How is hexadecyl-trimethyl-ammonium sulfate (CAS: 68214-07-3) typically synthesized?

Hexadecyl-trimethyl-ammonium sulfate is typically synthesized by reacting hexadecylamine with trimethylamine in the presence of an acid catalyst. The reaction produces hexadecyltrimethylammonium chloride, which is then neutralized with sulfuric acid to form the sulfate salt. This process involves good yield and selectivity, and the reaction is generally carried out under mild conditions to ensure product quality.