How is N,N-Diethyl-1,4-benzenediamine (CAS: 2198-58-5) typically synthesized?

N,N-Diethyl-1,4-benzenediamine is commonly synthesized through the reaction of 1,4-diaminobenzene with diethylamine. The reaction is performed under anhydrous conditions and at elevated temperatures. Catalysts such as p-toluenesulfonic acid are often used to enhance the reaction rate and improve yield. The overall yield is typically around 90%, and the product can be purified by distillation.