JUKE 1967 RING ENLARGEMENTS 1779 enamine of cycloheptanonels and the corresponding acid has been prepared by several routes involving 2-carbethox~~ cycloheptanone~~ 2-cyanocycloheptanoriello and 2- dimethylaminomethylcycloheptanone11 as the starting materials. Thus, the structure of 2 was readily established on the basis of its elemental analysis, its infrared spectrum, and ...