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1978 (1)
1977 (1)
1Author    J.Requires cookie*
 Title    Electronic Structure of Pseudotetrahedral Copper(II) Schiff Base Complexes  
 Abstract    W a s s o n , H . W a y n e R i c h a r d s o n , a n d W i l l i a m E . H a t f i e l d Copper(II) complexes with the Schiff bases formed by condensing i-butyl-, isopropyl-, cyclohexyl-and diphenylmethylamines with salicylaldehyde and 3-methoxy-and 5-nitro-salicyl -aldehyde have been prepared and characterized. The isotropic nuclear hyperfine coup -ling constants increase in the order t-butyl < isopropyl < cyclohexyl < diphenylmethyl for the N-substituents in the three series of complexes while isotropic g-values increased in the opposite direction. Spectra structure correlations were examined and discussed. 
  Reference    (Z. Naturforsch. 32b, 551—561 [1977]; received December 2 1976/February 12 1977) 
  Published    1977 
  Keywords    Copper(II) Complexes, Electron Paramagnetic Resonance, Schiff Base Complexes, Electronic Spectroscopy, Hyperfine Coupling Constants 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0551.pdf 
 Identifier    ZNB-1977-32b-0551 
 Volume    32 
2Author    Hans-Ulrich Meisch, Heinz Hoffmann, Wolfgang ReinleRequires cookie*
 Title    Vanadium Catalysis in the Nonenzymatic Transamination of 8-Aminolevulinic Acid  
 Abstract    By nonenzymatic model reactions, the influence o f vanadium (V 0 2+, V 0 3~) and other metal ions (A l3+, F e2+, F e3+, Zn2+, N i2+, Cr3+) on the transamination of 4,5-dioxovaleric acid (D O V A) with L-alanine (A la) to 6 -aminolevulinic acid (<5-ALA) and pyruvic acid (P A) with pyridoxal phosphate (P L P) is investigated. The examinations o f the partial reactions show that V 0 2+, V 0 3~ and F e2+ effectively enhance both conversions, while N i2+ only promotes the conversion of D O V A to 6 -A L A with pyridoxamine phosphate (P M P) . Besides Cr3+ , which inhibits the transaminations, all other metals tried slightly enhance both reactions. The coupled transamination D O VA/A la to (5-ALA/PA with P L P as a catalyst is performed at 40 °C , the extent of the reaction being judged by the amount o f 6 -A L A formed. Am ong all metal ions tested, V 0 2+ and V 0 3~ were found to be the most effective ones. Fe2+, A l 3+ and Fe3+ also slightly enhance the reaction, but all other metals do not influence or inhibit the transamination. In presence of V 0 2+ or V O 3-ions, the optimum pH of the reaction shifts from pH 4 to pH 7.4. The positive influence of vanadium on <5-ALA trans­ amination is discussed in connection with known structures of analogous Schiff base complexes with metal ions. 
  Reference    Z. Naturforsch. 33c, 623 (1978); received March 21 1978 
  Published    1978 
  Keywords    Vanadium, (5-Aminolevulinic Acid, 45-Dioxovaleric Acid, Transamination, Pyridoxal Phosphate, Schiff Base Complexes 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0623.pdf 
 Identifier    ZNC-1978-33c-0623 
 Volume    33