Hydromagnesiation of alkynylsilanes 1 gives (Z)-α-silylvinyl Grignard reagents 2, which are reacted with aldehydes or ketones to afford (Z)-β-silyl allylic alcohols 3 in high yields; intermediates 3 can undergo the desilylation reaction in the presence of anhydrous KF to give (E)-allylic alcohols 4 in good yields.
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