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  • Electronic Resource  (14)
  • Inorganic Chemistry  (10)
  • Cell & Developmental Biology  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Self-Assembly of Substituted 6-Hydroxy-trans-3-hexenoic Acids - Formation of Extended Ribbon-Like Structures by Hydrogen Bonds (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1029-1034 
    Details
    ISSN: 0009-2940
    Keywords: Hydrogen bonding ; Hydroxy carboxylic acids, self-assembly of ; Crystal engineering ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The substituted 6-hydroxy-trans-3-hexenoic acids 2a and 2b are prepared by an organometallic template reaction involving a sequence of CC coupling reactions between a CO2 equivalent, butadiene, and 3-cyclopenten-1-one or 3,4-diphenyl-3-cyclopenten-1-one, respectively. In the crystal 2a assembles to form an infinite ribbon-type structure, exhibiting an alternating array of 12 and 18 atom-containing loops. The former are each constructed by an alternating CO2H/OH/CO2H/OH sequence, originating from four different monomeric units, that are linked together by means of hydrogen bonds. Two complementary ribbons of 2a are connected by van der Waals interactions to form staples that constitute the microscopic building blocks of the true (2a)n structure in the crystal. Stacks of cyclopentene π bonds are oriented inside the columnar structure of 2a. Acid 2b also forms a related ribbon-like assembly in the solid state. Here the bulky 3,4-diphenylcyclopentadienylidene moieties are oriented laterally at the ribbons, and van-der-Waals interactions with adjacent ribbons construct a three-dimensional hydroxyhexenoic acid network.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290909
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  • 2
    Electronic Resource
    Electronic Resource
    Atomgewichtsbestimmung von Wismut (1924)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 141 (1924), S. 82-94 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde in der vorliegenden Arbeit eine Methode ausgeführt, das Atomgewicht von Wismut zu bestimmen durch Verbrennung einer seiner organischen Verbindungen, des Triphenyls. Im besonderen bestand die Aufgabe darin, eiae brauchbare Darstellungsmethode des Ausgangsmaterials zu ermitteln, um dessen Verwendungsmöglichkeit für eine exakte Analyse zu prüfen. Wie oben gezeigt wurde, konnte die Reindarstellung des Wismuttriphenyls leicht durch Destillation im Hochvakuum erzielt werden, die, wie auch die Sublimation, als die besten Methoden der Reinigung anzusehen sind. Wir erhielten ein absolut reines, durch Schmelz und Siedepunkt identifiziertes Produkt. Die Destillation wurde so geführt, daß der Tiegel, indem das Destillat aufgefangen wurde, im Wägegläschen verschlossen werden konnte, ohne mit der Außenluft in Berührung zu kommen, so daß jede Gefahr einer Aufnahme von Luftfeuchtigkeit vermieden wurde. Eine Verdichtung von Gasen innerhalb des Wismuttriphenyls konnte ebenfalls nicht eintreten, da ja einerseits im Vakuum gearbeitet wurde, andererseits das Destillat zu einer kompakten Masse im Tiegel erstarrte, deren Oberfläche nur klein war. Die Verbrennung selbst, die in Tiegeln aus Quarzglas ausgeführt wurde, verlief leicht und einwandfrei mittels reinster Oxalsäure, die durch mehrmalige Sublimation leicht rein dargestellt werden konnte. Bezüglich des Wismutoxyds ist noch zu sagen, daß es völlig frei von Kohlenstoff war, und wie die Prüfung ergab, keine okkludierten Gase enthielt, auch keinen Unterschied in der Auswage zeigte, wenn es direkt oder erst nach Evakuierung gewogen wurde. Dadurch, daß das Oxyd wieder im RICHARDschen Einfallapparat im Wägegläschen verschlossen wurde, war auch jede Bildung von basischem Salz ausgeschlossen. Von großem Vorteil und für die Arbeit als solche sehr günstig war vor allem, daß die Einwage, die Verbrennung selbst und auch die Auswage in ein- und demselben Gefäß vorgenommen wurde.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19241410106
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  • 3
    Electronic Resource
    Electronic Resource
    Actin isoform utilization during differentiation and remodeling of BC3H1 myogenic cells (1997)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 67 (1997), S. 514-527 
    Details
    ISSN: 0730-2312
