In creating the kinetic product, that being the product with the lower energy transition state and the higher energy product, of a silyl enolate it is required that a bulky base is used to deprotonate the alpha position of the carbonyl. In this case, the most popular base used is the Hunig's base, or otherwise known as N,N-Diisopropulethylamine, which quickly and irriversibly creates the enolate that in turn attacks a silyl triflate (here being TMS triflate).
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