Tables of ¹¹B-NMR Data

Abstract

Considering the large number of classes of compounds a number of approaches are possible for organizing the material covered in this book. The following problems had to be solved (i) to list ¹¹ B NMR data for more than 3000 compounds (ii) to relate the contents of the tables as closely as possible with the discussion in the preceding chapters (iii) to provide an easy access to the NMR information of certain classes of compounds related by their structure and substituents at boron. The approach finally chosen is not systematic in a strict sense, but we believe it is practical both for the preparative chemist as well as for those scientists who wish to obtain information about ¹¹ B chemical shifts and structures of boron compounds. Thus we provide structural symbols at the head of each table as a guideline. These symbols show the atoms to which the boron atom is directly connected. In addition the headlines of each table indicate the classes of compounds treated. As a consequence compounds with the same structural unit, e.g., CBN₂, will be found not only in one table, since this structural unit will be met in bis(amino)organylboranes, borazines, tetraazadiborines etc. Moreover it was necessary to subdivide several tables in order to keep their lengths within a manageable size. A subdivision according to different substituents at boron and different structures (cyclic, noncyclic) was also necessary. The term “substituted” in the headlines of the tables is used to indicate the presence of an organometallic or complex organic group bound either to boron or to the atom next to boron, e.g., carbon, oxygen, nitrogen; however, this term has been omitted when the overall number of compounds per table was small.