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Thermal studies of hypervalent iodine reagents

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Abstract

The thermal properties of hypervalent iodine reagents (iodobenzene diacetate, bis(trifluoroacetoxy)iodobenzene, [hydroxyl(mesyloxy)]iodobenzene, [hydroxy(tosyloxy)] iodobenzene) and polymer-supported hypervalent iodine reagents (polystyrene-supported iodobenzene diacetate, polystyrene-supported bis(trifluoroacetoxy)iodobenzene, polystyrene-supported[hydroxyl(mesyloxy)]iodobenzene, polystyrene-supported [hydroxy(tosyloxy)] iodobenzene) were investigated using thermogravimetry (TG) and differential scanning calorimetry (DSC). The polystyrene-supported iodobenzene diacetate, synthesized from polystyrene, was a precursor to other three polymer-supported hypervalent iodine reagents (PS-HTIB, PS-HMIB and PS-BTI). The TG curves of hypervalent iodine reagents and their polymer analogues show mainly one-step mass loss behaviour, whereas enthalpy change (∆H) and onset temperature were calculated from a DSC curve which that shows hypervalent iodine reagents and their polymer analogues decompose endothermically. The results suggest that the polymer-supported hypervalent iodine reagents are more stable than hypervalent iodine reagents and therefore may be used in reactions without decomposition up to 350–410 °C in comparison to the polymer-supported hypervalent iodine reagents that are stable up to 132–160 °C.

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Acknowledgements

We gratefully acknowledge UGC, New Delhi, for financial support. We are highly thankful to Prof. Thomas M. Klapötke, Chair of Inorganic Chemistry, Ludwig-Maximilian University of Munich, Germany, for support and suggestions.

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Authors and Affiliations

  1. Department of Chemistry, Guru Jambheshwar University of Science & Technology, Hisar, 125001, Haryana, India

    Vikas Verma, Kuldeep Singh, Ashok Kumar & Devinder Kumar

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  1. Vikas Verma
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  2. Kuldeep Singh
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Correspondence to Devinder Kumar.

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Verma, V., Singh, K., Kumar, A. et al. Thermal studies of hypervalent iodine reagents. J Therm Anal Calorim 114, 339–344 (2013). https://doi.org/10.1007/s10973-012-2894-1

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