Abstract A series of new symmetrical 3, 6-bis (aryl) bis ([1, 2, 4] triazolo)[3, 4-a: 4′, 3′-c] phthalazines 9a-l has been conveniently synthesized by oxidative cyclization of 1, 4-bis (substituted benzalhydrazino) phthalazines 8a-l promoted by iodobenzene diacetate under mild conditions (12 examples, up to 93% yield). All the 12 compounds were tested in vitro for their antibacterial activity against two Gram-positive bacteria, namely, Staphylococcus ...