Tools and techniques for solution‐phase structural understanding of SmI 2 –additive complexes

SmI 2 is a versatile reducing agent for organic synthesis. Additive‐induced tailoring of reaction mechanisms and products is one of the most promising aspects of this multifaceted reagent. In most instances, additives form a coordination complex with SmI 2 . Insight on the solution‐phase structure of SmI 2 in the presence of additives is significant to decipher possible reaction mechanisms and predict reactivity of SmI 2 in the presence of an entirely new additive. A series of experimental and computational tools are used to unravel the solution‐phase structure of SmI 2 –additive complex. This review aims to provide a comprehensive overview of how different analytic tools are employed, and data are analyzed to arrive at a possible solution‐phase structure of SmI 2 –additive complex. Understanding of SmI 2 –additive solution‐phase structure in predicting SmI 2 reactivity and plausible reaction mechanism is also discussed.