The title compound, C20H24BNO2, has a polarized π-system due to significant resonance between the N-C(H)=C(H)-B and ionic N+=C(H)-C(H)=B- canonical forms. The dihedral angles between the NC2B plane (r.m.s. deviation 0.0223 Å) and the C3N (r.m.s. deviation 0.... ...