Naphthalic Anhydride from Tetrahydro-7-methylfluor- rmthene-10-carboxyIic Acid (IV) .-A solution of 0.2 g. of the acid (IV) in 30 cc. of hot acetic acid and a solution of 2 g. of potassium dichromate in 20 cc. of water plus 0.5 cc. of concentrated sulfurico acid were mixed and heated twenty-four hours at 100 . After adding 30 cc. of water and 10 cc. of sulfuric acid, the cooled solution was ex- tracted with three 50-cc. portions of ether. The ether was removed and the residue ...
