O K2Cr2O H2SO4 1.4-荼醌 H2 OH Fecl H,O, HC 1,2-萘醌Organic Chemistry Organic Chemistry Xiamen Xiamen University University OH K2Cr2 O 7 H 2SO 4 O O NH2 OH Fe C l 3 H 2O , HCl O O 1,4-萘醌 1,2-萘醌