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'Quinones' in keywords Facet   section ZfN Section B  [X]
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1999 (1)
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1992 (1)
1Author    Uwe Kuckländer, KrystinaK. Una, Gabriele Zerta, Wolfgang PollRequires cookie*
 Title    Untersuchung zur 6 -Hydroxyindol-Bildung bei der Nenitzescu-Reaktion, IV [1] Cyclisierung von N-(Chinonylalkyl)enaminon-Derivaten, II [2] Investigation on the F orm ation of 6 -F[ydroxyindole in the Nenitzescu Reaction, IV [1] Cyclization of N-(Quinonylalkyl)enam inone Derivatives, II [2]  
 Abstract    Quinonylmethylenaminones 5 and 6 are synthesized and cyclized to spiro com pounds 7 and 8. Quinonylpropylenaminone 15 is made in the same way. Cyclization in acetic acid yields qui-nolines 11 and 12, in trifluoroacetic acid/trifluoroacetic anhydrid diacylenamine 16 is ob­ tained. The product o f 15 in perchloric acid is benzazocine 20. The structure o f 20 is proven by X-ray analysis. The course o f the reaction is discussed. 
  Reference    Z. Naturforsch. 47b, 1403—1410 (1992); eingegangen am 17. April 1992 
  Published    1992 
  Keywords    Spirocyclization, Quinones, Enaminones, Benzofurano-azocin, Crystal Structure 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1403.pdf 
 Identifier    ZNB-1992-47b-1403 
 Volume    47 
2Author    Steffen Runge, M. Athias, O. SengeRequires cookie*
 Title    Electron Donor-Acceptor Compounds. Synthesis and Structure of 5-(l,4-Benzoquinone-2-yl)-10,15,20-trialkylporphyrins  
 Abstract    A series of 5-(benzoquinone)-10,15,20-trialkylporphyrins was synthesized via cross conden­ sation of the respective aldehydes, 2,5-dimethoxybenzaldehyde and pyrrole followed by de-methylation with BBr3 and oxidation with P b 0 2. This method worked reasonably well for compounds bearing the benzoquinone substituent and butyl, isopropyl, 1 -methylpropyl and 2-ethylpropyl residues (2a-d). The free base porphyrin quinones were converted into the zinc(II) complexes (3a-d) all of which showed remarkable stability for porphyrin quinones. The zinc(II) complex 3c bearing isopropyl residues was investigated by X-ray crystallography and showed a supramolecular structure consisting of polymeric chains facilitated by coordina­ tion of a benzoquinone oxygen to a neighboring zinc(II) center. Attempts to synthesize a 5-(benzoquinone)-10,15,20-tris(terr-butylporphyrin) resulted in the formation of a yellow por-phomethene (4), which could not be oxidized further. A crystal structure analysis of 4, the first for a free base porphomethene, shows an extremely twisted conformation with syn-orientation of the three rm-butyl groups. The results indicate that new methods will have to be developed for the synthesis of nonplanar porphyrin quinones. 
  Reference    Z. Naturforsch. 53b, 1021—1030 (1998); received June 15 1998 
  Published    1998 
  Keywords    Porphyrins, Quinones, Electron Transfer Compounds, Crystal Structure, Conformation 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1021.pdf 
 Identifier    ZNB-1998-53b-1021 
 Volume    53 
3Author    Markus Leirer, Günther Knör, Amd VoglerRequires cookie*
 Title    Synthesis and Electronic Spectra of Tricarbonylrhenium(I) Chloride Complexes with 9,10-Phenanthrenequinone and 9,10-Phenanthrenequinone Diimine as Acceptor Ligands  
 Abstract    The complexes Re(L-L)(CO)3Cl with L-L = 9,10-phenanthrenequinone (PHQ) and 9,10-phenanthrenequinone diimine (PHI) were prepared and characterized spectroscopically. Both compounds show intense Re(I) to L-L metal-to-ligand charge transfer (MLCT) absorptions. In chloroform, the M LCT bands appear at 711 nm (L-L = PHQ) and 553 nm (L-L = PHI). 
  Reference    Z. Naturforsch. 54b, 1039—1041 (1999); received April 28 1999 
  Published    1999 
  Keywords    Charge Separation, Rhenium Complexes, Quinones, Diimines 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1039.pdf 
 Identifier    ZNB-1999-54b-1039 
 Volume    54