Addition of Organotin and -silicon Reagents

The use of organosilanes for rhodium-catalyzed conjugate addition is also feasible. In 2001, Mori reported that the catalytic conjugate addition of aryl(ethyl)silanediols to a,f -unsaturated carbonyl compounds takes place in the presence of [Rh(OH)(COD)]2 in a 

For rhodium-catalyzed conjugate addition using organosilanes, several other conditions have been reported [34]. Cationic rhodium catalysts such as [Rh(COD)2]BF4 and ]Rh(COD)(MeCN)2]BF4 are more active than neutral rhodium catalysts such as ]Rh(OH)(COD)]2. 

Recently, triphenylbismuth has been used for rhodium-catalyzed conjugate addition (Eq. 4) ]36]. The reaction carried out in the presence of [RhCl(COD)]2 or 

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