New Sb2O2 Ring Compounds

Oxidation of diphenylantimony fluoride and thiocyanate with t-butyl hydroperoxide leads to tetrameric products containing a four-membered Sb2O2 ring with a further antimony atom, carrying respectively either two fluorine or two thiocyanate substituents, attached via a single oxygen bridge to each of the ring antimony atoms. This is in contrast to the formation of simple four-membered ring compounds when the corresponding bromide and chloride are oxidised. The reaction between [Ph2SbOBr]2 and silver oxalate is not a simple substitution and the product is a complex salt whose cation contains a planar twelve-membered Sb6O6 ring.