Boron-silicon bond

The most studied class of boron polymers containing boron-silicon bonds are the carboranylenesiloxane polymers. The history of these polymers was discussed at the beginning of this chapter. The more recent advances in this group of polymers and in silicon-containing borazine and boroxine polymers are discussed in later sections of this chapter. In this section, some remaining groups of silicon-containing boron polymers are discussed. 

The first report on the addition of boron-silicon bonds to carbon-carbon triple bonds appeared in 1986.216 In this... 

Boron—nitrogen coordination polymers, with ferrocene, 6, 208 Boron nucleophiles, in conjugate additions asymmetric 1,4-additions, 10, 388 mechanisms, 10, 384 to nitroolehns, 10, 388 to a,/3-unsaturated amides, 10, 386 to a,/3-unsaturated esters, 10, 386 to a,/3-unsaturated ketones, 10, 384 Boron-silicon bonds, addition to alkenes, 10, 760 to alkynes, 10, 758 to allenes, 10, 760 to carbenoids, 10, 766 to 1,3-dienes, 10, 762 to isocyanides, 10, 765... 

Hexaphenyldisilane allowed to react with 1 5 Na,K-alloy in anhydrous ether under Ng, excess alloy removed by amalgamation, the resulting green ethereal triphenylsilyl-K added to an ethereal suspension of B-trichloro-N-trimethyl-borazine, and the product isolated when the green color has disappeared B-tris(triphenylsilyl)-N-trimethylborazine. Y 78%.—This is the first prepn. of compounds containing boron-silicon bonds. F. e. s. A. H. Gowley, H. H. Sisler, and G. E. Ryschkewitsch, Am. Soc. 82, 501 (1960). 

Carbon-Carbon Bond-Forming Reactions of Compounds of Boron, Silicon, and Tin... 

The methods available for synthesis have advanced dramatically in the past half-century. Improvements have been made in selectivity of conditions, versatility of transformations, stereochemical control, and the efficiency of synthetic processes. The range of available reagents has expanded. Many reactions involve compounds of boron, silicon, sulfur, selenium, phosphorus, and tin. Catalysis, particularly by transition metal complexes, has also become a key part of organic synthesis. The mechanisms of catalytic reactions are characterized by catalytic cycles and require an understanding not only of the ultimate bond-forming and bond-breaking steps, but also of the mechanism for regeneration of the active catalytic species and the effect of products, by-products, and other reaction components in the catalytic cycle. 

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