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Hydrosilylation conjugated alkynes

Other Rh catalysts were also employed for hydrosilation of a,p-unsaturated carbonyl compounds and unsaturated nitriles. Thus, Rh(acac)2 and a tetrakis( jL-acetato)dirhodium cluster were used as catalysts in the hydrosilation of a,P-unsaturated aldehydes. These reactions, however, are not chemoselective, as alkynes, conjugated dienes and alkenes are also hydrosilylated, and allylic heterosubstituents are reduc-tively cleaved. [Pg.556]

Several independent protocols using a combination of transition metal-catalyzed stereoselective hydrosilylation, such as palladium-catalyzed crosscoupling sequence leading to stereodefined r-conjugated alkene derivatives, have been successfully developed in the last decade (4). Alkenylsilanes or siloxanes, prepared via platinum or rhodium complex-catalyzed intermolecular hydrosilylation of terminal alkynes have been highly stereospecifically cross-coupled with aryl and alkenyl halides to give unsymmetrical stilbenes, alkenylbenzenes, and conjugated dienes (Scheme 24) (4). [Pg.1293]


See other pages where Hydrosilylation conjugated alkynes is mentioned: [Pg.134]    [Pg.82]    [Pg.513]    [Pg.254]    [Pg.317]    [Pg.772]    [Pg.773]    [Pg.170]    [Pg.508]    [Pg.372]    [Pg.1279]    [Pg.133]    [Pg.443]    [Pg.503]   
See also in sourсe #XX -- [ Pg.772 ]




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Alkynes conjugated

Hydrosilylation alkynes

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