Reactions of 4-phenyl-1,2,4-triazoline-3,5-dione with some medium-ring polyenes
Abstract
Reaction of 4-phenyl-1,2,4-triazoline-3,5-dione with tropone, azepine, and diazepine gives normal (4 + 2)π cyclo-adducts, whereas reaction with tropolone gives compound (IX).