Electrophilic aromatic substitution Nitrated硝化 NH2 Sulfonated磺化 NH NH NhaHSO4 NH-SO,H NH3 H2SO4 △ SO3H SO3Electrophilic aromatic substitution NH2 NH2 NO2 Nitrated 硝化 Sulfonated 磺化 NH2 H2 SO4 NH3HSO4 NH SO3H NH2 SO3H NH3 + SO3 -