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$$\text{R--NH}_2 + \text{R'--X} \xrightarrow{\Delta} \text{R--NH--R'} + \text{HX} \quad (2^\circ \text{ Amine})$$
$$\text{R--NH--R'} + \text{R'--X} \xrightarrow{\Delta} \text{R--N(R')}_2 + \text{HX} \quad (3^\circ \text{ Amine})$$
$$\text{R--N(R')}_2 + \text{R'--X} \to [\text{R--N(R')}_3]^+\text{X}^- \quad (4^\circ \text{ Quaternary Ammonium Salt})$$
