CCMP, 2-chloro-5-(chloromethyl)pyridine, is a building block used in selected neonicotinoid routes. To assess a proposed DMSO application, first identify what happens to its chloromethyl group.
Two transformations, different products
In substitution, a nucleophile replaces the leaving group on the chloromethyl side chain and forms a new bond. In Kornblum oxidation, a suitable alkyl electrophile is converted into a carbonyl compound using DMSO. Applied to a suitable chloromethyl substrate, the intended product would be an aldehyde.
These routes lead to different intermediates. The presence of CCMP in a purchasing list does not establish which transformation a plant performs or whether it uses DMSO.
What a useful process description includes
Specify the starting intermediate, intended product, nucleophile or oxidation system, and DMSO's role. For a proposed substitution, monitor the desired product and possible competing oxidation. For an oxidation, establish the actual substrate evidence and impurity profile.
Water, assay and relevant solvent impurities should follow that defined reaction. Work-up, recovery and mixture compatibility also need evaluation before a solvent source is changed.
This is a route-selection guide. It does not establish DMSO as a verified solvent for manufacturing CCMP itself. A supply enquiry should identify the exact DMSO-containing step.