Natural kaolinitic clay:A remarkable catalyst for highly regioselective chlorination of arenes with Cl_2 or SO_2Cl_2

摘要

Natural kaolinitic clay containing transition metals such as Fe and Ti in its lattice has been found to exhibit unusual regioselectivity in the liquid-phase chlorination of arenes with either Cl_2 or SO_2Cl_2 as the chlorinating agent para-Chlorinated products are predominant for most of the substrates with an exceptional case of ortho-selectivity for the chlorination of aniline.