abstract:Ortho acids are the most hydroxylated acid in a set of oxoacids, such as orthophosphoric acid. In general, when an element can form several oxoacids, these are called ortho-, meta- or pyroacids, with the ortho acid being the most hydrated of the three.
Catalyticnitration oftoluene occursby use of nitric acidin the presence of bentonite metal nitrates with useful paraselectivities, up to a para toorthoratio 1.0.