B(C 6 F 5 ) 3 reacts with simple vinyl esters by electrophilic addition to the C C bond and subsequent proton transfer and elimination of C 6 F 5 H to yield the chelated vinylborane products (C 6 F 5 ) 2 B{κ 2 - C H CHOC( O )R} (R = Me, Ph).
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Dash et al. (2002) studied this question.
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