Zhang, Qian published the artcileDDQ: the chlorinating reagent and oxidant for the ligand-directed ortho-chlorination of 2-arylpyridines, Quality Control of 85237-71-4, the publication is Organic Chemistry Frontiers (2014), 1(6), 694-697, database is CAplus.
A new and simple protocol for palladium-catalyzed ligand-directed ortho-chlorination of 2-arylpyridines with DDQ was developed, generating the chlorinated products in good to excellent yields. DDQ played dual role as both the chlorinating reagent and oxidant in this reaction. Moreover, high regioselectivity was observed for 2-arylpyridines bearing a meta-substituent in the aryl ring moiety, and chlorination could take place at the less sterically hindered ortho-C-H bond.
Organic Chemistry Frontiers published new progress about 85237-71-4. 85237-71-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is 5-Methyl-2-(p-tolyl)pyridine, and the molecular formula is C3H6BrNaO3S, Quality Control of 85237-71-4.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem