Mayuranathan, P. S. published the artcile< Thermal decomposition of mercuric o- and m-nitrobenzoate and 4-nitrophthalate>, Reference of 16426-64-5, the main research area is .
(o-O2NC6H4CO2)2Hg (18 g.) heated at 180° until evolution of CO2 ceased (4 hrs.) gave 16% (o-O2NC6H4)2Hg (I), a crystalline solid insoluble in organic solvents. I (4 g.) heated 1 hr. with 20 cc. 2M K perbromide or periodide, the resulting oils freed from halogen, and crystallized gave 1 g. o-BrC6H4NO2, m. 39°, or o-IC6H4NO2, m. 49°, resp. (m-O2NC6H4CO2)2Hg (II) did not decompose but gave anhydro-2-hydroxymercuri-3-nitrobenzoic acid (III). Thus, 10 g. II heated 6 hrs. at 190° gave III, soluble in warm alkali. III (5 g.) similarly treated with K perbromide or periodide, the solution evaporated to remove excess halogen, acidified, and extracted with Et2O, the solution washed with thiosulfate, dried, and evaporated gave 1 g. 2,3-Br(O2N)C6H3CO2H, m. 185°, and 2,3-I(O2N)C6H3CO2H, m. 205°, resp. 4-Nitrophthalic acid (23 g.) in 16 g. Na2CO3 dissolved in 20 cc. H2O treated with 45 g. Hg(OAc2) in 150 cc. H2O containing 1 cc. AcOH gave Hg 4-nitrophthalate (IV). IV (20 g.) heated 6 hrs. at 190° gave anhydro-2-hydroxymercuri-4-nitrobenzoic acid (V), identical with the product obtained from p-O2NC6H4CO2H (VI). V brominated or iodinated as above gave 2-Br- and 2,4-I(O2N)C6H3CO2H. Hydrolysis of V gave VI.
Journal of the Chemical Society published new progress about 16426-64-5. 16426-64-5 belongs to class bromides-buliding-blocks, and the molecular formula is C7H4BrNO4, Reference of 16426-64-5.
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary