Organosilicon compounds carbanions

Organosilicon compounds receive attack of nucleophilic, electrophilic, and homolytic reagents. The latter is related to the formation of radicals and divalent species. Organosilicon reactive intermediates corresponding to free radicals, carbenium ions, carbanions, and carbenes play important roles in these reactions. These are sUyl radicals, silylium... 

Organosilicon Compounds. MeSiCl3 is an important precursor to organosilicon compounds. It reacts with carbanions to form corresponding alkyl(aryl) methylsilanes. Grignard and... 

Reactive intermediates are species that are so kinetically unstable that they cannot be isolated or observed under normal conditions. In organic chemistry, the radicals (R3C ), carbanions (R3C ), carbocations (R3C ), and car-benes (R2C ) are the more-common intermediates. The area, and the resulting chemistry, is far richer in organosilicon chemistry, because many of the bonding situations that produce quite stable organic compounds are highly reactive when Si replaces C. 

Silicon.— Allylsilanes are outstandingly useful carbon nucleophiles as a result of their ability to react with electrophiles in a controlled and specific manner to form new carbon-carbon bonds. Furthermore, metallation to give a-(trimethyl-silyl)allylic carbanions introduces the possibility of an additional level of control over the mode of attack (either a or y) exhibited by the allylsilane. It is not surprising, therefore, to find the chemistry of these species occupying a prominent position in this year s organosilicon literature, and in addition to the many applications reported some new routes to these compounds have been described. One such example is shown in Scheme 13, in which the starting silyl sulphone is readily prepared by oxidation of the product obtained from reaction of thio-phenol with vinyltrimethylsilane." ... 

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