THE INVERSE ELECTRON-DEMAND DIELS-ALDER REACTION IN POLYMER SYNTHESIS.3. MODEL DIELS-ALDER REACTIONS OF SOME BIS(1,2,4-TRIAZINES WITH DIENOPHILES AND SOME BIS-DIENOPHILES WITH HETEROCYCLIC DIENES

Arylenedi-(1,2,4-triazines) appear not to react with dienophiles other than those, e.g. enamines, which are highly electron-rich; Diels-Alde r cycloadditions of 1,2,4,5-tetrazines, however, readily occur with bi s-dienophiles such as diethynyl-aromatic compounds and bis(enol trimet hylsilyl ethers).