NATURAL BENTONITE CLAY/DILUTE HNO3 (40%)—A MILD, EFFICIENT, AND REUSABLE CATALYST/REAGENT SYSTEM FOR SELECTIVE MONO NITRATION AND BENZYLIC OXIDATIONS. - Bahulayan, Damodaran; Narayan, Gopinathan; Sreekumar, Vellalath; Lalithambika, Malathy (Synthetic Communications, 2002)