    Keywords: smooth muscle ; actin ; myogenesis ; cytoskeleton ; microfilaments ; protein crosslinking ; muscle cells ; cell fractionation ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Mouse BC3H1 myogenic cells and a bi-functional chemical cross linking reagent were utilized to investigate the polymerization of newly-synthesized vascular smooth muscle (α-actin) and non-muscle (β- and γ-actin) actin monomers into native F-actin filament structures during myogenesis. Two actin dimer species were identified by SDS-PAGE analysis of phenylenebismaleimide-cross linked fractions of BC3H1 myoblasts and myocytes. P-dimer was derived from the F-actin-enriched, detergent-insoluble cytoskeleton. Pulse-chase analysis revealed that D-dimer initially was associated with the cytoskeleton but then accumulated in the soluble fraction of lysed muscle cells that contained a non-filamentous or aggregated actin pool. Immunoblot analysis indicated that non-muscle and smooth muscle actins were capable of forming both types of dimer. However, induction of smooth muscle α-actin in developing myoblasts coincided with an increase in D-dimer level which may facilitate actin stress fiber assembly. Smooth muscle α-actin was rapidly utilized in differentiating myoblasts to assemble extraction-resistant F-actin filaments in the cytoskeleton whereas non-muscle β- and γ-actin filaments were more readily dissociated from the cytoskeleton by an extraction buffer containing ATP and EGTA. The data indicate that cytoarchitectural remodeling in developing BC3H1 myogenic cells is accompanied by selective actin isoform utilization that effectively segregates multiple isoactins into different sub-cellular domains and/or supramolecular entities. J. Cell. Biochem. 67:514-527, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Density-Dependent modulatioon of vascular smooth muscle α-actin biosynthetic processing in differntiated BC3H1 myogenic cells (1992)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 50 (1992), S. 266-278 
    Details
    ISSN: 0730-2312
    Keywords: actin ; muscle cells ; differentiation ; cells contacts ; peptide mapping ; posttranslational control ; EDTA ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The expression of vasuclar smooth muscle (VSM) α-actin mRNA during BC3H1 myogenic cell differentiation is specifically stimulated by conditions of high cell density. Non-proteolytic dissociation of cell-cell and cell-matrix contacts in post-confluent cultures of BC3H1 myocytes using EDTA promotes loss of the differentiated morphological phenotype. EDTA-dispersed myocytes exhibit an undifferentiated fibroblastoid appearance and contained reduced levels of both VSM and skeletal α-actin mRNA. Muscle α-actin mRNA levels in EDTA-dispersed myocytes were not restored to that observed in confluent myocyte preparations by experimental manipulation of cell density conditions. Pulse-labeling techniques using L-[35S] cysteine to identify muscle actin biosynthetic intermediates revelated that EDTA-dispersed myocytes expressed nascent forms of both the VSM and skeletal muscle α-actin polypetide chains. However EDTA-dispersed myocytes were less effieicent in the post-translational processing of immautre VSM α-actin compared to non-dispersed myocytes. Simple cell-to-cell contact may mediate VSM α-actin processing efficiency since high-density preparations of EDTA-dispersed myocytes processed more VSM α-actin intermediate than myocytes plated at low density. The actin isoform selectivity of the response to modulation of intercellular contacts suggests that actin biosynthesis in BC3H1 myogenic cells involves mehcanisms capable of discriminating between different isoform classes of nascent actin polypetide chains. © 1992 Wiley-Liss, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240500307
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  • 5
    Electronic Resource
    Electronic Resource
    Proteoglycan biosynthesis is required in BC3H1 myogenic cells for modulation of vascular smooth muscle α-actin gene expression in response to microenvironmental signals (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 164 (1995), S. 172-186 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Induction of vascular smooth muscle (VSM) α-actin mRNA expression during cytodifferentiation of mouse BC3H1 myogenic cells coincides with the accumulation of cell surface- and extracellular matrix-associated sulfated proteoglycans. Inhibition of proteoglycan biosynthesis in myogenic cells using an artificial b̃-D-xyloside glycosaminoglycan acceptor was accompained by a reduction in cell surface/extracellular matrix proteoglycans and VSM α-actin mRNA expression while enhanciang the