. Compd 5 (7 g) was added to AcOH (16.7 ml), HC1 (33.4 ml), and H30 (2.2 ml); the mixt was heated at 100°for 4 hr, then cooled, and poured into crushed ice-H30. The solid (5.8 g, 97%) was filtered and recrysted from Me3CO-petr ether: mp 133-135°; *m!$H 224 (e 4620) and 272 µ (14,200). Anal. (C14H1604) C, H. 1.2.3.4-Tetrahydro-6-methoxy-l-naphthalenepropionic Acid (7). Hydrazine hydrate (2.5 ml, 80% soln) was added to a soln of 6 (3 g) and KOH (2.7 g) in 1,2-propanediol (15 ml), the mixt was heated to 120°, and H30 was distd off. After this distillation ceased, the temperature was gradually raised to 180-190°and was maintained there under reflux for 4 hr. The reaction product was then poured into ice-H30, and acidified with HC1. The precipitated acid 7 (1.67 g, 59%) was filtered and recrystd from Me3CO: mp 122-123°;Xmax 279
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