N-Heterocyclic carbene boryl anion

[3] These characteristics make NHC boryl anions key ligands in many applications, such as polycyclic aromatic hydrocarbons, and more commonly low oxidation state main group element bonding.

[1] This reaction made a boryllithium complex, where the boron atom shows strong structural similarity to a free boryl anion.

What is formed is a borylpotassium dimer, in which the K+ ions interact weakly with both the carbons on the substituents on the nitrogens and also the boron centers.

The B-Mg bonds are slightly longer than the sum of the covalent radii, but this has been attributed to weakened Coulombic interaction due to coordination of the solvent, which was THF in this experiment.

[11] This solvent interaction also affects the geometry of the molecule, as the crystal structure shows that the Mg atom has a distorted sp3-hybridized center.

[12] Although the mechanism of this reaction is unclear, it is believed that one of the backbone protons becomes deprotonated, allowing the Be to bind to the positively charged carbons.

For this synthesis, an extra boron atom was added to the NHC boryl anion, and then was reduced, forcing dimerization between the molecules and allowing for a H-bridged tetraborane species to occur.

Additionally, the NPA charges on the central B-B moiety are negative, showing that the boryl anions donate electron density, leading to the conclusion that a B=B double bond is occurring.

[15] To make a Si-Si single bond, a NHC boryl silane compound is reduced by KC8 in DME solvent.

[16] Two equivalents of a NHC boryl silane compound is reduced with Mg in THF, leading to a Mg-Si-Si three-membered ring.

[22] It has been shown that replacing the end carbons with a B-N moiety expands the family of PAHs and can serve as functional materials.

[23] Placing boron into PAHs is known to improve and diversity the optoelectronic properties by reducing the LUMO energy level.

The fused NHC boryl anion units add an element of bifunctionality and induce π-conjugation because of the empty pz orbital.