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Application of the Lewis acidity parameters LA B in borane‐catalyzed reactions: a) Nazarov cyclizations; borane 1 g (with ortho‐fluorine atoms) is a less efficient catalyst than the equally Lewis acidic 1 h (with only ortho‐hydrogen atoms). b) Diels–Alder reactions of methyl vinyl ketone with cyclopentadiene. c) Michael additions of 1‐methylindole to methyl vinyl ketone (ref. [32] reports catalysis of this Michael addition by 5 mol % 1 i in CHCl3 at 80 °C).