secretion of free chondroitin sulfate/dermatan sulfate and heparan sulfate glycosaminoglycans into the culture medium. Maximum inhibition of VSM α-actin mRNA expression required that proteoglycan biosynthesis be blocked during the early phase of cytodifferentiation when myoblasts were fully confluent and quiescent. The inhibitory effect of b̃-D-xyloside on α-actin mRNA expression resulted from attenuation at both the transcriptional and post-transcriptional control points. Sustained proteoglycan biosynthesis was required for induction of VSM α-actin mRNA in quiescent myoblasts in response to cytodifferentiation-permissive, substrate-associated macromolecules (SAM) or upon exposure to soluble serum factors capable of transiently stimulating VSM α-actin gene transcription. The results suggested that efficient myoblast cytodifferentiation and modulation of VSM α-actin mRNA levels depended on intact cell surface proteoglycans to convey signals generated as a consequence of cellular interaction with substrate components and serum factors. © 1995 Wiley-Liss, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041640122
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  • 6
    Electronic Resource
    Electronic Resource
    Substrate-associated macromolecules promote cytodifferentiation of BC3H1 myogenic cells (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 146 (1991), S. 337-348 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Differentiated mouse BC3H1 myogenic cells secrete substrate-associated macromolecules (SAM) which restrict the proliferation of undifferentiated cells and promote both cell shape changes and expression of predominantly the vascular smooth muscle (VSM)-specific isoform of the contractile protein α-actin. While we previously reported that high cell density was required for stimulating maximal expression of VSM α-actin in BC3H1 cells (Strauch and Reeser: Journal of Biological Chemistry264:8345-8355, 1989), the permissive effect of SAM on myoblast cytodifferentiation was not at all dependent on the formation of cell to cell contacts. This observation suggests that biogenesis of an extracellular matrix rather than the formation of physical contacts between cells may be the rate-limiting step for induction of VSM α-actin expression at high cell density. The biologically active moieties in SAM that promote cytodifferentiation also are expressed by mouse embryonic fibroblast cell lines and are distinctly different from a class of adheron-like macromolecules released by differentiated BC3H1 myocytes directly into the culture medium. While SAM was cell growth restrictive, reconstituted particulate material (RPM) prepared from myocyte-conditioned medium promoted the adhesion and proliferation of growth-arrested myoblasts. SAM and RPM are composed of different polypeptide subunits which collectively may establish microenvironmental conditions that are permissive for BC3H1 myogenic cell differentiation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041460302
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  • 7
    Electronic Resource
    Electronic Resource
    1,1-Dithiooxalsäurederivate als Liganden in Übergangsmetallkomplexen: Struktur von O-Methyl-1,1-dithiooxalato-bis(triphenylphosphin)kupfer(I) und -silber(I) (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 498-504 
    Details
    ISSN: 0044-2313
    Keywords: Thiooxalates ; 1,1-Dithiooxalate ; 1,1-Dithiooxalic ester ; transition metal complex ; Crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,1-Dithiooxalic Acid Derivatives as Ligands in Transition Metal Complexes: Structure of O-Methyl-1,1-dithiooxalato-bis(triphenylphosphine)copper(I) and silver(I)Despite O-Alkyl-1,1-dithiooxalates are also tetradentate thioligands their tendency towards the formation of multi-nuclear bridged chelates as found for the basic 1,1-dithiooxalate does practically not exist because of derivatisation. The reaction with triphenylposphinemetal(I)-halogenides yields defined mono-nuclear mixed ligand complexes: O-Methyl-1,1-dithiooxalato-bis(triphenylphosphine)copper(I) (2) and silver(I) (1). X-ray analysis shows that both complexes (1 and 2) are isostructural and crystallize in the monoclinic space group P21/n: (Ph3P)2Ag(S2C2O2Me) (1) with a = 12.794(1), b = 21.314(4), c = 13.560(1) Å, β = 97.983(6)°, and (Ph3P)2Cu(S2C2O2Me) (2) with a = 12.622(1), b = 21.196(2), c = 13.426(1) Å, β = 96.533(7)°. These complexes are the first authentic examples of exclusively end-on coordinated thiooxalate.
