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1985 (1)
1Author    Manfred Regitz, Klaus Urgast, Gerhard MaasRequires cookie*
 Title    Phosphorverbindungen ungewöhnlicher Koordination, 3 [1] Vergleich des Cycloadditonsverhaltens von Diphenylketen und Triphenylphosphen Phosphorus Compounds with Unusual Coordination, 3 [1] Comparison of the Cycloaddition Behaviour of Diphenylketene and Triphenylphosphene  
 Abstract    Triphenylphosphene (3b), generated thermally or photochemically from lb, undergoes olefi-nation reaction with 4.5-benzotropone (6) to yield l-(diphenylmethylen)-4.5-benzocyclohepta-triene (9); the oxaphosphetane 7b is assumed to be the intermediate of this reaction. In an analogous way, 4-pyrone (15) is transformed into 4-(diphenylmethylen)pyrane (16). Correspon-ding olefination behaviour is observed in the reactions of 6 and 15 with diphenylketene. In the reaction of tetracyclone (20) with diphenylketene (3a), the olefination sequence leads to the formation of (diphenylmethylen)tetraphenylcyclopentadiene (21) via betain 22a and the cycloadduct 23a. The spirocyclic reaction product 26a probably arises from the same betain — like intermediate (22 a —> 25 a —> 26 a). The analogy in triphenylphosphene reactivity towards 20 is restricted to the [2+8]-cycloaddition step (formation of 26b). 
  Reference    (Z. Naturforsch. 40b, 67—76 [1985]; eingegangen am 19. Juli 1984) 
  Published    1985 
  Keywords    Diphenylketene, Triphenylphosphene, Cycloaddition with CO-Compounds, Crystal Structure 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0067.pdf 
 Identifier    ZNB-1985-40b-0067 
 Volume    40