Abstract Silicon tetrachloride-ethanol induced self condensation of ketones to yield tri-or hexasubstituted benzenes, can be diverted in a variety of ways, dependent on the steric hindrance of the ketone. A number of examples of cyclic ketone condensations are given, and the surprising result from condensation of propiophenone as compared with acetophenone is presented.
![14,15-dihydro-9H-diindeno[1,2-a,2',1'-c]fluorene Structure](https://image.chemsrc.com/caspic/052/17509-71-6.png)
