Other Silicon-containing Reagents

Other Silicon-containing Reagents. - Useful reviews of the chemistry 

Enantiomerically pure 8-silyl esters have been prepared by EtAlC -promoted addition of organocuprates to the camphor derivative (208).  

Directed hydrosilyation reactions have seen further advances this year. A number of 0-hydroxy ketones were reduced to anti-1,3-diols 

The intramolecular hydrosilylation of allylic and homoallylic alcohols and the subsequent oxidative cleavage of the initially formed 

HMPA or 4-dimethylarninopyridine (DMAP) is also beneficial under these 195 

Other Silicon-containing Reagents. As a group, acylsilanes have been undervalued as far as the synthetic chemist is concerned. A mild and flexible synthesis of acylsilanes has been reported that is based on the alkylation of methoxy(phenylthio)trimethylsilyl- 

New applications of the Peterson reaction have appeared. Thus, the benzylsilane (139) undergoes 1,4-fragmentation, the benzyl 

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This represents the first large-scale appHcation of a fluoroaryl organometaOic. Other silicon-containing aryl fluorides such as pentafluorophenyldimethyl silanes, CgF Si(CH2)2X (X = Cl NH2 N(0211 )2), are offered commercially as Flophemsyl reagents for derivati2ation of sterols in chromatographic analysis (166). 

Even in the presence of other silicon reagents like PhjSiHj, Michael acceptors are totally unaffected. The addition of catalytic amounts of zinc chloride to the Pd(0)/silane system, however, creates a three-component mixture that allows rapid conjugate reduction of a,p-unsaturated aldehydes and ketones. The conjugate reduction was shown to be both regio- and stereoselective. The use of dideuterodiphenylsilane in the reduction of unsaturated ketones yielded satmated ketones containing one deuterium atom at the P-position. On the other hand, when traces of D2O were added to the nondeuterated mixture, incorporation of deuterium occurred in the a-position (Scheme 16). ... 

Electrically conducting polymer particles such as polypyrrole and polyaniline could also be prepared by dispersion polymerization in aqueous ethanol (31). The oxidation polymerization of pyrrole and aniline has been carried out at the electrode surfaces so far and formed a thin film of conducting polymer. On the other hand, polypyrrole precipitates as particles when an oxidizing reagent is added to a pyrrole dissolved ethanol solution, which contains a water-soluble stabilizer. In this way electrically conducting polymer particles are obtained and, in order to add more function to them, incorporation of functional groups, such as aldehyde to the surface, and silicone treatment were invented (32). 

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