Abstract
Substituted allyl derivatives with an internal double bond can be homologated under standard conditions via a 1,2-shift, whereas allylboronic esters with terminal double bonds can also be homologated via a SN' reaction. This allyl isomerization is catalyzed by ZnCl2 and can be suppressed by omitting ZnCl2 during the formation of α-chloroboronic ester. However, in the second step with Grignard reagents, ZnCl2 was added to suppress side reactions of the product formed.
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