Abstract
AbstractA facile synthesis and spectroscopic properties of various oxidation states of the novel benzo[4,5]cyclohept[1,2,3‐ij]isoquinoline system are described. The synthesis involves the condensation of 5H‐dibenzo[a,d]cyclohepten‐5‐one, or of its 10,11‐dihydro derivative, with amino‐acetaldehyde diethylacetal, followed by treatment of the resultant imines with polyphosphoric acid to afford the novel tetracyclic system in high yields.
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