Enol silyl ethers of acylsilanes

When iridium complexes, [IrCl(CO)3]n and Ir4(CO)12, are used to catalyze the reaction of terminal alkenes with HSiR3 and CO, good yields of enol silyl ethers of acylsilanes are obtained. One molecule of CO and two molecules of silane are incorporated regioselectively at the terminal carbon atom of the alkene to form a siloxy(silyl)methylene unit [Eq. (38)].107... 

Enol silyl ethers of acylsilanes. On treatment with butyllithium and trimethyl-silyl chloride, these compounds undergo enol silylation, tellurium-lithium exchange, and O — C silyl migration. The lithium enolates are further silylated. 

Carbonylative hydrosilylation. IrCl(CO)3 [or lr4(CO)i2] catalyzes this reaction with terminal alkenes to form the enol silyl ethers of acylsilanes. Acetal, epoxide, and cyano groups are not affected. 

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