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首页> 外文期刊>Journal of Wood Chemistry and Technology >Investigation on the Hydrogen Abstraction from Methyl Glucoside by Active Oxygen Species under Oxygen Delignification Conditions. Part 2: Study on the C-2 Position
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Investigation on the Hydrogen Abstraction from Methyl Glucoside by Active Oxygen Species under Oxygen Delignification Conditions. Part 2: Study on the C-2 Position

机译：氧去木质素条件下活性氧从甲基葡糖苷提取氢的研究。第2部分：C-2位置研究

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摘要

It was investigated whether active oxygen species (AOS) generated in situ by reacting a phenolic compound, 2,4,6-trimethylphenol, with O_2 abstract the C-2 hydrogen from a carbohydrate model compound, methyl β-D-glucopyranoside (MGPβ), under conditions simulating oxygen delignification (0.5 mol/l NaOH, 0.36 mmol/l FeCl_3, 1.1 Mpa O_2, 95℃). MGPβ was degraded less than methyl P-D-mannopyranoside (MMPβ) when they were reacted together with AOS. It was suggested that the con-figurational difference at their C-2 positions results in their different reactivity toward AOS. When MGPβ and methyl P-D-(2-~2H)glucopyranoside (MGPβ -2D) were reacted together with AOS, MGPβ was degraded slightly but more than MGPβ-2D, which clearly indicates that the C-2 hydrogen of MGPβ is abstracted by AOS. MGPβ and MGPβ-2D were also subjected together to alkaline H_2O_2 treatment (0.5 mol/l NaOH, 0.36 mrnol/l FeCl_3, 58.8 mmol/l H_2O_2, 95℃) in which oxyl anion radical (O-●) is likely the only AOS to degrade these compounds. At least some AOS other than O-● abstract the C-2 hydrogen from MGPβ in the aforementioned oxygen-alkali treatments.
机译：研究了是否通过使酚类化合物2,4,6-三甲基苯酚与O_2反应原位生成活性氧（AOS），该活性氧是从碳水化合物模型化合物甲基β-D-吡喃葡萄糖苷（MGPβ）中提取C-2氢在模拟氧去木质素的条件下（0.5 mol / l NaOH，0.36 mmol / l FeCl_3、1.1 Mpa O_2、95℃）。当它们与AOS一起反应时，MGPβ的降解程度低于甲基P-D-甘露吡喃糖苷（MMPβ）。有人认为，它们在C-2位置的构型差异导致它们对AOS的反应性不同。当MGPβ和甲基PD-（2-〜2H）吡喃葡萄糖苷（MGPβ-2D）与AOS一起反应时，MGPβ的降解程度比MGPβ-2D稍高，但降解程度更大，这清楚地表明AGP提取了MGPβ的C-2氢。 MGPβ和MGPβ-2D也一起进行了碱性H_2O_2处理（0.5 mol / l NaOH，0.36 mrnol / l FeCl_3、58.8 mmol / l H_2O_2、95℃），其中氧阴离子基团（O-●）可能是唯一的AOS降解这些化合物。在上述氧碱处理中，除O-●以外，至少还有一些AOS从MGPβ中提取C-2氢。

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