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'Cyclocondensation' in keywords Facet   section ZfN Section B  [X]
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1996 (1)
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1Author    Wolf-H Gündel, Helmut BerenboldRequires cookie*
 Title    Reaktionen von Isochinolinium-Salzen mit Alkoholaten Reactions between Isoquinolinium Salts and Aleoxides  
 Abstract    Quaternary isoquinolinium salts react with an equivalent amount of anionic bases to a cyclocondensate (3), which has lipophilic properties. Other carboxamides insert after deprotonation by potassium ter^-butoxide the isoquinolinium ring, too. The resulting product 5 is stable. Aluminium-triisopropoxide can reduce substituted isoquinolinium salts. 3 and 5 react with 2-propanol and ZnCl2 to give first a solution of isoquinolinium iso-propoxide and then in a redoxreaction the corresponding 1,2-dihydroisoquinoline. That are modelreactions for the enzymatically catalyzed alcoholoxidation by the coenzyme NAD+. 
  Reference    Z. Naturforsch. 34b, 1593—1599 (1979); eingegangen am 10. Juli 1979 
  Published    1979 
  Keywords    Isoquinolinium Salts, Cyclocondensation, Redoxreaction 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1593.pdf 
 Identifier    ZNB-1979-34b-1593 
 Volume    34 
2Author    Alfred Schm, Stefan Planka, Kurt PolbornbRequires cookie*
 Title    2-YIidvl-l,3,2-oxathiaphosphole und -oxaselenaphosphole 2-Ylidyl-l,3,2-oxathiaphospholes and -oxaselenaphospholes  
 Abstract    Ylidyl thioxophosphines or selenoxophosphines and phenacyl halides undergo addition in a 1:1 ratio and yield in the presence of triethylamine the title compounds. The molecular structure of an ylidyl oxathiaphosphole demonstrates a strong interaction between the ylid substituent and the heterocycle, making the exocyclic PC-bond unusually short and the end-ocyclic PO-and PS-bonds considerably longer than normal for a pyramidal phosphorus atom. The ylidyl chalcogenoxophosphines are oxidized by sulfur or selenium at the phosphorus atom and protonated at the ylidic carbon atom. N o Wittig-type reaction is observed. Ein Ylidyl-thioxo-und -selenoxophosphan (Thioxo-und Selenoxophosphanyl-ylid) 1,2 [1,2] 
  Reference    Z. Naturforsch. 50b, 1543—1549 (1995); eingegangen am 10. Mai 1995 
  Published    1995 
  Keywords    Phosphino-Ylides, Thioxo-and Selenoxophosphanes, Cyclocondensation, Phosphorus Heterocycles, N egative Hyperconjugation 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1543.pdf 
 Identifier    ZNB-1995-50b-1543 
 Volume    50 
3Author    Phosphonio-Substituted Tetrahydro-, -Diphosphinines, -Azaphosphinines, Georg Jochem, Martin Schm, HeinrichN. Öth ', Alfred SchmidpeterRequires cookie*
 Title    Phosphonio-substituierte Tetrahydro-l,3-diphosphinine un(j Tetrahy dro-1,2,6-azad i phospli in i ne  
 Abstract    The bis(triphenylphosphonio)propenide cation 1 provides two reactive CH sites in 1,3-position and can be condensed with the bis(dichlorophosphanyl)methylene triphenylphos-phorane 2 or the bis(dichlorophosphanyl)aniline 3 to form cationic six-membered rings: A tetrahydro-1,3-diphosphinine (4) with three phosphonio or phosphoranediyl substituents in 2,4,6-position and a tetrahydro-1,2,6-azadiphosphinine (5) carrying two such substituents in 3,5-position. The bromide of the latter was used for an X-ray structure analysis. The P111 ring members of the cations 4 and 5 can be oxidized in two steps by elemental sulfur to give the monothioxo and dithioxo derivatives 6. 7 and 8, 9. respectively. A crystal of the mixed chloride/bromide of 8 was used for another X-ray structure analysis. 
  Reference    Z. Naturforsch. 51b, 1761—1767 (1996); eingegangen am 16. August 1996 
  Published    1996 
  Keywords    Dichlorophosphanyl Ylides and Amines, Cyclocondensation, Phosphorus Heterocycles, 1, 3-Diphosphinines, 1, 2, 6-Azadiphosphinines 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1761.pdf 
 Identifier    ZNB-1996-51b-1761 
 Volume    51