DMSO can function as a solvent in selected palladium-catalyzed reactions and can also coordinate to the metal. That coordination makes it part of the chemical environment around the catalyst.
Solvent and coordination roles
A published coupling study uses a defined palladium complex containing a DMSO ligand. This is a specific catalyst example; a DMSO ligand in a complex does not by itself mean the reaction uses bulk DMSO as its solvent.
Other research shows that solvent coordination can change oxidative-addition selectivity. For a proposed reaction, identify whether DMSO is the medium, a ligand or both, and compare the actual catalyst system.
Evaluate more than conversion
Track product selectivity, catalyst performance and impurities. Include the behavior of base and salts, along with isolation and residual palladium. Strong coordination can be useful in one system and reduce performance in another.
Control water and other impurities according to the catalyst and route. Recovered solvent should be evaluated for carryover that could change catalysis. The complete mixture also needs thermal and compatibility assessment.
For sourcing, share the DMSO specification established for your catalyst system with YUJI.