Crystal structure of bis-(mesit-yl)(pyrrol-1-yl)borane.

In the crystal structure of the title compound, C(22)H(26)BN, the B atom acts to reduce the delocalization of the nitro-gen lone-pair electron density into the pyrrole ring, so that the two N-C bonds increase in length to 1.4005†(14) and 1.3981†(14)†à . The N-B bond length is 1.4425†(15)†à , which is longer than a typical N-B bond because the nitro-gen lone pair is not fully available to participate in the bond.