The enantioconvergent hydroboration of racemic allenylstannane (±)-1 with ((d)Ipc)(2)BH converts both enantiomers of (±)-1 into the enantioenriched crotylborane (S)-E-3. Subsequent crotylboration of aldehydes with (S)-E-3 provides (E)-stannyl-homoallylic alcohols 5 in good yields and with excellent enantioselectivity.
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Chen et al. (2011) studied this question.
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