, Zn, Cd) were obtained and analytically characterized. The crystal structures of the Mg, Ni, Cu and Zn compounds, as determined by single-crystal X-ray diffraction at low temperatures, reveal an isotypic series (triclinic, space group P1, Z = 1). The structures consist of centrosymmetric trans-octahedral [M(H2O)4{(CH3SO2)2N}2] molecules in which the anionic ligand acts as a monodentate O-donor. For the Mg, Ni and Zn complexes, the M—OH2 and M—O(anion) distances lie in the ranges 203-206 pm and 209-214 pm, respectively. The copper compound features a marked Jahn-Teller distortion with Cu—OH2 = 195.8 and 197.7 pm and Cu—O(anion) = 232.5 pm. The cis-angles O—M—O of the four molecules do not deviate appreciably from 90°. The complex units are associated through a highly organized three-dimensional hydrogen bond network in which all the water protons act as donors and the non-coordinating oxygen atoms and the nitrogen atom of the anionic ligand are involved as acceptors. The H-bond pattern is subjected to a graph-theoretical analysis at the first and second levels.
    Notes: Die kristallinen Tetrahydrate M[(CH3SO2)2N] · 4 H2O (M = Mg, Ca, Mn, Co, Ni, Cu, Zn, Cd) wurden durch Neutralisation wäßriger HN(SO2CH3)2-Lösungen mit entsprechenden Metallhydroxiden, -oxiden oder -carbonaten erhalten und analytisch charakterisiert. Nach Aussage von Tieftemperatur-Röntgenstrukturbestimmungen bilden die Verbindungen mit M = Mg, Ni, Cu und Zn eine isotype Reihe (triklin, Raumgruppe P1, Z = 1). Die Strukturen bestehen aus trans-oktaedrischen und inversionssymmetrischen [M(H2O)4{(CH3SO2)2N}2]-Molekülen mit einzähnig O-bindenden anionischen Liganden. Für die Komplexe mit M = Mg, Ni und Zn werden M—OH2- und M—O(Anion)-Bindungslängen im Bereich 203-206 beziehungsweise 209-214 pm beobachtet. Die Kupferverbindung zeigt eine deutliche Jahn-Teller-Verzerrung mit Cu—OH2 = 195,8 und 197,7 pm und Cu—O(Anion) = 232,5 pm. In keinem der vier Moleküle weichen die cis-Winkel O—M—O stark von 90° ab. Die Komplexeinheiten sind über ein hochgradig organisiertes dreidimensionales Wasserstoffbrücken-Netz miteinander verknüpft, in welchem sämtliche Wasserprotonen als Donoren fungieren und die nichtkoordinierenden Sauerstoffatome des anionischen Liganden ebenso wie dessen Stickstoffatom als Akzeptoren wirken. Das H-Brücken-Muster wird einer graphentheoretischen Analyse auf erstem und zweitem Niveau unterzogen.
    Additional Material: 6 Ill.
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