New general synthesis of α-alkoxyketones via α′-alkylation, α-alkylation and α,α′-dialkylation of α-alkoxyketimines
作者:Filip Colpaert、Sven Mangelinckx、Maria Teresa Rocchetti、Norbert De Kimpe
DOI:10.1039/c0ob00662a
日期:——
important intermediates in organic synthesis and flavor compounds in food chemistry, were synthesized by deprotonation of N-(1-alkoxy-2-propylidene)isopropylamine, prepared by condensation of the corresponding α-alkoxyacetone with isopropylamine, and subsequent reaction of the corresponding 1-azaallylic anions with alkyl halides to afford α′-alkylated, α-alkylated and α,α′-dialkylated ketimines. Hydrolysis
Promotional synergistic effect of Sn doping into a novel bimetallic Sn-W oxides/graphene catalyst for selective oxidation of alcohols using aqueous H2O2 without additives
作者:Cai Xu、Lingling Zhang、Yu An、Xiaozhong Wang、Gang Xu、Yingqi Chen、Liyan Dai
DOI:10.1016/j.apcata.2018.03.017
日期:2018.5
catalysts with bimetallic Sn-W oxides uniformly dispersed on reduced graphene oxide (denoted as Sn-W/RGO) were successfully prepared via a conventional one-pot hydrothermal method. Interestingly, it was found that the introduction of Sn could significantly improve the catalytic activities compared with single WO3/graphene catalyst for selective oxidation of alcoholsusingH2O2 without organic solvents and
通过常规的一锅水热法成功地制备了一系列新型的双金属锡-钨氧化物均匀分布在还原的氧化石墨烯上的催化剂(称为锡-钨/ RGO)。有趣的是,发现与不使用有机溶剂和添加剂的使用H 2 O 2的醇选择性氧化的单一WO 3 /石墨烯催化剂相比,Sn的引入可以显着提高催化活性。随后,通过FT-IR,XRD,拉曼,FESEM,EDS,HRTEM,XPS和N 2对催化剂进行了表征。吸附-解吸研究锡在催化剂结构,表面性质和催化性能之间的协同增效作用。结果表明,Sn的掺入诱导了六方晶WO 3的形成。同时,以(001)和(200)面为主的掺杂,掺杂Sn可以显着增加比表面积,改变结构性质,增强Sn-W氧化物与石墨烯之间的相互作用,有利于提高催化性能。此外,还研究了反应参数(温度,时间,氧化剂用量和催化剂用量)。在催化剂上,芳基和烷基醇都显示出高转化率和对相应目标产物的选择性。令人高兴的是,该耐用型催化剂可以重复使用
Facile construction of leaf-like WO<sub>3</sub> nanoflakes decorated on g-C<sub>3</sub>N<sub>4</sub> towards efficient oxidation of alcohols under mild conditions
作者:Cai Xu、Xiaozhong Wang、Gang Xu、Yingqi Chen、Liyan Dai
DOI:10.1039/c8nj03328e
日期:——
nanoflakes decorated on g-C3N4 was constructed via a facile impregnation and subsequent annealing method. The prepared WO3/g-C3N4 exhibited excellent catalytic activity for the selective oxidation of alcoholsundermildconditions, and satisfactory yields to the corresponding carbonyl compounds were achieved without using non-green additives and organic solvents. It was found that the enhanced catalytic activity
在此,通过简便的浸渍和随后的退火方法,构建了在gC 3 N 4上装饰有叶状WO 3纳米薄片的轮廓分明的纳米结构。所制备的WO 3 / gC 3 N 4在温和条件下对醇的选择性氧化显示出优异的催化活性,并且在不使用非绿色添加剂和有机溶剂的情况下,获得了令人满意的相应羰基化合物的产率。发现提高的催化活性可以归因于扩大的比表面积,明确的纳米结构以及WO 3和gC 3 N之间的强相互作用。4。WO 3纳米薄片在gC 3 N 4载体上的分布增加了该反应的催化活性位点的数量。XPS分析表明,由于电子从gC 3 N 4转移至WO 3而产生了协同电子效应。。此外,研究了反应温度,反应时间,氧化剂用量和催化剂用量对催化活性的影响。循环研究表明,该催化剂可以容易地回收,并且在七个循环后没有观察到明显的催化效率下降。本发明的催化体系可以为芳基醇和烷基醇提供宽的底物范围,并具有优异的转化率和选择性。另外,提出了合
Kinetics and Mechanism of Oxidation of 1-Methoxy-2-propanol and 1-Ethoxy-2-propanol by Ditelluratocuprate(III) in Alkaline Medium
作者:Jinhuan Shan、Yanping Liu、Jiying Zhang
DOI:10.1002/cjoc.201190134
日期:2011.4
The kinetics of oxidation of 1‐methoxy‐2‐propanol and 1‐ethoxy‐2‐propanol by ditelluratocuprate(III) (DTC) in alkaline liquids has been studied spectrophotometrically in the temperature range of 293.2–313.2 K. The reaction rate showed first order dependence in DTC and fractional order with respect to 1‐methoxy‐2‐propanol or 1‐ethoxy‐2‐propanol. It was found that the pseudo‐first order rate constant