Аннотация:The activation by B-H groups of polyhedral boron hydrides (boranes and carboranes) is one of the most actively developing areas of boron chemistry and is of considerable interest to specialists in organic chemistry, organometallic catalysis, and coordination chemistry. This review summarizes data on the directed B-H-activation reactions of polyhedral boron hydrides by transition metal complexes starting from the early works of the 1980s. and ending with the most recent advances in this area. The formation of complexes of transition metals with M…H-B and M-B bonds and their use in the synthesis of various organic derivatives of carboranes are considered.