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The title compound, C 20 H 22 BNO 2 , has a polarized π-system due to resonance between N—C(H)=C(H)—B and ionic N + =C(H)—C(H)=B −  canonical structures. The dihedral angles between the ethenyl plane (r.m.s. deviation for C 2 H 2  = 0.0333 Å) with the ethenyl- C (NC 2 -pyrrole) plane (r.m.s. deviation CNC 2  0.0423 Å) and the ethenyl-C(BO 2 -1,3,2-dioxaborolane) plane (r.m.s. deviation BCO 2  0.0082 Å) are 45.86 (8) and 37.47 (8)°, respectively, and are greater than those found for the previously reported  E -isomer [Hatayama &amp; Okuno (2012)  Acta Cryst.  E 68 , o84]. In comparison with the  E -isomer, the reduced planarity of  Z -isomer results in a decrease of the contribution of the N + =C(H)—C(H)=B −  canonical structure.

9-[(Z)-2-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)ethenyl]-9H-carbazole