Fig. 2. Michael acceptors studied in this work (blue) or previously (ref. 25 and 27), ranked according to their electrophilicity parameters E and combined with a reactivity scale for C-centered nucleophiles (ordered by their N parameters, reactivity given as N/sN). aEstimated N/sN based on reactivity data for the carbanion derived from 2-phenylpropionitrile (ref. 24d).
