| abstract |
(57) [Summary] [Structure] 2,3-Thiophensaccharin-5-carboxylic acid represented by the following formula (I) is decarboxylated in a solvent in the presence of a catalyst to give a compound represented by the following formula (II). 2,3- Produces thiophene saccharin. [Chemical 1] [Effect] By using 2,3-thiophensaccharin-5-carboxylic acid, which is a novel compound, as a raw material, 2,3-thiophensaccharin, which is a compound useful as a sweetener, can be selectively obtained. |