酸性体系V催化木质素β-O-4模型物C—C键高选择性切断
发布时间:2019-01-30 12:47
【摘要】:研究了酸性体系下NH_4VO_3催化木质素模型物2-(苯氧基)-1-苯乙酮(1a)的C—C键氧化切断过程.通过优选反应溶剂,在温和条件下(100℃,101 kPaO_2)于DMSO-HOAc(V∶V=3∶1)溶剂中高选择性地得到了苯甲酸和苯酚(产率分别为82.1%和88.1%),并通过对反应过程的监测和催化剂的研究提出了该反应可能的反应路径.反应过程存在两条可能的途径,一是1a先发生C—O键断裂生成苯酚和2-羟基苯乙酮,再催化2-羟基苯乙酮C—C键氧化断裂生成苯甲酸;二是1a直接发生C—C键氧化断裂生成苯甲酸和苯酚.同时,催化剂表征结果表明,+5价钒氧离子是催化活性物种.钒催化剂在反应过程中通过+4和+5价循环完成催化过程.
[Abstract]:The C-C bond oxidation cutting process of lignin model 2- (phenoxy) -1-acetophenone (1a) catalyzed by NH_4VO_3 in acid system was studied. Benzoic acid and phenol were highly selectively obtained in DMSO-HOAc (V:V=3:1) solvent under mild conditions (100 鈩,
本文编号:2418145
[Abstract]:The C-C bond oxidation cutting process of lignin model 2- (phenoxy) -1-acetophenone (1a) catalyzed by NH_4VO_3 in acid system was studied. Benzoic acid and phenol were highly selectively obtained in DMSO-HOAc (V:V=3:1) solvent under mild conditions (100 鈩,
本文编号:2418145
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