FEBRUARY 5, 1! 358\!'. e show that 3-nitro-2-(2-thenoyl)-benzoic acid (111) rearranges to g- iiitro-3-(%-tliritoyl)-beiizoic acid (IV) in 10070 sulfuric acid at TO", contrary to two previous reports of other results. A probable reason for the previous reports is advanced. Trifluoroacetic acid, methanesulfonic and polyphosphoric acid are shoivn to be unsuitable acidic reagents for effecting the rearrangement of 111 to IV. Both 4-nitro-2-(2-thenoyl)- ...
![3-chloro-7-nitro-3-[2]thienyl-phthalide Structure](https://image.chemsrc.com/caspic/422/105905-23-5.png)