OBER DIE REAKTIVITAET VON 4-PHENYL-1,2,4-TRIAZOLIN-3,5-DION MIT DIAZOVERBINDUNGEN

Article abstract of DOI:10.1016/S0040-4039(01)90513-1

The aryl substituted diazo compounds 1a-e react with the triazolindione 2 under the evolution of nitrogen and the formation of the stable dipoles 4a-e.The dipoles resulting from the reaction of 1f-k with 2 cannot be isolated (4f-k) but trapped with ethanol (5f-k).Diazo compounds possessing a butadiene unit (7a-d and 10) prefer Diels-Alder-reaction with 2 and yield the polycycles 9a-d and 11.