Arsole gets its name because
it's a ring compound (-ole) based from arsenic. Arsoles are moderately aromatic
pyrrole molecules. There is a paper on these compounds: "Studies on
the Chemistry of the Arsoles", G. Markland and H. Hauptmann, J. Organomet. Chem.
Can the title of a scientific paper get better than that?
Arsole is the arsenic analogue
of the unsaturated five-membered heterocycles pyrrole and phosphole. Pure
arsole has not been isolated, but theoretical studies show that it has much
less aromatic character than pyrrole, and that, unlike pyrrole, its (and
phosphole's) heteroatom-bonded hydrogen atom extends out of the plane formed by
the carbon atoms.
