Synthesis, Crystal Structure, and Some Transformations of 9,12-Dichloro-ortho-Carborane

Reaction of ortho-carborane with anhydrous AlCl3 in chloroform results a mixture 9-chloro, 9,12-dichloro, and 8,9,12-trichloro derivatives 9,12-dichloro-ortho-carborane being the main product. Molecular crystal structure was determined by single X-ray diffraction. The 9,12-Cl2-1,2-C2B10H10 appeared to be nearly isostructural 9,12-dibromo-ortho-carborane: packing is built layers which molecules are connected via weak hydrogen halogen bonds. A synthetic scheme for preparation hexachloro derivative cobalt bis(dicarbollide) Cs[8,8′,9,9′,12,12′-Cl6-3,3′-Co(1,2-C2B9H8)2] from has been proposed.