“…Seven 11 B signals appeared at δ =21.1, 8.6, 4.3, 0.2, −11.9, −12.9, and −16.1 ppm, in addition to signals due to HBpin ( δ =27.9 ppm), 2 a ( δ =23.6 ppm), and KBH 4 ( δ =−39.2 ppm; see the Supporting Information). Among them, three peaks in the lowest fields were assigned to pinBO t ‐Bu, KH 2 Bpin, and KO t ‐Bu⋅HBpin, respectively (vide supra) . A small signal at δ =0.2 ppm splits into a triplet ( 1 J BH =102 Hz), attributable to a 1,4‐dihydropyridylborane dimer ( A ) .…”