Ketones syn-aldols

An ingenious way of getting a syn ester aldol product is to do the more reliable ketone syn aldol with a bulky group (to ensure the ds-enolale is formed) and then to oxidize off the bulky group. Here s what we mean. The starting material is very like the f-butyl ketone that you saw enolize stereoselectively above only the ds-enolate can form. The enolate reacts highly syn selectively with... 

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