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Caffeine-H2SO4: a novel dual acidic catalyst for one-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones

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Abstract

Caffeine-H2SO4 was prepared as a novel dual acidic catalyst. The catalytic activity of caffeine-H2SO4 was evaluated in one-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones. The catalyst was also characterized by Fourier-transform infrared (FT-IR) and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy and thermogravimetric analysis (TGA). According to the obtained results including reaction time, yield, and recyclability, caffeine-H2SO4 can be considered an efficient catalyst for organic transformations.

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One-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones

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Acknowledgements

We gratefully acknowledge the support of this work by Production Technology Research Institute of ACECR Research Council.

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Authors and Affiliations

  1. ACECR-Production Technology Research Institute, Ahvaz, Iran

    Seyyed Jafar Saghanezhad

  2. Department of Chemistry, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran

    Soheil Sayyahi

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  1. Seyyed Jafar Saghanezhad
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  2. Soheil Sayyahi
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Correspondence to Seyyed Jafar Saghanezhad.

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Saghanezhad, S.J., Sayyahi, S. Caffeine-H2SO4: a novel dual acidic catalyst for one-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones. Res Chem Intermed 43, 2491–2500 (2017). https://doi.org/10.1007/s11164-016-2775-5

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