Independent of substrate and solvent, the CC bond-forming reaction of organosilicon reagents with α,β-unsaturated carbonyl compounds can be catalyzed by an iridium complex to give exclusively the Mizoroki–Heck-type addition/elimination product (see scheme). This result sharply contrasts the analogous reaction with a rhodium catalyst under similar conditions in which the 1,4-addition product is obtained preferentially. cod=cycloocta-1,5-diene.
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Koike et al. (2003) studied this question.
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