Zirconocene mediated acetylboron chemistry

Area of Science:

• Organometallic Chemistry
• Boron Chemistry
• Zirconium Chemistry

Background:

• Zirconocene complexes are versatile reagents in organic synthesis.
• Reactions involving organoboranes and carbon monoxide are crucial for developing new catalytic processes.
• Understanding the reactivity of metal-boron bonds is key to advancing inorganic chemistry.

Purpose of the Study:

• To investigate the reactivity of methyl and hydrido zirconocene complexes with a specific organoborane.
• To characterize the resulting acetylborate and borata-β-lactone zirconocene products.
• To explore the influence of carbon monoxide on these organometallic transformations.

Main Methods:

• Synthesis and characterization of zirconocene complexes.
• Reactions with tris(pentafluorophenyl)borane and carbon monoxide.
• Spectroscopic analysis (NMR, X-ray crystallography) of reaction products.

Main Results:

• Methyl zirconocene reacted with H3C-B(C6F5)2 and CO to yield an acetyl(methyl)borate Zr complex.
• Hydrido zirconocene yielded an acetyl(hydrido)borate Zr product, with a minor formyl(methyl)borate isomer.
• Further reaction with CO led to the formation of a borata-β-lactone zirconocene product.

Conclusions:

• Zirconocene complexes can be effectively functionalized with organoboranes and carbon monoxide.
• The study demonstrates a novel pathway to borata-β-lactone structures.
• These findings expand the scope of organometallic reactivity for zirconium and boron.