DMSO is used as an oxidation reagent in documented routes to emamectin-related intermediates. In one disclosed process, protected avermectin material is treated using DMSO, phenyl dichlorophosphate and a base.
An activated-DMSO step
The activation system allows DMSO to participate in oxidation of the selected intermediate. Other solvents are also used in the disclosed process, so DMSO should be counted as a reagent separately from the bulk reaction medium.
Avermectin-derived substrates have several functional groups. Protection strategy and the specific oxidation site determine which transformation is intended and which impurities need to be followed.
From reaction to isolated intermediate
Compare conversion, oxidation selectivity and impurities through work-up. Mixing, addition sequence and heat removal should follow the established procedure and equipment assessment.
Specify the DMSO assay and water limit required by the activation system. If recovered material is proposed, evaluate impurities that could affect activation or product quality. Downstream solvent and by-product removal belong in the process comparison.
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