Intra- and Intermolecular H/D Exchange in Aqueous Solution Catalyzed by Molybdocenes

Area of Science:

• Organometallic Chemistry
• Catalysis
• Green Chemistry

Background:

• C-H bond activation is a fundamental transformation in chemistry.
• Developing catalysts that operate in water is crucial for sustainable chemistry.
• Molybdocene complexes offer unique electronic and steric properties for catalysis.

Purpose of the Study:

• To investigate C-H bond activation in water using water-soluble molybdocene complexes.
• To explore the H/D exchange reaction in alcohols catalyzed by these complexes.
• To understand the mechanism of deuterium incorporation.

Main Methods:

• Synthesis of water-soluble molybdocene complexes.
• Performing H/D exchange reactions in the presence of deuterated water and alcohols.
• Characterization of products using spectroscopic techniques (e.g., NMR).

Main Results:

• Successful C-H bond activation and H/D exchange in alcohols were achieved in water.
• Deuterium incorporation was observed both intramolecularly in the molybdocene Cp' methyl group and intermolecularly on the alcohol alpha-carbon.
• The catalytic system operates effectively at moderate temperatures.

Conclusions:

• Water-soluble molybdocene complexes are effective catalysts for C-H activation and H/D exchange in alcohols in aqueous media.
• The reaction proceeds via a mechanism involving both intramolecular and intermolecular deuterium transfer.
• This work demonstrates the potential of molybdocene catalysts for sustainable chemical transformations in water.