GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Synthese und Charakterisierung stabiler Bis(phosphonio)isophosphindolylium-Carbonylmetallate und eines kationischen Bis(phosphonio)isophosphindolylium-Gold-KomplexesHerrn Professor Alfred Schmidpeter zum 65. Geburtstag gewidmet. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 259-266 
    Details
    ISSN: 0009-2940
    Keywords: Bis(phosphonio)isophosphindolylium cation ; Gold complexes ; Bis(phosphonio)isophosphindolylium carbonylmetallates ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Characterisation of Stable Bis(phosphonio)isophosphindolyliumcarbonylmetallates and a Cationic Bis(phosphonio)isophosphindolylium-Gold ComplexHerrn Professor Alfred Schmidpeter zum 65. Geburtstag gewidmet.Reaction of 1,3-bis(triphenylphosphonio)isophosphindolylium bromide, [L+][Br-] (1a), with Tl[Co(CO)4], Na[MoCp-(CO)3], or Na[WCp(CO)3] (5a-c) yields the corresponding ionic isophosphindolylium-carbonylmetallates, 6a-c. Whereas 1a fails to react with neutral metal carbonyls, a mixture of ionic complexes of the type [LAuX+][AuYZ-] (7a, X, Y, Z = Cl or Br) is formed by reaction with two equivalents of AuCl. Treatment of AuCl with the triflate [L+][OTf-] (1b), which is accessible from 1a via anion metathesis, furnishes [LAuCl+][OTf-] (7b). Both the carbonylmetallate 6c and the complex 7b have been characterized by X-ray structure analyses. 7b displays enhanced reactivity as compared to 1b towards MeOH and H2O, forming the addition products 8 and 9a, b, the latter existing as two different diastereomers. Reactions of 7b with LiF, (Me2N)3P=O, and (Et2N)2C=NH), respectively, proceed via ligand exchange to yield equilibrium mixtures containing the cations [L+] and [LAuCl+].
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280309
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Reactions of diaminophosphenium and 1,3,2-diazaphospholenium triflates with silver saltsDedicated to Professor Dr. Marianne Baudler on the occasion of her 75th birthday. (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 465-469 
    Details
    ISSN: 0009-2940
    Keywords: Phosphenium cations ; Silver complexes ; 31P, 109Ag NMR shift correlation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of bis(diisopropylamino)phosphenium triflate (1[CF3SO3]) with silver salts AgY [Y- = CF3CO2- (2a), CF3-SO3- (2b), CH3CO2- (2c)] affords neutral complexes [{(iPr2N)2(Y)P} Ag(OSO2CF3)] (3a-c). While 3a, c are stable up to ambient temperature, 3b is only stable at low temperature and in equilibrium with the cation 1. The constitution of 3a-c was derived from multinuclear (1H, 13C, 31P, 109Ag) NMR spectra. Compound 3a was further studied by X-ray single-crystal diff ractommetry which showed the presence of dimeric units with μ2-bridging triflate ligands and three-coordinate silver atoms with a planar T-shaped coordination geometry. Reaction of 4-chloro-1,3-bis(2,6-dimethylphenyl)-1,3,2-diazaphospholenium triflate (4[CF3SO3]) with 2a, c affords equilibrium mixtures whose 31P- and 109Ag-NMR spectra suggested the presence of silver complexes 5a, c with constitutions similar to those of 3a, c besides unreacted cation 4. No reaction was observed between 4[CF3SO3] and 2b. A common mechanism accounting for the different outcome of the individual reactions will be discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290416
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    [Bis(phosphonio)isophosphindolide]silver ComplexesDedicated to Professor Dr. Rolf Appel on the occasion of his 75th birthday. (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 337-345 
    Details
    ISSN: 0009-2940
