Synthesis of cyclic hydrazines by ring-closing metathesis of dienes and enynes tethered by an N–N bond

Ring-closing metathesis of dienes and enynes tethered by an N–N bond produced 6- to 10-membered cyclic 1,2-diaza compounds. The enyne RCM adducts were further transformed by Diels–Alder reaction into aromatic compounds.