Thiophene-2-carboxylic acid
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| Other names
 2-thenoic acid; tenoic acid; Rhinotrophyl  | |
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| ECHA InfoCard | 100.007.659 | 
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| Properties | |
| C5H4O2S | |
| Molar mass | 128.15 g·mol−1 | 
| Appearance | white solid | 
| Melting point | 125–127 °C (257–261 °F; 398–400 K) | 
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). 
Infobox references  | |
Thiophene-2-carboxylic acid is an organic compound with the formula SC4H3CO2H. It is one of two monocarboxylic acids of thiophene, the other being thiophene-3-carboxylic acid. Copper(I) thiophene-2-carboxylate is a catalyst for Ullmann coupling reactions.