3,3',5,5'-Tetramethylbiphenyl is used as a precursor for the preparation of 3,3',5,5'-tetramethylenebiphenyl tetraanion. It is also used to prepare biphenyl-3,3',5,5'-tetracarboxylic acid by the oxidation of with potassium permanganate.
Suzaki, Y.; Shirokawa, M.; Yagyu, T.; Osakada, K. Synthesis and Reactions of PdII Complexes with Aryl, Aroyl, and Iminoaroyl Ligands-Insertion of CO and RNC into the Pd-Ar Bond and Intermolecular Coupling of the Ligands. Eur. J. Inorg. Chem. 2015, 2015 (3), 421-429.
Kapdi, A. R.; Dhangar, G.; Serrano, J. L.; De Haro, J. A.; Lozano, P.; Fairlamb, I. J. S. [Pd(Phbz)(X)(PPh3)] palladacycles promote the base-free homocoupling of arylboronic acids in air at room temperature. RSC Adv. 2014, 4 (98), 55305-55312.