The chelation of the nucleophile to the metal catalyst (if used) and the lactone can influence the regioselectivity and stereoselectivity of the reaction.
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ethyl 2-{(2R,3R,4S,5R,6R)-3,4,5-tris(benzyloxy)-6-[(benzyloxy)methyl]-tetrahydro-2-hydroxy-2H-pyran-2-yl}-2,2-difluoroacetate
(1S,3S)-3-Benzenesulfonyl-4-methyl-1-phenyl-pent-4-en-1-ol
6-hydroxy-4-(4-methoxyphenyl)-2-(2-pyridil)pyridine
