A combined Lewis acid catalyst of InCl(3) and Me(3)SiBr promoted the direct use of enol acetates in the coupling with low-reactive silyl ethers, in which functional groups including ketones and aldehydes survived. Sterically hindered silyl ethers such as ROSiEt(3), ROSiPh(3), ROSit-BuMe(2), and ROSii-Pr(3) were also applicable.
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Onishi et al. (2011) studied this question.
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