    Notes: Obwohl potentiell auch vierzähnig, ist die Tendenz von O-Alkyl(bzw. Aryl)-1,1-dithio-oxalaten zur Ausbildung von Brücken in Mehrkern-Chelaten durch die Derivatisierung gegenüber dem Stammliganden 1,1-Dithiooxalat praktisch nicht mehr vorhanden. Durch Umsetzung mit Triphenylphosphinmetall(I)-halogeniden sind definierte einkernige Gemischtligandenkomplexe zugänglich. O-Methyl-1,1-dithiooxalato-bis(triphenylphosphin)kupfer(I) und -silber(I) konnten mittels Röntgenkristallstrukturanalyse strukturell gesichert werden. Beide Komplexe sind isostrukturell und kristallisieren in der monoklinen Raumgruppe P21/n: (Ph3P)2Ag(S2C2O2Me) (1), mit a = 12,794(1), b = 21,314(4), c = 13,560(1) Å, β = 97,983(6)° und (Ph3P)2Cu(S2C2O2Me) (2), mit a = 12,622(1), b = 21,196(2), c = 13,426(1) Å, β = 96,533(7)°. Diese beiden Komplexe sind die ersten strukturell gesicherten Vertreter mit ausschließlich end-on koordiniertem Thiooxalat.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200317
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  • 8
    Electronic Resource
    Electronic Resource
    Überraschende Reaktionen an O-Methyl-1,1-dithiooxalaten (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 505-508 
    Details
    ISSN: 0044-2313
    Keywords: O-methyl-1,1-dithiooxalate ; nucleophilic attack on dithiocarbon ; perthio ligand ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Surprising Reactions on O-Methyl-1,1-dithiooxalatesThe O-methyl-1,1-dithiooxalate ligand (i-dtoMe) reacts with metalII-acetylacetonates of d8 metal centers (NiII, PdII) forming mononuclear mixed ligand complexes with two remarkable aspects: The formation of a perthioligand, first time described for thiooxalates, and the first example of a nucleophilic attack of a CH-acidic compound (acetylacetonate) on dithiocarbon of coordinated dithiocompounds (here i-dtoMe). X-ray structure is shown for Ph4P[(ptoMe)Ni(i-dtoMeacac)].
    Notes: O-Methyl-1,1-dithiooxalat (i-dtoMe) reagiert mit Acetylacetonatkomplexen von d8-Metallen (NiII, PdII) unter Bildung von einkernigen Gemischtligandenkomplexen Ph4P[(ptoMe)M(i-dtoMeacac)] unerwarteter Konstitution. Durch Röntgenkristallstrukturanalyse des NiII-Komplexes konnte erstmals ein nukleophiler Angriff einer CH-aciden Verbindung (Acetylacetonat) am Dithiokohlenstoff einer koordinativ gebundenen Dithioverbindung (i-dtoMe) nachgewiesen werden.Gefunden wurde weiterhin die Entstehung einer Perthiogruppierung, die bisher für Thiooxalate bzw. deren Derivate unbekannt war.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200318
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  • 9
    Electronic Resource
    Electronic Resource
    Neue Gemischtligandenkomplexe mit Perthiocarboxylaten (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1659-1663 
    Details
    ISSN: 0044-2313
    Keywords: O-methyl-1,1-dithiooxalate ; mixed ligand complexes ; perthio carboxylates ; xanthates ; 1,1-dicyanoethene-2,2-dithiolate (i-mnt) ; 1,2-dithiooxalat ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Mixed Ligand Complexes with Perthio CarboxylatesSolutions of O-methyl-1,1-dithiooxalate (i-dtoMe) and metal(II)-chlorides (NiII, PdII) in the molar ratio 2:1 react with equimolar amounts of homonuclear bischelates of other 1,1- and 1,2-dithio-compounds L (L = i-mnt, Etxan, dto) to mixed ligand complexes M(ptoMe)L with spontaneous convertion of the 1,1-dithiooxalate into the corresponding perthio ligand (ptoMe) by sulfur insertion. Tetraphenylphosphonium-(1,1-dicyanoethene-2,2-dithiolato)(O-methyl-1,1 -perthio-oxalato)niccolat(II), Ph4P[Ni(i-mnt)(ptoMe)], crystallizes in the monoclinic space group P21/n with a = 11.019(2) Å, b = 13.648(3) Å, c = 20.882(3) Å, β = 92.565(7)°. The formation of the perthio ligand is confirmed by 13C-NMR.
