1－氟萘的单磺化只产生4位取代产物，而其它三种1位卤代萘还产生部分的5位取代产物，进一步磺化得到4，7－二磺酸、2，4－二磺酸及少量的2，4，7－三磺酸。

• Monosulfonation of l- fluoronaphthalene yields only the 4 -s,where the three other l-Halogenonaph-thalenes yield in addition some 5-S, Further sulfonation of any of the four l-halogenonaphthalenes-4-S's yields a mixtures of the 2,4-S_2 adn 4,7-S_2 , and eventually also some 2,4 , 7-S_3.Sulfonatlon of 2-chloro-and 2-Bromonaphthalenes with l.