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The reaction of pentoses with oxygen in dilute aqueous potassium hydroxide at 25.00 ± 0.05° has been studied by determining the initial rate of oxygen uptake and the rate of disappearance of reducing sugar. Pentose reactivity decreased through the series: D-xylose (2.0), D-ribose (1.4), L-arabinose (1.2), D-lyxose (1.0). The products formed were identified by paper chromatography, isolation, and n.m.r. spectroscopy. In all cases less than one molar equivalent of tetronic acid is produced. The results are discussed with reference to recent studies on the behavior of sugars in alkaline solution. The reaction of pentoses with oxygen in 0.5 M sodium carbonate at 25.00 ± 0.05° was also studied. The order of pentose reactivity in this system was changed to D-ribose (5.7), D-lyxose (2.2), D-xylose (1.9), L-arabinose (1.0).
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Gleason et al. (1971) studied this question.
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