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  • 1
    Digitale Medien
    Digitale Medien
    Silberkomplexe von 3-disubstituierten 1-Methyl-perhydro-1,2,4-triazin-5,6-dithionen (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 53-57 
    Details
    ISSN: 0941-1216
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Silver(I) Complexes of 3-Substituted 1-Methyl-perhydro-1,2,4-triazine-5,6-dithionesHeterocyclic triazine compounds such as 1-methyl-perhydro-1,2,4-triazin-5,6-dithiones react with silver salts forming complex species [AgL2]+ (L = triazinedithione). In water the complexes are unstable owing to ligand hydrolysis. Stable solid complex [AgL2]Br(L = 1,3,3-trimethyl-perhydro-1,2,4-triazine-5,6-dithione) can be obtained by the digestion of AgBr-microcrystals with the triazinedithione in methanol. As shown by X-ray crystal structure analysis the silver ion in this complex is coordinated trigonal pyramidal by four sulfur donor atoms.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19943360110
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  • 2
    Digitale Medien
    Digitale Medien
    Structure of monomeric 1-aryl-2-nitroso-prop-1-enes (1995)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 686-687 
    Details
    ISSN: 0941-1216
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.199533701144
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  • 3
    Digitale Medien
    Digitale Medien
    On the Mechanism of n-Butyl Vinyl Sulfide Formation with [K(18-crown-6)SBu] as catalyst (1996)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 264-269 
    Details
    ISSN: 0941-1216
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: n-Butyl mercaptane reacts with acetylene in the presence of [K(18-cr-6)SBu] as catalyst to give n-butyl vinyl sulfide. In toluene the reaction is of zeroth order with respect to BuSH and first order with respect to [K(18-cr-6)SBu]. The reaction rate depends on the solvent in the following order: toluene 〉 triglyme ≈ BuSH ≈ dioxane ≫ BuOH. In toluene, BuOH added in equimolar amounts accelerates the reaction indicating a complex formation [K(18-cr-6) (BuOH)SBu] with a higher catalytic activity. [K(18-cr-6)SBu] is monomeric in the solid state with d(K-S) = 3.051(2) Å. Potassium is displaced out of the mean plane defined by the six oxygen atoms of the crown ether by 0.626(3) Å. [K(18-cr-6)SBu] is a strong electrolyte in alcohols but practically no electrolytic dissociation takes place in solvents with low dielectric constants such as toluene and n-butyl mercaptane. From the results a reaction mechanism is derived with the addition of non-dissociated [K(18-cr-6)SBu] to acetylene as the rate-determining step.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19963380152
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  • 4
    Digitale Medien
    Digitale Medien
    CO2-Aktivierung an Übergangsmetallzentren: Simulation enzymatischer CO2-Fixierungs- und Transferreaktionen durch elektronenreiche (Diazadien)magnesium- und -mangan-Komplexe (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1529-1536 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Carbon dioxide fixation ; Metal complexes ; Diazadiene ligands ; Carboxylation ; Enzyme models ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Activation of CO2 at Transition-Metal Centres: Simulation of Enzymatic CO2 Fixation and Transfer Reactions by Electron-Rich (Diazadiene)magnesium and -manganese ComplexesElectron-rich diazadiene complexes of Mg and Mn can be used as model compounds for enzymatic carboxylation reactions e.g. the „dark reaction“ of the photosynthesis or in biotinedependent CO2 conversion reactions. The activity of the complexes to fix and transfer carbon dioxide strongly depends on the nature of the metal (Mg and Mn are active central atoms, other transition metals are inactive), the π aciditiy of the chelate ligand, and the structure of the complexes. The dimeric manganese complex IIa, the structure of which could be determined by X-ray structure analysis, is one of the most active compounds. NMR studies reveal that the CO2 transfer to substrates with active C - H bonds takes place in the coordination sphere of the metal atom. Carrier of activated CO2 is the N - COO group.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19921250703
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  • 5
    Digitale Medien
    Digitale Medien
    Metallorganische CO2-Speichersysteme aus Nickel(0)-1-azadieneinheiten und ihre Reaktivität bei der Carboxylierung von Acetophenon (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 281-287 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Carbon dioxide fixation ; 1-Azadiene ligands ; Nickel(0) complexes ; Carboxylation ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Organometallic CO2 Reservoires from Nickel(0)-1-Azadiene-Type Ligands and Their Reactivity in the Carboxylation of Acetophenone1-Azadiene-type ligands yield with nickel(0) binuclear organometallic compounds of the type [Ni(1-azadiene)n,]2 (n = 1, 2). The structures of the complexes 1 (n = 2, ligand A) and 3 (n = 1, ligand C) have been characterized by X-ray crystallography. 1 is unreactive towards CO2, 3 and similar compounds are able to react with CO2 to give metallacyclic carbamato complexes of Ni(II). In these compounds CO2 is activated and can carboxylate acetophenone to yield benzoylic acid upon protolysis. These reactions mimic biologic conversion reactions of CO2 into organic material by organometallics. - The addition of two moles of the (bpy)Ni(0)-fragment [from (bpy)Ni(COD)] to 3 gives the tetranuclear complex 6. The X-ray analysis of the monomeric model compound (bi-py)Ni(A) (11) shows that only the olefin part is coordinated. 6 and 11 can also react with CO2. Cu(I) complexes with 1-azadiene-type ligands are not reactive towards CO2.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19951280312
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  • 6
    Digitale Medien
    Digitale Medien
    Polymorphie an chiralen phosphoranalogen Asparaginsäure-Derivaten: Kristall- und Molekülstruktur von 2-(Benzoylamino)-3-(diethoxyphosphoryl)-3-(4-methoxyphenyl)propionsäure-methylester (1991)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1991 (1991), S. 1171-1175 
    Details
    ISSN: 0170-2041
    Schlagwort(e): Aspartic acid, β-(diethoxyphosphoryl), derivatives ; Hydrogen bonds ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Polymorphy on Chiral Phosphorus Analogues of Aspartic Acid Derivatives: Crystal and Molecular Structure of Methyl 2-(Benzoylamino)-3-(diethoxyphosphoryl)-3-(4-methoxyphenyl)propionateThe diastereomers of the title compound 1 were characterized by X-ray structure analyses. The relative configuration of diastereomer A is determined as RS/SR, diastereomer B shows RR/SS configuration. Depending on the different configurations hydrogen bonds are formed by the phosphoryl oxygen with the amide hydrogen intermolecularly (form A) or intramolecularly (B). No interaction is observed of the carboxylate and the amide oxygen, respectively, with the amide hydrogen.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.1991199101201
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