C10H7-NH2 = naftilamina
C10H7-NH2 + I-CH3 => C10H7-NH-CH3 + HI
metil-naftil-amina
C10H7-NH-CH3 + I-CH3 => C10H7-N-(CH3)2 + HI
dimetil-naftil-amina
C10H7-N-(CH3)2 + I-CH3 => C10H7-[tex]N^{+}[/tex]-(CH3)3 + HI
C10H7-[tex]N^{+}[/tex]-(CH3)3 = trimetil-naftil-amoniu
=> 3 moli maxim