Key points are not available for this paper at this time.
One step beyond: Proton transfer (step 3, see scheme), not CC bond formation (step 2) as previously thought, is the rate-limiting step (RLS) in the initial stage of the Baylis–Hillman reaction, which involves the amine-catalyzed addition of an aldehyde to an activated alkene to generate an allylic alcohol. This finding has considerable implications for asymmetric catalysis of the reaction.
Aggarwal et al. (Thu,) studied this question.