It is probable that tetrahydro acids are first formed, which suffer rearrangement to orthoketone carboxylic acids.
This acid is converted into the acid by soda, and into the Q2 tetrahydro acid by reduction.
From this acid the 0 dihydro and the tetrahydro acids may be obtained, from both of which the hexahydro acid may be prepared.
If s-naphthylamine and 0-naphthol be reduced, tetrahydro products are obtained in which the aminoor oxy-bearing half of the molecule becomes aliphatic in character.
Since it does not form an addition product with bromine, reduction must have taken place in one of the nuclei only, and on account of the aromatic character of the compound it must be in that nucleus which does not contain the amino group. This tetrahydro compound yields adipic acid, (CH 2) 4 (CO 2 H) 2, when oxidized by potassium permanganate.