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Low Melting Sugar-Urea-Salt Mixtures as Solvents for Organic Reactions - Estimation of Polarity and Use in Catalysis

Imperato, G. ; Höger, S. ; Lenoir, D. ; König, B.


Mixtures of sugars, sugar alcohols or citric acid with urea and inorganic salts form stable melts if heated to 70 °C. The polarity of the melts was estimated using solvatochromic dyes and found to be in the range of DMF or water, depending on the sensitivity of the dye for hydrogen bonds. To explore the use of the melts as solvents in catalysis, Rh-catalyzed hydrogenations and Pd-catalyzed Suzuki ...


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