Terminal alkynes hydrosilylations, triethylsilane

Additional Hydrosilylations. Hydrosilylations of terminal alkynes with triethylsilane (eq 1) have been improved in terms of their regio- and stereocontrol as well as in other aspects of their operation. Through the employment of Pt(DVDS), Pt-catalyzed hydrosilylations of 1-alkynes can now be performed at room temperature and in water with very high selectivity for the ( )-/3-vinylsilanes (eq 20). It has also been shown that Pt02 catalyzes the internal hydrosilylation of aryl alkynes under orthosubstituent regiocontrol (eq Strong preference for the... 

Hydrosilylations. Addition of triethylsilane across multiple bonds occurs under the influence of a large number of metal catalysts. Terminal alkynes undergo hydrosilylations easily with triethylsilane in the presence of platinum, rhodium, ruthenium, osmium, or iridium catalysts. For example, phenylacety-lene can form three possible isomeric hydrosilylation products with triethylsilane the (Z)-/3-, the and the a-products... 

Lewis acids have also been demonstrated to catalyze terminal and internal alkyne hydrosilylation. Aluminum chloride and EtAlCl2 were found to be very active catalysts for the hydrosilylation with triethylsilane producing the corresponding (Z)-vinylsilane with high regio- and stereoselectivieties as a result of trans addition (4). 

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