我们在这里报告了由水热途径中的阳离子表面活性剂CTAB介导的CuCr 2 O 4尖晶石纳米颗粒催化剂的制备。X射线衍射显示形成了CuCr 2 O 4尖晶石相,而透射电镜显示其粒径为30-60 nm。推测该催化剂对于用H 2 O 2将环己烷选择性氧化为环己酮具有高活性。在50℃的温度下,在该催化剂上实现了70%的环己烷转化率和85%的环己酮选择性。而且,即使再使用8次,该催化剂也没有表现出任何明显的活性损失,并证明了其在氧化其他环烷烃中的功效。
Copper-Catalyzed Oxidation of Alkanes with H<sub>2</sub>
O<sub>2</sub>
under a Fenton-like Regime
作者:Isaac Garcia-Bosch、Maxime A. Siegler
DOI:10.1002/anie.201607216
日期:2016.10.4
Copper complexes bearing readily available ligand systems catalyzed the oxidation of alkanes with H2O2 as the oxidant with high efficiency in remarkable yields (50–60 %). The reactions proceeded with unprecedented selectivity to give alkyl hydroperoxides as the major products. Detailed scrutiny of the reaction mechanism suggests the involvement of C‐centered and O‐centered radicals generated in a Fenton‐like
带有容易获得的配体体系的铜络合物以H 2 O 2作为氧化剂催化烷烃的氧化,收率很高(50-60%)。反应以空前的选择性进行,得到烷基氢过氧化物作为主要产物。对反应机理的详细审查表明,涉及以Fenton样方式生成的C中心和O中心自由基。
hydroperoxides in excellent yields. The autoxidation of organoboranes is inhibited by iodine or such free-radical scavengers. A study of the inhibition by iodine of the oxidation of representative trialkylboranes indicates that the rate of initiation decreases with an increase in the steric crowding about the boron atom. The rate of inhibition of the autoxidation of trialkylboranes by iodine reveals that
Efficient oxidation of cycloalkanes with simultaneously increased conversion and selectivity using O2 catalyzed by metalloporphyrins and boosted by Zn(AcO)2: A practical strategy to inhibit the formation of aliphatic diacids
作者:Hai-Min Shen、Xiong Wang、Lei Ning、A-Bing Guo、Jin-Hui Deng、Yuan-Bin She
DOI:10.1016/j.apcata.2020.117904
日期:2021.1
The direct sources of aliphatic acids in cycloalkanesoxidation were investigated, and a strategy to suppress the formation of aliphatic acids was adopted through enhancing the catalytic transformation of oxidation intermediates cycloalkyl hydroperoxides to cycloalkanols by Zn(II) and delaying the emergence of cycloalkanones. Benefitted from the delayed formation of cycloalkanones and suppressed non-selective