Eco-friendly synthesis and study of new plant growth promoters: 3,3′-Diindolylmethane and its derivatives

3,3′-Diindolylmethane (DIM) derivatives 3a–k, prepared in one-pot from indoles 1a–k and hexamethylenetetramine (2) using ionic liquid [Bmim]BF4 as eco-friendly recyclable solvent as well as catalyst, showed good plant growth promoting activity on Oryza sativa. Among the DIM derivatives synthesized 3c shows potent auxin like growth promoting activity.

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