hydrazone of N-aminotetrahydroquinoliiie and acetophenone was ground in a mortar with 5 g. of powdered anhydrous zinc chloride and the mixture was heated at 120" for one hour. The mass was then warmed with several small quantities of dilute hydrochloric acid to dissolve the zinc chloride. The residual gummy brown precipitate was filtered, dried, powdered and extracted with ether to separate the indole from brown ether-insoluble by- ...