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[(OC)5 Cr=BSi(SiMe3 )3 ]: A Terminal Borylene Complex with an Electronically Unsaturated Boron Atom
Holger Braunschweig1, Miriam Colling2, Carsten Kollann2
1Department of Chemistry Imperial College London SW7 2AY, UK, Fax: (+44) 20-7594-5900.
Angewandte Chemie (International Ed. in English)
|May 2, 2018
Summary
Researchers synthesized a novel borylene complex, [(OC)5Cr=B-Si(SiMe3)3]. This compound features an unsaturated boron atom, confirmed by low-field 11B NMR and a short chromium-boron distance, marking a significant advancement in boron chemistry.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
- Boron Chemistry
Background:
- Borylene complexes, characterized by a dicoordinate boron atom, are crucial intermediates in organoboron chemistry.
- Understanding the electronic and coordination environment of boron is key to developing new catalytic and materials applications.
Purpose of the Study:
- To synthesize and characterize a novel borylene complex with a coordinatively and electronically unsaturated boron center.
- To investigate the structural and electronic properties of the title compound, [(OC)5Cr=B-Si(SiMe3)3].
Main Methods:
- Synthesis of the title borylene complex.
- Characterization using 11B Nuclear Magnetic Resonance (NMR) spectroscopy.
- Determination of the chromium-boron (Cr-B) bond distance via X-ray crystallography.
Main Results:
- The synthesized compound, [(OC)5Cr=B-Si(SiMe3)3], exhibits an extremely low-field shifted 11B NMR signal at δ=204.3 ppm.
- A very short Cr-B bond distance of 187.8 pm was determined, indicating significant metal-boron interaction.
- The boron atom in this complex is both coordinatively and electronically unsaturated.
Conclusions:
- The title compound represents the first characterized borylene complex featuring a coordinatively and electronically unsaturated boron atom.
- The observed NMR shift and short Cr-B distance provide strong evidence for the unique electronic structure of this borylene complex.
- This discovery opens new avenues for exploring the reactivity and applications of unsaturated boron compounds in catalysis and synthesis.
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