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Issue 7, 2016
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Basicity and stability of urea deep eutectic mixtures

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The stability and basicity origin of some common urea based deep eutectic mixtures/solvents (DES) were studied. We have observed an unexpected Hantzsch dihydropyridine reaction in sorbitol/urea DES, where the source of ammonia was found not to be originated from the individual ingredients of the DES. Our results showed that decomposition of urea occurs in DES at lower than expected temperatures, namely below 100 °C and is enhanced in diol DES by the formation of carbonates causing their unexplained basicity. Carbohydrates and choline chloride (ChCl) DES exhibit lower rates of decomposition, while no decomposition was observed from neat urea or MeOH and EtOH urea solutions.

Graphical abstract: Basicity and stability of urea deep eutectic mixtures

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The article was received on 19 Nov 2015, accepted on 24 Dec 2015 and first published on 05 Jan 2016

Article type: Paper
DOI: 10.1039/C5RA24558C
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Citation: RSC Adv., 2016,6, 5485-5490

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    Basicity and stability of urea deep eutectic mixtures

    S. P. Simeonov and C. A. M. Afonso, RSC Adv., 2016, 6, 5485
    DOI: 10.1039/C5RA24558C

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