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The title compound, C25H31BF2N2O, is a potential boron tracedrug in boron neutron capture therapy (BNCT), in which the B atom adopts a distorted BN2F2 tetra-hedral geometry: it is soluble in dimethyl sulfoxide, di-methyl-formamide and methanol. The pyrrolyl-idene-methyl-pyrrole triple fused ring system is almost planar (r.m.s. deviation = 0.031 Å) and subtends a dihedral angle of 47.09 (5)° with the plane of the pendant phenol ring. The phenol -OH group is blocked from forming hydrogen bonds by the adjacent bulky tert-butyl groups. In the crystal, inversion dimers linked by pairs of very weak C-H⋯F inter-actions generate R 2 (2)(22) loops.

acta crystallographica. section e, crystallographic communications

Crystal structure of (2-{[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl](5-methyl-2H-pyrrol-2-ylidene)methyl}-5-methyl-1H-pyrrolido-κ2N,N′)difluoridoboron