I am presently working in ruthenium catalyzed C-H activation. I have amine, and copper salt in the medium. dioxane is solvent. My product will elute in ethyl acetate. I am observing intense black/purple colouration in reaction mixture which elutes as a solid mass along with my product. I am guessing some sort of complexation. I have tried ethyl acetate/water work up, celite filtration for purification but the products are not pure. Please provide your suggestions.