Synthesis of a ligand imposing tetrahedral coordination: 1,10-phenanthroline-2,9-bis(phenyl-2-acetic acid) is prepared via palladium catalysed cross-coupling of an aromatic halide and an ortho-substituted aryl stannane.
Bates, G. B., & Parker, D. (1996). Synthesis of a ligand imposing tetrahedral coordination based on 1,10-phenanthroline. Tetrahedron Letters, 37(2), 267–270. https://doi.org/10.1016/0040-4039(95)02146-9