    Notes: Lösungen von O-Methyl-1,1-dithiooxalat (i-dtoMe) und Metall(II)-chloriden (NiII, PdII) im molaren Verhältnis 2:1 reagieren mit equimolaren Mengen gleichkerniger Bischelate anderer 1,1- und 1,2-Dithioverbindungen L (L = i-mnt, Etxan, dto)Abkürzungen: i-mnt: 1,1-Dicyanoethen-2,2-dithiolat Etxan: Ethylxanthogenat dto: 1,2-Dithiooxalat i-dtoMe: O-Methyl-1,1-dithiooxalat ptoMe: O-Methyl-1,1-perthiooxalat unter Ligandenaustausch zu Gemischtligandenkomplexen M(ptoMe)L bei spontaner Umwandlung des 1,1-Dithiooxalates zum entsprechenden Perthioliganden (ptoMe) durch Schwefelinsertion. Tetraphenylphosphonium (1,1-dicyanoethen-2,2-dithiolato)(O-methyl-1,1-perthiooxalato)niccolat(II), Ph4P[Ni(i-mnt)(ptoMe)], kristallisiert in der monoklinen Raumgruppe P21/n mit a = 11,019(2) Å, b = 13,648(3) Å, c = 20,882(3) Å, β = 92,565(7)°. Die Bildung des Perthioliganden konnte mittels 13C-NMR bestätigt werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200926
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  • 10
    Electronic Resource
    Electronic Resource
    Methyl-perthiooxalate und deren Reaktion mit Ph3P (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 159-164 
    Details
    ISSN: 0044-2313
    Keywords: Perthiooxalate ; mono- and bidentate O-methyl-1,1-dithiooxalate ; EPR ; NiI compound ; mass spectrometry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Methyl-perthiooxalates and their Reaction with Ph3O-Methyl-1,1-dithiooxalate reacts with d8 transition metal ions with the spontaneous formation of mononuclear perthio/dithiooxalate complexes [(i-dtoMe)M(ptoMe)] (M = Ni, Pd, Pt). The mass spectrometric fragmentation of this complexes is discussed. The spontaneous sulfur insertion can be reversed by reaction with Ph3P. Following up reactions with different Ph3P equivalents are investigated for the NiII compound. Beside the synthesis of the square planar mixed ligand complex [(Ph3P)Ni(i-dtoMe)2] a NiI complex was detected by EPR spectroscopy.
    Notes: O-Methyl-1,1-dithiooxalat (i-dtoMe) reagiert mit d8 Übergangsmetallionen spontan zu Perthio-/Dithiooxalat-Einkernkomplexen [(i-dtoMe)M(ptoMe)] (M = Ni, Pd, Pt). Die massenspektrometrische Fragmentierung dieser Komplexe wird diskutiert. Durch Umsetzung mit Ph3P ist es möglich, die spontane Schwefelinsertion umzukehren. Für die NiII-Verbindung wurden Folgereaktionen mit verschiedenen Äquivalenten Ph3P untersucht, wobei neben der Synthese des quadratisch planaren Gemischtliganden-Komplexes [(Ph3P)Ni(i-dtoMe)2] der EPR-spektroskopische Nachweis eines NiI Komplexes gelang.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210129
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