Product Details of 20859-23-8. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: (S)-2-Bromosuccinic acid, is researched, Molecular C4H5BrO4, CAS is 20859-23-8, about Simple syntheses of malathion and malaoxon enantiomers, and isomalathion diastereoisomers: toxicity-configuration relationship. Author is Polec, Iwona; Cieslak, Ludwika; Sledzinski, Bohdan; Ksycinska, Hanna.
Malathion enantiomers were synthesized by nucleophilic substitution of the O,O-di-Me dithiophosphoryl anion to di-Et (R)- or (S)-2-bromosuccinate. Malaoxon enantiomers were obtained from optically active malathions in thiono-thiolo rearrangement with 65% HNO3. Desmethylation of malathion enantiomers by triethylamine, following the remethylation using Me iodide gave isomalathion diastereomeric pairs. Physicochem. characteristics of the compounds obtained, and their influence on rats and some species of arthropods, are presented.
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Reference:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”