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Arsole
"Yes, believe it or not, there is actually a molecule called //Arsole//... and it's a ring! It is the arsenic equivalent of pyrrole, and although it is rarely found in its pure form, it is occasionally seen as a sidegroup in the form of organic //arsolyls//. For more information, see the paper with probably the best title of any scientific paper I've ever come across: "Studies on the Chemistry of the Arsoles", G. Markl and H. Hauptmann,//J. Organomet. Chem//., **248** (1983) 269. Although the class of molecules with this general structure are called 'arsoles', the specific molecule shown on the right is actually called 'arsenole' (not to be confused with the London football club, Arsenal). Contrary to popular belief, new research (see reference below) shows that arsoles are only moderately aromatic... Incidentally US patent number US 3 412 119 by the Dow Chemical Company is entitled 'Substituted Stannoles, Phospholes, Arsoles, and Stiboles' - I didn't know there was a substitute for an arsole... Furthermore, if six of them are bonded together we can apply the prefix 'sexi', to get 'sexiarsole'. And the structure where arsole is fused to a benzene ring is called 'benzarsole'; 6 of these bonded together would be called 'sexibenzarsole' (although neither of those sexi- molecules have been synthesised yet). Another well known poisonous arsenic molecule is the simple hydride, called 'arsine', with formula AsH3."

May, P. (2009, October). //Molecules with silly or unusual names.// Retrieved October 21, 2009 from http://www.chm.bris.ac.uk/sillymolecules/sillymols.htm

//Arsole//. Retrieved on October 21, 2009 from http://en.wikipedia.org/wiki/Arsole 
 * [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Arsole.png/100px-Arsole.png width="100" height="152" align="center" caption="Arsole.png" link="@http://en.wikipedia.org/wiki/File:Arsole.png"]] || [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Arsole-3D-vdW.png/100px-Arsole-3D-vdW.png width="100" height="94" align="center" caption="Arsole-3D-vdW.png" link="@http://en.wikipedia.org/wiki/File:Arsole-3D-vdW.png"]] ||
 * Other names || arsenole, 1//H//-arsole ||
 * CAS number || 287-77-4 ||
 * Molecular formula || C4H5As ||
 * Molar mass || 128.00 g mol−1 ||