Publication: Earth Abundant Manganese Catalysed Sustainable Chemical Transformations
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Date
2025
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Indian Institute of Technology, Jodhpur
Abstract
The growing interest in Earth-abundant transition metals for organometallic catalysis stems from their economic advantages, availability, and unique catalytic properties. Manganese, the third most abundant transition metal in the Earth's crust, has emerged as a promising alternative to precious metals such as platinum, palladium, and rhodium, which are commonly used in catalytic processes like (de)hydrogenation, hydroboration, hydrosilylation. While precious metal catalysts are renowned for their high activity and robustness, their high cost and limited availability pose significant challenges. In contrast, manganese offers a more sustainable and cost-effective option, though it often requires more advanced catalyst design to match the performance of precious metal-based systems. Manganese catalysts are typically designed around three key principles: metal–ligand bifunctionality, ligand hemi-lability, and redox activity. By optimizing these factors, manganese catalysts can be engineered to achieve competitive turnover numbers, although they may not always match the efficiency of precious metals in certain applications. This thesis provides a comprehensive analysis of the catalytic properties of manganese complexes, comparing their activity, versatility, and efficiency in the direction of alkylation, (de)hydrogenation, deamination and hydration reactions. It also highlights the critical challenges in manganese catalyst design, particularly in ligand optimization, and offers insights into how these catalysts can be improved for broader catalytic applications.
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Sachin (2020)Earth Abundant Manganese Catalysed Sustainable Chemical Transformations (Doctor's thesis). Indian Institute of Technology Jodhpur