3-Hydroxy-, 3-hydroxy-1 -methyl-. and 3-hydroxy-6.7-dimethoxy-1 -methylisoquinoline have been shown by ultraviolet spectroscopy to exist as lactim tautomers in non-hydroxylic solvents such as diethyl ether, and as lactam tautomers in water. 1 -Chloro-3-hydroxyisoquinoline is in the hydroxy-or lactim form in all common solvents, and 3-hydroxycinnoline is in the lactam form in all solvents tried.
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