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1997 (1)
1991 (1)
1Author    FerencD. UtkaRequires cookie*
 Title    Bioactive Chemical Bond Systems in Safeners and Prosafeners  
 Abstract    Acetals and ketals involving a dichloromethyl group on their central carbon atom were found to be active or highly active as safeners of corn against thiocarbamate and chloroacet-anilide herbicide injury. A mechanism for the biotransformation of these compounds as pro­ safeners to the actual dichloroacetic ester safeners is proposed. Similarly, S-and N-analogues of the cyclic acetals (ketals) which show safener activity can also be considered as prosafeners because they can be converted in the biophase by the same mechanism into actual safeners such as dichloroacetic thiolesters or dichloroacetamides sup­ porting the bioactivation hypothesis. Characteristic bioactive chemical bond systems in safeners and prosafeners are suggested. 
  Reference    Z. Naturforsch. 46c, 805 (1991); received March 26 1991 
  Published    1991 
  Keywords    Safeners, Prosafeners, Acetals, Ketals, MG-191 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0805.pdf 
 Identifier    ZNC-1991-46c-0805 
 Volume    46 
2Author    H. Möhrle, M. JeandréeRequires cookie*
 Title    ,3-Dioxolane von N-substituierten 4-Piperidonen als Dehydrierungssubstrat 1,3-Dioxolanes of N-Substituted 4-Piperidones as Substrates for Dehydrogenations  
 Abstract    The applicability of ketals was examined for masking the carbonyl group in N-tertiary 4-piperidones during the dehydrogenation using mercury-edta. Various 1,3-dioxolanes showed a different behaviour in dependence on the N-substituent. With simple aliphatic moieties mainly dehydrogenated but hydrolyzed products were received. These enaminones were also available from the dehydrogenations of the corresponding 4-piperidones. Similar applied to para-acyl-aromatic substituted derivatives but with less yields. Aromatic substituents bearing a neighbour group on ortho-position with participation gave rise to different oxidation products partially with preservation of the ketal structure. 
  Reference    (Z. Naturforsch. 52b, 72—78 [1997]; eingegangen am 23. August 1996) 
  Published    1997 
  Keywords    Ketals, Enaminones, N, 0-A cetals, Lactams, Dehydrogenation with Hg-EDTA Complex 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0072.pdf 
 Identifier    ZNB-1997-52b-0072 
 Volume    52