Photochemistry of Heterocyclic Compounds. (5). The Photolysis of 9-Cyanoacridine 10-Oxides : The Synthesis of Benzo [c]-2-aza-1, 6-oxido [10] annulenes, Oxepino [2, 3-b] quinolines, and 11-Cyano-6-oxo-6H-azepino [a] indoles