Optisch aktives N-(1'-Methyl-2'-methoxyäthyl)-N-chloracetyl-2-äthyl-6-methylanilin als Herbizid
申请人:CIBA-GEIGY AG
公开号:EP0077755A2
公开(公告)日:1983-04-27
Das optisch aktive Isomerengemisch aRS,1'S(-)-N-(1'-Methyl-2'-methoxyäthyl)-M-chloracetyl-2-äthyl-6-methylanilin besitzt gegen Problemunkräuter eine verbesserte Wirkung als das racemische Isomerengemisch, welches unter dem Trivialnamen "Metolachlor" bekannt ist.
The acid hydrolytic cleavage of 1 to 2, assisted by a neighbouring benzamide group, was kinetically investigated in a wide range of HCl concentrations (1.67–8.7 M) and at various temperatures. Kinetic measurements were performed also in the presence of LiCl at constant ionic strength (I = 5 M). The rate determining step of the acid hydrolysis of 1 was recognized through the investigation of the acid catalyzed cyclization of 3 to 2. Thermodynamic activation parameters were calculated and the experimental data discussed. The participation of the neighbouring benzamide group was evaluated to be about 7.3 × 103.