11. Studies show that tautomer II is most common in ethanol, water, and DMSO. 12. The position of the nitrogen with the hydrogen on it determines how the tautomer is named. 13. Sometimes the minor tautomer is called hypophosphorous acid and the major tautomer is called phosphinic acid. 14. Sometimes the minor tautomer is called hypophosphorous acid and the major tautomer is called phosphinic acid. 15. It is a tautomer of ethynol. 16. HOP ( O ) H 2 exists in equilibrium with the minor tautomer HP ( OH ) 2. 17. Through movement of this hydrogen and electrons, the second tautomer form, 2-hydroxypyridine is formed. 18. Glutaconic anhydride, which forms by dehydration the diacid, exists mainly as the dicarbonyl tautomer in solution. 19. Thebacon is generated by the esterification product of the enol tautomer of hydrocodone ( dihydrocodeineone ) with acetic acid. 20. The tautomer on the left, featuring a 4-hydroxy group, the C4 carbon, is dominant.
