The 7-hydroxy-6-methoxytetrahydroisoquinolines (2 and 8) were transformed to the corresponding 6-hydroxy-7-methoxytetrahydroisoquinolines (4 and 14) via the p-quinol acetates (1 and 9), the p-quinol ethers (3a or 3b, and 10a), and the 6-alkoxy-7-ols (5 or 7, and 13), respectively.