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A set of bis- and tris(indolyl)methanes were prepared and dehydrogenated to   their hyperconjugated products in a one-pot fashion. Nano-sized-SO3H   functionalized mesoporous KIT-6 coated on magnetite nanoparticles   (Fe3O4@SiO2@KIT-6-OSO3H) was used as an efficient catalyst in the first step   of synthesis, and dehydrogenation was performed by using (NH4)2S2O8 after   removal of the catalyst. The catalyst was fully characterized by Fourier   transform infrared spectroscopy (FT-IR), transmission electron microscopy   (TEM) and X-ray powder diffraction (XRD), as well as nitrogen   adsorption-desorption isotherms. The bis- and tris(indolyl)methanes were   studied by UV-Vis spectroscopy before and after dehydrogenation, and effect   of the ambient parameters on their spectra was investigated. It was found   that bis- and tris(indolyl)methanes have no considerable absorption in the   visible range and what makes them colorful is partial dehydrogenation due to   exposure to air. Our catalyst as a new combination of known materials, showed   superiority in terms of yield, time, and mild reaction conditions in   comparison with previous reports

Synthesis of bis- and tris(indolyl)methanes catalyzed by an inorganic nano-sized catalyst followed by dehydrogenation to hyperconjugated products