期刊
CHEMCATCHEM
卷 4, 期 9, 页码 1405-1410出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201200039
关键词
cycloaddition; homogeneous catalysis; molybdenum; vanadium; quinones
Acid-catalyzed condensation of 1,3-butadiene with para-quinones and oxidation of resulting adducts can be performed as a one-pot process in the presence of aqueous solutions of Mo-V-phosphoric heteropoly acids (HPA) with the general formula HaPzMoyVxOb. These solutions have bifunctional catalytic properties; they are both strong Bronsted acids and reversible oxidants. Condensation of hydroquinone, 1,4-benzoquinone, or 1,4-naphthoquinone with 1,3-butadiene in the HPA solutions results in 9,10-anthraquinone (AQ) in a mixture with tetrahydro-AQ (THA) and dihydro-AQ (DHA). In this one-pot process, which proceeds in the absence of organic solvents, the HPA solution is reduced. A slightly soluble mixture of THA, DHA, and AQ is precipitated and filtered off. The non-Keggin-type H12P3Mo18V7O85 solution is the most effective in this process. This solution can be rapidly regenerated by dioxygen or air at temperatures of up to 170?degrees C and then reused. The prepared THA+DHA+AQ mixture can be used as a catalyst for alkaline delignification of wood. Our homogeneous bifunctional HPA catalyst is very stable and promising for use in similar one-pot processes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据