How is 4-[3,5-bis(4-carboxyphenyl)-2,4,6-trimethyl-phenyl]benzoic acid (CAS: 1246562-60-6) typically synthesized?

4-[3,5-bis(4-carboxyphenyl)-2,4,6-trimethyl-phenyl]benzoic acid (CAS: 1246562-60-6) is typically synthesized via multi-step reactions. A common approach involves the condensation of 4,4'-dihydroxybiphenyl with 4-chlorobenzoic acid, followed by the introduction of the trimethyl group and the formation of the carboxylic acid groups. This process usually requires the use of catalysts such as palladium(II) acetate and triphenylphosphine, and the reaction is carried out under mild conditions to ensure high selectivity and yield.