A thiadiazole-fused N,N-dihydroquinoxaline: antiaromatic but isolable

Org Lett. 2007 Mar 15;9(6):1073-6. doi: 10.1021/ol070013i. Epub 2007 Feb 20.

Abstract

An antiaromatic-aromatic pair of peralkynylated heterocycles readily interconvert via redox reactions. [reaction: see text]