Hydrosilylation reaction of various fluoroalkylated alkynes with Et(3)SiH in the presence of a catalytic amount of Co(2)(CO)(8) was investigated. The hydrosilylation of the alkynes having fluoroalkyl and aryl groups took place smoothly with good regioselectivity (ca. 80:20). In sharp contrast, the reaction of the alkynes having a fluoroalkyl group and a benzyl-type substituent, or various propargyl alcohols gave the corresponding vinylsilanes in an excellent regio- and stereoselective manner. Treatment of the vinylsilanes with various aldehydes in the presence of Zn(OTf)(2) and TBAF afforded the coupling products in good yields.

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Polyphenylalkene derivatives Q 0740Highly Stereoselective One-Pot Synthesis of Tetrasubstituted Alkenes via Carbopalladation Reaction of Fluorine-Containing Acetylene Derivatives. -The title practical one-pot method is applicable to a variety of fluoroalkylated alkynes, e.g. (I). -(KONNO*, T.; TAKU, K.-I.; ISHIHARA, T.; J. Fluorine Chem. 127 (2006) 7, 966-972; Dep. Chem. Mater. Technol., Kyoto Inst. Technol., Sakyo, Kyoto 606, Japan; Eng.) -Schulze 44-099