Cohen3 made the interesting discovery that 1-vinylnaphthalene can function as a diene in the Diels-Alder reaction. From the reaction of this hydrocarbon with maleic anhydride in xylene, cis-1, 2, 3, 10a-tetrahydrophenanthrene-1, 2-dicarboxylic anhydride (Ia) was~ btained.~ The product was isomerized to the naphthalenic compound 1, 2, 3, 4- tetrahydrophenanthrene-1, 2-dicarboxylic anhydride (IIa) by treatment with glacial acetic ...
![3a-methyl-11,11a-dihydro-10H-naphtho[2,1-e][2]benzofuran-1,3-dione Structure](https://image.chemsrc.com/caspic/089/6636-42-6.png)
