The regioselectivity of the addition of 2,4,6-trimethylphenol to 2,4dichloro-3,6-dimethylpyridine can be controlled by the proper choice of catalyst and solvent. The use of catalytic copper(I) salts and pyridine as solvent results in exclusive addition at C-2. In their absence, a mixture of regioisomers is obtained in which addition at C-4 is dominant.
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