    Keywords: Bis(phosphonio)isophosphindolide cations ; Silver complexes ; 31P NMR ; 109Ag NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The outcome of reactions of bis(phosphonio)isophosphindolide salts 1[X] and 6[X] (X- = Cl-, Br-, CF3SO3-) with silver salts AgY (Y- = CF3SO3-, CF3CO2-, CH3CO2-, 1/2 SO4-) depends strongly on the available anions X, Y. If X-, Y- = CF3SO3-, both mononuclear and dinuclear silver complexes are formed which exhibit either μ1,μ1(P) or μ2,η1(P) coordination of the cations 1, 6 to one or to both metals. In solution, dynamic equilibria between both types of products and free 1, 6 were detected by 31P-NMR spectroscopy. Mononuclear (4a, 7) and dinuclear (5a, 8) complexes were isolated as solvates with CHCl3 or THF. If X-, Y- = CF3CO2, only equilibrium mixtures between the free ligands and silver complexes and no isolable products were obtained. 31P-NMR investigations revealed a preference for the formation of dinuclear complexes. Anion metathesis and precipitation of AgX were observed for X- = Cl-, Br-. No coordination of 1, 6 to Ag+ took place in the case of Y- = CH3CO2-, SO42-. The formed complexes were characterised in solution by 31P- and in part by 109Ag-NMR spectroscopy. Complexes 7, 8 were further studied by single crystal X-ray diffraction which revealed the presence of a THF molecule coordinated to silver in both cases. The μ2-coordinated cation 1 is the only bridging ligand in 8, whereas the presence of additional μ2-CF3CO2 ligands was deduced from the results of 31P,31P EXSY measurements in the case of the trifluoroacetato complexes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290315
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Syntheses of 3-Heteroaryl-2H-Azaphosphirene Tungsten Complexes (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 575-578 
    Details
    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
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    Halogenation of Bis(phosphonio)isophosphindolide Salts: Oxidation versus Substitution (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 101-106 
    Details
    ISSN: 1434-1948
    Keywords: Phosphorus heterocycles ; Halogens ; Oxidations ; Electrophilic aromatic substitutions ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(phosphonio)isophosphindolide iodide 1[I] reacts with an equimolar amount of I2 to yield the trihalide 1[I3], while treatment of 1[X] (X = Br, OTf) with excess Br2 furnishes the dibromophosphonium salt 6c[X]. The bromo-substituted bis- (phosphonio)isophosphindolide cations 5a and 5b are identified as intermediates in this reaction; 5b[Br] is also obtained in pure form by reaction of 6c[Br] with Zn or NEt3. Reaction of 1[OTf] with one equivalent of PhICl2 (7) affords the dichlorophosphonium salt 8a[OTf], which undergoes further substitution reactions in the presence of excess 7 and reacts with Me3SiI to give a mixture of 1[OTf] and I2 rather than a substitution product 9[OTf]. The results of a crystal-structure determination of 8a[OTf] are reported and the mechanistic aspects of the different oxidation/substitution reactions are discussed.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Cation Stabilities, Electrophilicities, and “Carbene Analogue” Character of Low Coordinate Phosphorus Cations (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 1087-1094 
    Details
    ISSN: 1434-1948
    Keywords: Phosphenium cations ; Cation stabilities ; Electrophilicity ; Carbene homologues ; Computer Chemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The stabilities of low coordinated phosphorus cations can be expressed in the frame of the HSAB concept by the transferred charge density Δq(N) which a cation receives upon formation of a donor-acceptor adduct with a Lewis base N. This concept allows to differentiate between relative stabilities towards different reaction partners, and to compare the electrophilicities of phosphenium ions to those of isoelectronic carbenes and silylenes. An analysis of substituent influences on Δq(H) in cations [P(R)2]+suggests an increasing stabilizing power of substituents in the series R = Cl 〈 CH3 〈 OH, SH 〈 NH2. The same ordering was derived from isodesmic hydride transfer reactions. Interpretation of population analyses suggests that the individual substituent contributions to cation stabilities result from a balance between π-donation into the empty p(P) orbital and electrostatic stabilization by polar P-R σ-bonds. A further stabilizing effect, which is of similar magnitude as in isoelectronic carbenes or silylenes, may arise from cyclic π-conjugation between a diaminophosphenium fragment and an adjacent double bond. Substituent effects influence further the nature of the frontier orbitals of phosphenium ions, resulting in orbital sequences which resemble those of carbenes, allyl anions, or phospholides, respectively. The absence of frontier orbital related changes in reactivity patterns suggests that in all reactions, including metal complex formation, phosphenium ions behave as purely electrophilic rather than ambiphilic species.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 7
    Electronic Resource
    Electronic Resource
    Reduction of Bis(phosphonio)isophosphindolides to Phosphane-Functionalized Benzo[c]phospholides (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1169-1174 
    Details
    ISSN: 1434-1948
    Keywords: Phosphorus heterocycles ; Phospholides ; Nickel complexes ; Reductions ; NMR spectroscopy ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(phosphonio)benzo[c]phospholides (isophosphindolides) 1a,b have been found to react with magnesium or alkali metal naphthalenides MC10H8 (M = Li, Na, K) with reduction of one or both of the phosphonio groups. The main products are the mono- or bis(phosphanyl)-substituted heterocycles 2, 3, 6, 7, which have been characterized by in situ NMR studies and in some cases isolated. Subsequent reaction of 2 with excess [Ni(CO)4] gave the complex 4, which has been characterized by X-ray diffractometry. Reactions of 1a with alkali metals followed a more complicated course and gave a mixture of 2, 3, and the substitution product 8, which was further reduced to the phosphanido-substituted benzo[c]phospholide 9. The latter could be formed selectively by first converting 1a into 8 by treatment with PhNa and then treating this with lithium. NMR data of the phosphane-substituted benzo[c]phospholides and the structural features of 4 are discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 8
    Electronic Resource
    Electronic Resource
    Theoretisches und Stoffliches. Nichtmetallchemie. Von Thomas. M. Klapötke. Inis C. Tornieporth-Oetting. VCH Verlagsgesellschaft, Weinheim, 1994. 493 S., 238 Abb., 137 Tab., Kart., DM 58,00. ISBN 3-527-29052-4 (1995)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 29 (1995), S. 335-337 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19950290610
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Anorganischer Blumenkohl: funktionelle Hauptgruppenelement-Dendrimere aus Silicium- und Phosphorbausteinen (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 2039-2043 
    Details
    ISSN: 0044-8249
    Keywords: Dendrimere ; Kaskadenreaktionen ; Phosphor ; Silicium ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19971091806
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Synthese, Struktur und Reaktivität eines 2,4-Diphosphino-1,3-diphospha-2,4-disilacyclobutansProfessor Herbert W. Roesky zum 60. Geburtstag gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1951-1957 
    Details
    ISSN: 0044-2313
    Keywords: diphosphadisilacyclobutanes ; x-ray crystallography ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Structure, and Reactivity of a 1,3-Diphosphino-2,4-diphospha-1,3-disilacyclobutanePentamethylcyclopentadienyltrichlorosilane reacts with Li[Al(PH2)4] to give the stable 1,3-diphosphino-2,4-diphospha-1,3-disilacyclobutane 4. Treatment of 4 with Lithium alkyls affords the Lithium phosphide 5 via regiospecific metalation of a ring phosphorus atom, and reaction with t-Bu2Hg proceeds via oxidative P—P bond formation to yield the 1,4-disila-2,3,5,6-tetraphospha-bicyclo[2,1,1]-hexane 6. Cleavage of pentamethylcyclopentadiene is observed during thermolysis of 4 at 200°C. 4-6 were characterised by NMR-spectroscopy, and 4 by an additional crystal structure determination.
    Notes: Pentamethylcyclopentadienyltrichlorsilan reagiert mit Li[Al(PH2)4] zum stabilen 1,3-Diphosphino-2,4-diphospha-1,3-disilacyclobutan 4. Umsetzungen von 4 mit Lithiumalkylen liefern unter regiospezifischer Metallierung eines Ring-Phosphoratoms das entsprechende Lithiumphosphid 5, während bei der Reaktion mit t-Bu2Hg unter oxidativer P—P-Verknüpfung das 1,4-Disila-2,3,5,6-tetraphospha-bicyclo[2,1,1]-hexan 6 erhalten wird. Bei der thermolytischen Zersetzung von 4 wird bei 200°C die Abspaltung von Pentamethylcyclopentadien beobachtet. 4-6 werden durch NMR-spektroskopische Untersuchungen, 4 zusätzlich durch eine Röntgenstrukturanalyse charakterisiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956211120
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...