MI-0070 (OTTO) 1-Methylimidazolium hydrogen sulfate, 95% Cas 681281-87-8 - used as a component of a catalytic system along with chlorotrimethylsilane used in the preparation of 3,4-dihydropyrimidin-2(1H)-ones and hydroquinazoline-2,5-diones. MI-0070 (OTTO) 1-Methylimidazolium hydrogen sulfate, 95% Cas 681281-87-8 - used in the leaching of copper and zinc in brass dross using H2O2 as an oxidant.