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Updated: Jul 31, 2025

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
9-(Pyrrolidinium-1-yl)-9-boranuidabi-cyclo-[3.3.1]nona-ne
1Institut für Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599 Freiberg, Germany.
Abstract:
The title compound, C12H24BN, is an adduct formed from 9-borabi-cyclo-[3.3.1]nonane (9-BBN) and pyrrolidine. It crystallizes in the triclinic space group P with three mol-ecules in the asymmetric unit, one of which has disorder of the pyrrolidine ring. The B-N bond lengths are between 1.631 (2) and 1.641 (2) Å. The boron and nitro-gen atoms are bound to one hydrogen atom each. These hydrogen atoms are in anti-periplanar orientation. Both six-membered rings of the 9-BBN unit are in a chair conformation in all three mol-ecules. Differences between the three crystallographic independent mol-ecules are found in the five-membered rings of the pyrrolidine unit. These adopt different twisted and envelope conformations.
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