New developments in the chemistry of organoantimony and -bismuth rings

Novel organoantimony homocycles comprise a three-membered antimony ring, R3Sb3, organoantimony polycycles, R4Sb8, R5Sb7, and transition metal carbonyl complexes with the t-Bu4Sb4 or t-Bu3Sb4 ligand. In this review the use of t-Bu4Sb4 as a source for complexes with the Sb-2 or cyclo-Sb-3 ligands and the synthesis and characterisation of the first organobismuth monocycles, RnBin (n = 3, 4) are also discussed.