How is 2',5'-Dimethyl-1,1':4',1''-terphenyl-4,4''-diamine (CAS: 152219-88-0) typically synthesized?

2',5'-Dimethyl-1,1':4',1''-terphenyl-4,4''-diamine is typically synthesized via a multistep process involving the alkylation of a terphenyl core followed by diazotization and reduction. Commonly used reagents include methyl iodide, sodium nitrite, and hydrochloric acid. The synthesis involves careful control of reaction conditions to ensure high yield and selectivity. This compound is often synthesized in a research laboratory setting due to the complexity of the reaction sequence.