DMSO is used in documented aryl-ether-forming steps associated with acifluorfen production. It provides the reaction medium while an oxygen nucleophile and an activated aromatic component form the ether linkage.
The ether-forming operation
One disclosed route reacts a hydroxybenzoic acid component with a chlorinated trifluoromethyl aromatic compound in DMSO. The patent discusses positional impurities and subsequent purification of acifluorfen.
A separate preparation also includes a DMSO example while listing other solvent choices. Together, these disclosures support a specific application, rather than one common route for all diphenyl ether herbicides.
Follow selectivity through purification
Measure conversion and positional impurities, then assess how the product is isolated and purified. Base, water, salt behavior and solvent composition can affect the practical outcome.
When comparing fresh and recovered DMSO, examine the relevant impurity profile and product quality. Recovery, wastewater and isolation should be included when assessing a solvent change.
For sourcing, share the specification for the actual ether-forming step with YUJI.