Revealing the Activity of π‐Acid Catalysts using a 7‐Alkynyl Cycloheptatriene
2017
A compound that isomerizes into distinct products depending on the particular Lewis acid or Bronsted acid catalyst used is disclosed. One product can only be obtained with the softest π-acids, such as Au, Pt, Ga, or In complexes. Another is formed only with harder π-acids incorporating Ag or Cu salts. The formation of the third category requires even harder π-acids or protons. This simple benchmark reaction allows for prediction of the category of transformations that can be catalyzed by a new complex. It also informs whether protons have been unintentionally generated in the reaction mixture.
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