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在选择性氧化的研究中,Cr(Ⅵ)类选择性氧化剂都存在着需特殊制备、配体和溶剂昂贵等缺点。同时,相转移催化技术的使用,也使许多氧化剂有了较好的选择性,但对环境污染严重。间接电氧化虽没有用量大、污染严重的缺点,但没有选择性。为此,我们使用间接电氧化和相转移催化氧化联用的方法,克服了上述缺点。并用Cr(Ⅵ)/Cr(Ⅲ)为间接氧化还原体系对醇类的选择性氧化进行了探讨。结果发现,本实验条件下,苄醇类会选择性地氧化成相应的羰基化合物,且产率高,而非苄醇类的醇则达不到此目的。
In the study of selective oxidation, Cr (Ⅵ) selective oxidants have the disadvantages of special preparation, expensive ligands and solvents. At the same time, the use of phase transfer catalysis also makes many oxidants more selective, but has serious environmental pollution. Indirect electro-oxidation, although not a large amount of pollution, shortcomings, but no selectivity. To this end, we use indirect electroxidation and phase transfer catalytic oxidation method, to overcome the above shortcomings. The selective oxidation of alcohols with Cr (Ⅵ) / Cr (Ⅲ) as an indirect oxidation-reduction system was also discussed. The results showed that, under the experimental conditions, benzyl alcohol will be selectively oxidized to the corresponding carbonyl compounds, and the yield is high, but non-benzyl alcohol alcohol can not achieve this goal.