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1991 (1)
1Author    Zsigmond Ekler, FerencD. UtkaRequires cookie*
 Title    Chemical Reactivity and Safener Activity of Acetal Compounds  
 Abstract    Although detailed examinations have been published on structure-activity relationships of herbicide safeners, only a few data are available on chemical reactivity-safener activity rela­ tionships. Chemical reactivity o f acetamide type compounds as well as their safener activity against thiocarbamate herbicides change with the number o f chlorine substituents in the order: non-chlorinated < monochloro < dichloro. Several compounds of another chemical group, acetals (e.g. MG-191, 2-dichloromethyl-2-methyl-l,3-dioxolane), are also effective safeners for thiocarbamate herbicides. According to our growth room studies, the safener activity o f ace­ tals also increases with increasing chlorine content up to two chlorine atoms on the same car­ bon. A number of differently chlorinated acetals have been synthesized and their acid-cata­ lyzed hydrolysis rate determined in order to establish a relationship between their bioactivity and chemical reactivity. The hydrolysis rate order of acetals containing no, one or two chlorine atoms: non-chlorinated > monochloro > dichloro, is just the opposite than what has been found for acetamides. Thus, safener activity of acetals increases with decreasing chemical reac­ tivity. The opposite reactivity order of acetamides and acetals can be explained by the different mechanisms of their hydrolysis. Dichloroacetals may not be effective safeners in their original structure. In plants, however, they can be biologically activated to active safeners by a trans­ formation other than hydrolysis. 
  Reference    Z. Naturforsch. 46c, 810—814 (1991); received March 26 1991 
  Published    1991 
  Keywords    Acetals, Hydrolysis, Herbicides, Herbicide Safeners, Zea mays (L) 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0810.pdf 
 Identifier    ZNC-1991-46c-0810 
 Volume    46