How is 4-Amino-N,N-diethyl-3-methylanilinium chloride (CAS: 2051-79-8) typically synthesized?

4-Amino-N,N-diethyl-3-methylanilinium chloride is typically synthesized by reacting 3-methylaniline with ethylamine and hydrochloric acid. The reaction involves the substitution of a hydroxyl group with an amino group and subsequent protonation to form the chloride salt. Commonly, this reaction is performed under mild conditions to achieve a yield of about 90%.