Elektrochemische Synthese von Kupfernitrilkomplexen

Electrochemical Synthesis of Copper Nitrile Complexes Electrochemical syntheses of copper nitrile complexes by anodic dissolution of copper and cathodic reduction of malonodinitrile in a one‐step reaction are reported. In the presence of different donors the following compounds are obtained and characterized analytically: {[Cu₂(μ‐CN) · (CH₃CN)₃]CH(CN)₂}_n ( 1 ), {[Cu₂(μ‐CN)(PPh₃)₄]CH(CN)₂}_n ( 2 ) and [Cu₂(μ‐CN)(phen)₂(PPh₃)₂]CH(CN)₂ ( 3 ). As a result of an X‐ray analysis, 3 proved to be an ionic binuclear complex in which the cyano‐bridged Cu^I atoms have distorted tetrahedral coordination sphere. Both the CN group and the dicyanomethanid anion are disordered about centres of inversion.     

Synthese von bis(fluorosilyl)anilinen

Fluorosilanes react with $\text{N}$-lithio-2,4,6-trimethyl-aniline with LiF elimination and substitution. Lithium salts are obtained by the reaction of N-(fluoro-diorganylsilyl)-2,4,6-trimethylanilines with butyllithium. Further reactions of these lithium salts with fluorosilanes gives bis(fluorosilyl)-anilines. The ¹⁹F NMR spectra of the N-(fluorosilyl)-N-(di-fluorosilyl)anilines with chiral silicon and bulky substituents show AB systems for the SiF₂ groups. Analyses for C and H, NMR and mass spectra are reported for all compounds.     

Thermische untersuchung von pyridinring enthaltenden metallkomplexen

The thermal behaviour of the dipyridyl and rhodanide, resp. isoquinoline and rhodanide complexes of cobalt and nickel has been studied and the course of their thermal decomposition is cleared up.     

Aminyloxide (nitroxide)-XXVI: ESR-spektroskopische untersuchung von hydrazonyloxiden. Ermittlung der spindichteverteilung

The so-called “Bergmann oxide” 4a and the related compounds 4b-i dissociate reversibly to the corresponding radicals 5 at elevated temperatures. Analysis of the ESR spectra reveals that in 5a-f the unpaired electron is delocalized over the entire molecule. On the other hand the strongly reduced spin density at the β-carbon atom in 5h-i as well as in 7 indicates a twisting about the N,N-bond in these radicals, whereas m 5g the bond between the β-carbon atom and the group Ar¹ is twisted. The results of spin density calculations for radicals 5 are in agreement with the experimentally estimated spin densities. In spin trap experiments with nitrosobenzene or nitrones respectively, 5a reacts at the β-carbon atom, indicating this position as the most reactive one.     

Die organoborierung von bis(trimethylstannyl)acetylen

The cis-addition of trialkylboranes at room temperature to bis(trimethylstannyl)acetylene, yielding products of high synthetic potential, is reported.     

Photoelektronenspektroskopische untersuchung von tris(trimethylelement(IV)aminen, -phosphinen, -arsinen und -stibinen

The PE spectra of [(CH₃)₃Sn]₃N, [(CH₃)₃E]₃P (E = C, Si, Sn), [(CH₃)₃Si]₃As and [(CH₃)₃E]₃Sb (E = C, S, Ge, Sn) are analyzed. The constant level of the ionization potentials of the n-hybrid orbitals of N, P, As, and Sb, together with changes in the hybridization and interactions with ligand MO's is discussed by qualitative MO investigations.     

Thermoanalytische untersuchung von sekundärem calciumphosphatdihydrat

The thermal excitation of artificial brushite in dried air and normal atmosphere generates the following reactions:

We could not register the monotropic γ→β and β→χ transformations by DTA. At low p_H2O values unstable inordinate intermediates are formed until the exothermic transformation, at high p_H2O value and in water a stable, secondary hydrogen phosphate of ordinate crystal lattice and γ-pyrophosphate originate. The amorphous intermediate compounds are pseudomorphous with the initial brushite. The lack of H₂O hinders, whereas the excess of H₂O promotes the formation of nuclei and crystallization of monetite and as a result of this its thermal existence region is expanded. Accordingly, during the dehydratation process in dry air the decrease of the     

Elektrochemische Dimerisierung von Butadien in Gegenwart von Kobaltsystemen

The cathodic reduction of cobalt salts in presence of butadiene gives linear oligomers. The oligomerisation is probably independent of the nature of the reducing agent. The presence of phosphines and phosphites in electrolysis of cobalt-tris-acetylacetonate/butadiene mixtures mostly prevent linear dimerisation of butadiene.     

Elektrochemische Polymerisation von Acenaphthylen in Nitrobenzol

Ohne Zusammenfassung     

Elektrochemische Polymerisation von Acenaphthylen in Nitrobenzol

Ohne Zusammenfassung     

Elektrochemische Reduktion von Wasser und seinen Ionen

Ohne Zusammenfassung