Related Experiment Video
Updated: Jan 11, 2026

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
All-boron analogue of planar benzene on an osmium template
Ketaki Kar1, Gaurav Joshi2, Eluvathingal D Jemmis2
1Department of Chemistry, Indian Institute of Technology Madras Chennai 600036 India sghosh@iitm.ac.in.
Abstract:
The synthesis of the planar hexaborane B6 ring remains a long-standing and elusive ambition in boron chemistry, defying boron's intrinsic electron deficiency that drives it to favour polyhedral three-dimensional geometries rather than chains and rings. Owing to this domination, earlier attempts to stabilize the planar B6 ring in a monometallic template encountered no success. Herein, we report the synthesis and structure of bis-nido-[Cp*Os(η 6-B6H11)] (Cp* = η 5-C5Me5) (1), the first planar [B6H11] ring stabilized by the monometallic late transition metal (TM) fragment [Cp*Os]. The fluxionality due to rapid exchange between the bridging hydrogens in 1 led to considerable structural intrigue, resembling the dynamic behaviour seen in nido-[B6H10]. Furthermore, we have successfully isolated the intermediate boron chains, nido-arachno-[Cp*Os(η 5-B5H12) (2) and nido-arachno-[Cp*Os(η 4-B4H9) (3). The B5 chain in 2 and the B4 chain in 3 are isoelectronic with the pentadienyl radical (C5H7) and the 1,3-butadiene radical cation (C4H6)+, respectively. Extensive multicenter bonding interactions are demonstrated to stabilize the unique flat ring, as well as the boron chains within monocapped scaffolds.
More Related Videos
08:56Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
Published on: November 30, 2022
04:51Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
Published on: June 23, 2023
Related Concept Videos
Structure of Benzene: Molecular Orbital Model
Hydroboration-Oxidation of Alkenes
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene
Hybridization of Atomic Orbitals I
Molecular Orbital Theory II
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide