H. Weenen, J. V. D. Ven, L. M. V. D. Linde, J. Duynhoven, A. Groenewegen
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C4, C5, and C6 3-Deoxyglycosones: Structures and Reactivity
Summary Because of the importance of deoxyglycosones as reactive intermediates in the Maillard reaction, C4, C5 and C6 3-deoxyglycosones were prepared, their structures were elucidated, and their reactivity studied. Whereas 3-deoxyglucosone consists exclusively of bicyclic (hemi)acetal/(hemi)ketal structures, 3-deoxypentosone consists of monocyclic isomers with 63% hydrates (gem-diols) present; 3-deoxytetrosone was found to occur as monocyclic and non-cyclic hydrates, with a free carbonyl present in 27% of the isomers. The reactivity (instability and browning) is in the order 3-deoxytetrosone > 3-deoxypentosone > 3-deoxyglucosone.
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