Ozols, J.; Vanags, G. published the artcile< Bromo-3-ethylidenephthalide and its transformations>, Reference of 82-73-5, the main research area is phthalides bromo; bromo phthalides; ketone aromatic.
A mixture of 7 g. 4-bromophthalic anhydride, 4.4 g. (EtCO)2O and 1.6 g. dry EtCO2Na was heated 3 hrs. at 170-80° and poured into 75 ml. H2O to yield 61% bromo-3-ethylidenephthalide (I), m. 115-16° (CCl4). With alkalis, I did not isomerize, but formed bromopropiophenone-o-carboxylic acid (II) which appeared in a tautomer form as 3-hydroxy-3-ethylbromophthalide (III). To 0.85 g. I in 20 ml. MeOH was added MeONa prepared from 0.08 g. Na and 2 ml. MeOH, and the mixture heated on a water bath 0.5 hr. and worked up to give 0.5 g. III m. 114-15° (EtOH). Similarly, III was obtained from I and 10% KOH. 10 references.
Latvijas PSR Zinatnu Akademijas Vestis, Kimijas Serija published new progress about 82-73-5. 82-73-5 belongs to class bromides-buliding-blocks, and the molecular formula is C8H3BrO3, Reference of 82-73-5.
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary