Quinones. XIII. Synthesis of 4,5,9,10‐Tetrahydropyrene‐2,7‐dione and Attempted Preparation of Pyrene‐2,7‐dione
The titel quinones 7 and 9 are of interest as electron acceptors for organic conductors. The synthesis of their conjugate hydroquinones 6 and 8 via the metacyclophane derivative 3 is described. The tetrahydropyrene‐2,7‐dione 7 – obtained by oxidation of 6 – possesses only a limited stability, whereas pyrene‐2,7‐dion (9) proved to unstable to be isolated.