IntroductionThis review covers the literature published in 2001. Due to space limitations it is not exhaustive, focusing on what this author considers to be significant contributions to the field in 2001. Descriptions of specific results are often kept to a minimum, with the reader directed to the original paper for more information. The overall approach of this section is similar to that used in previous years, with the inorganic and organometallic aspects of boron reviewed.Exo-substituted heteroboranes are included under a separate section, while complexes bearing tris(pyrazolyl)borate type ligands, boron complexes acting simply as innocent counter-ions and organoboron compounds, in general, have not been included.