1,4-Phenylenediacetic acid is a building block.1,2 It has been used in the synthesis of metal-ligand coordination polymers.
1.Braverman, M.A., and LaDuca, R.L.Luminescent two- and three-dimensional zinc coordination polymers containing isomers of phenylenediacetate and a kinked tethering organodiimineCryst. Growth Des.7(11)2343-2351(2007) 2.Yang, G.-P., Wang, Y.-Y., Zhang, W.-H., et al.A series of Zn(II) coordination complexes derived from isomeric phenylenediacetic acid and dipyridyl ligands: syntheses, crystal structures, and characterizationsCrystEngComm12(5)1509-1517(2010)