CARBOCYCLIC AND NITROGEN-CONTAINING FUSED CH-ACIDS WITH AN ANNELATED INDENYL FRAGMENT - THERMOGRAVIMETRIC AND X-RAY STRUCTURAL-ANALYSIS OF 6H-INDENO[1,2-B]QUINOLINE

Based on thermogravimetric characteristics first obtained for the mode l 6H-indeno[l,2-b]quinoline, the scheme of thermal conversions of this compound in the temperature range 20-700 degrees C has been proposed, and the limit of its thermal stability (similar to 300 degrees C) has been determined. This temperature is recommended as the optimum for s ynthesizing fused benzoaza(diaza)fluorenes. Based on the results of X- ray structural analysis, the molecules of the studied indenoquinoline form centrosymmetric pairs, which are arranged in (110) layers. The mo lecules are orientationally disordered. The observed self-association of these molecules is similar to the pi-pi association of fused hetero cyclic systems with pi-excessive and pi-deficient fragments. It has be en suggested that interferon-inducing and antitumor compounds with an annelated indenyl fragment have a common mechanism of action according to the intercalation model of stacking structures.