Answers are grounded in this paper and cite their sources.
The tandem Michael-aldol reaction of 1-[2-(methylsulfanyl)-phenyl]prop-2-en-1-one (1) or the seleno congener 4 with p-nitrobenzaldehyde in the presence of BF3.Et2O gave the Baylis-Hillman adduct 2 or 5 and onium salt 3 or 6, respectively, and selenochromanone 7 from 4.
No takes yet. Share an insight, caveat, or question.
Kataoka et al. (2001) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: