Green Catalysis with Organometallic Complexes: Mechanistic Insights and Industrial Perspectives

Green catalysis utilizing organometallic complexes represents a cornerstone of modern
sustainable chemistry, offering significant advancements in environmentally friendly
and resource-efficient chemical transformations. This review presents a comprehensive
analysis of the mechanistic principles, catalytic performance, and industrial relevance of
organometallic catalysts in green chemistry. Beginning with an overview of the role and
importance of green catalysis, the discussion progresses to the classification, ligand
design, and performance attributes, such as stability, selectivity, and tunability of
organometallic complexes. Key mechanistic pathways, including oxidative addition,
reductive elimination, insertion, and metal-ligand cooperation, are explored in detail,
supported by insights from computational and spectroscopic studies. This review
further highlights the application of these complexes in essential green transformations,
including C–C coupling reactions, hydrogenation, hydrofunctionalization, and CO₂
utilization. Real-world industrial applications are examined through case studies in
pharmaceuticals, polymer synthesis, and renewable feedstock conversion, illustrating
both the potential and limitations of these catalysts at scale. Additionally, sustainability
metrics such as the E-factor, turnover number, and green chemistry indicators are
employed to assess the environmental and economic impacts. The review concludes
with an exploration of ongoing challenges, such as catalyst deactivation, and discusses
future directions involving renewable energy integration, catalyst design innovation,
and the incorporation of artificial intelligence and machine learning for accelerated
discovery. Collectively, this work underscores the pivotal role of organometallic
catalysis in advancing green chemistry from mechanistic understanding to industrial
implementation.