Group III Boron

The ever-expanding literature on organoboron chemistry, and the strictures of space, prevent the comprehensive coverage of this topic. However, an attempt has been made to give a balanced selection of the major work across the entire field of organoboron chemistry. 

The important contributions of Professor H. C. Brown to chemistry were recognized on the occasion of his 66th birthday with the dedication to him of an issue of the Journal of Organometallic Chemistry Many of the articles in this issue dealt with organoboron chemistry and are referenced throughout this Report. An excellent book containing extensive tabulations of n.m.r. data of organoboron compounds appeared in 1978.  

The following dissertation titles were abstracted in 1978 Conformational Analysis of Triarylboranes, Triarylsilanes and Tetraarylethanes , An Investigation of the Coordinating Properties of the Boranocarbonates and Tetra-hydroborate , Mechanistic and Synthetic Studies of the Reactions of Halogens 

Noth and B. Wrackmeyer, NMR Basic Principles and Progress, Vol. 14 Nuclear Magnetic Resonance Spectroscopy of Boron Compounds , Springer, Berlin, 1978. 

Several polyfluoroalkenylcarboranes have been prepared via reaction of l-methyl-2-lithium-o- or -w-carborane with the fluoro-olefins CFjiCFj, CFa CFCl, CF2 CF CF3, and CF2 C(CF3)j, e.g. 

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In Group III, boron, having no available d orbitals, is unable to fill its outer quantum level above eight and hence has a maximum covalency of 4. Other Group 111 elements, however, are able to form more than four covalent bonds, the number depending partly on the nature of the attached atoms or groups. 

A p-type (for positive type) semiconductor is an electron poor material comprised of silicon (a Group IV element) doped with something like boron (Group III). Boron atoms have one less valence electron than silicon atoms, so the crystalline lattice has fewer electrons—or more positive holes —in it compared to pure silicon. This is illustrated in Figure 10.13. 

Group III. Boron donor ligands. The preparation of a range of metal complexes of B6H10 has been reported (equation 42a) following preliminary publications.177-179... 

J. P. Maher Group III Boron, aluminium, gallium, indium, and thallium, pp. 40-103 (269). 

Group III.—Boron. It has only recently been conclusively shown that the stoicheiometry of the boric acid-tartaric acid complex is 1 1. Kinetic results from T-jump experiments indicate attack by an alcohol-oxygen lone-pair at the electron-deficient boron. Other references to reaction mechanisms of three-co-ordinate boron compounds deal with hydrolysis and methanolysis of boron halides, with disproportionation of boranes, and with Sh2 radical reactions of alkylboranes. ... 

Group III Boron, Aluminium, Gallium, Indium, and Thallium... 

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