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A N-B bond between a pyrrole N atom to a dimesityl-boron group.
What is it about?
In a pyrrole the nitrogen lone pair belongs to the aromatic pi system, while for a standard N-B bond the lone pair will donate into the empty boron p orbital. In our case the lone pair has both options. The bond lengths suggest that there is a reduction in both aspects.
Why is it important?
It was interesting to see how the boron affected the aromatic system of the pyrrole ring. The N-C bonds are lengthened compared to pyrrole, while the N-B is longer than a standard N-B bond. The molecule is a potential component for use in conductive materials.