Carbon-Nitrogen Bond Cleavage by a Thorium-NHC-bpy Complex

Area of Science:

• Organometallic Chemistry
• Actinide Chemistry
• Small Molecule Activation

Background:

• Actinide complexes exhibit unique reactivity with small molecules, but controlling this reactivity is difficult.
• Developing predictable and controllable actinide systems is crucial for harnessing their chemical potential.

Purpose of the Study:

• To describe a novel bis(NHC)borate thorium-bis(pyridyl) complex for controlled small molecule transformations.
• To investigate the reductive cleavage of the R-NC bond in organic isocyanides mediated by this thorium complex.

Main Methods:

• Synthesis of a bis(NHC)borate thorium-bpy complex.
• Reaction of the thorium complex with various organic isocyanides.
• Characterization of reaction products to elucidate the mechanism.

Main Results:

• The thorium complex successfully mediated the reductive cleavage of the R-NC bond in a range of isocyanides.
• The reaction demonstrated remarkable generality and produced well-defined products.
• A rearranged product from cyclopropylmethyl isocyanide supported a radical-based mechanism.

Conclusions:

• The described thorium complex provides a controllable system for actinide-mediated bond activation.
• The findings offer insights into the mechanism of isocyanide dealkylation, suggesting a radical pathway.
• This work advances the field of actinide chemistry and small molecule activation.