Catalytic nitration of toluene occurs by use of nitric acid in the presence of bentonite metal nitrates with useful para selectivities,up to a para to ortho ratio 1.0.

• 在皂土硝酸盐催化下，甲苯能被浓硝酸对位选择性硝化，对邻硝化产物比率达1．0以上。