摘要：

Sc(OTf)₃ is a new type of a Lewis acid that is different from typical Lewis acids such as AlCl₃, BF₃, SnCl₄, etc. While most Lewis acids are decomposed or deactivated in the presence of water, Sc(OTf)₃ is stable and works as a Lewis acid in water solutions. Many nitrogen-containing compounds such as imines and hydrazones are also successfully activated by using a small amount of Sc(OTf)₃ in both organic and aqueous solvents. In addition, Sc(OTf)₃ can be recovered after reactions are completed and can be reused. While lanthanide triflates [Ln(OTf)₃] have similar properties, the catalytic activity of Sc(OTf)₃ is higher than that of Ln(OTf)₃ in several cases.

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