Research Article
An Eco-Friendly Improved Protocol for the Synthesis of Bis(3-indolyl)methanes Using Poly(4-vinylpyridinium)hydrogen Sulfate as Efficient, Heterogeneous, and Recyclable Solid Acid Catalyst
Table 1
Optimizing the reaction conditionsa.
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Reaction conditions: indole (2 mmol) and benzaldehyde (1 mmol), grinding at RT. Isolated yields of the product 3a. |