Fluorine analogs of dicamba and tricamba herbicides; Synthesis and their pesticidal activity
Fluorine analogs of the dicamba and tricamba herbicides were synthesized. Their herbicide activities were compared with the activities of the pattern herbicides dicamba and tricamba.
Huras, Bogumi?a,Zakrzewski, Jerzy,Zelechowski, Krzysztof,Kie?czewska, Anna,Krawczyk, Maria,Hupko, Jaros?aw,Jaszczuk, Katarzyna
p. 181 - 192
(2021/02/27)
REACTION OF AROMATIC COMPOUNDS WITH NUCLEOPHILIC REAGENTS IN LIQUID AMMONIA IV.* THE NUCLEOPHILIC AND PROTOPHILIC ACTIVITY OF METHOXIDE AND HYDROXIDE IONS IN REACTIONS WITH POLYFLUORINATED AROMATIC COMPOUNDS
In the reaction of polyfluorinated derivatives of benzene with potassium methoxide in liquid ammonia a fluorine atom is substituted by a methoxy group.With potassium hydroxide reactions involving removal of a proton from a ring carbon atom take place preferentially.The possibility of polyfluoroarylation and methylation catalyzed by potassium hydroxide in polyfluorinated aromatic compounds, based on capture of the polyflurinated aryl anion by the electrophile, was demonstrated.
Shtark, A. A.,Chuikova, T. V.,Shteingarts, V. D.
p. 960 - 967
(2007/10/02)
Mechanisms for Reactions of Halogenated Compounds. Part 3. Variation in Activating Influence of Halogen Substituents in Nucleophilic Aromatic Substitution
Rate constants are reported for reactions of polyhalogeno-pyridines and -benzenes with sodium methoxide in methanol.Relative activating effects of individual fluorine and chlorine atoms at positions ortho, meta, and para to the reaction site are determined and compared with orders determined from reactions involving ammonia in aqueous dioxan.The results are remarkably similar.Additional support is provided for earlier explanations of the activating effects of ortho-fluorine and -chlorine.Activation parameters, determined for reactions of polyhalogenepyridines with ammonia in aqueous dioxan, clearly demonstrate that differences in reactivity along the series arise mainly from changes in activation energy.
Chambers, Richard D.,Close, Deborah
p. 778 - 780
(2007/10/02)
Polyfluorinated Radical Cations
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Chambers, Richard D.,Sargent, Colin R.,Silvester Michael J.,Drakesmith, Frederick G.
p. 257 - 262
(2007/10/02)
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