Anchoring of Cu(II)-vanillin Schiff base complex on MCM-41: A highly efficient and recyclable catalyst for synthesis of sulfides and 5-substituted 1<i>H</i>
-tetrazoles and oxidation of sulfides to sulfoxides
A copper(II)–vanillin complex was immobilized onto MCM‐41 nanostructure and was used as an inexpensive, non‐toxic and heterogeneous catalyst in the synthesis of symmetric aryl sulfides by the cross‐coupling of aromatic halides with S8 as an effective sulfur source, in the oxidation of sulfides to sulfoxides using 30% H2O2 as a green oxidant and in the synthesis of 5‐substituted 1H–tetrazoles from a
铜(II)-香兰素络合物被固定在MCM-41纳米结构上,并且通过芳族卤化物与S 8作为有效硫的交叉偶联,被用作廉价,无毒且非均相的对称芳基硫化物的合成催化剂来源,包括使用30%H 2 O 2作为绿色氧化剂将硫化物氧化为亚砜,以及将有机腈与叠氮化钠(NaN 3)平稳(3 + 2)环加成合成5取代的1 H-四唑。)。获得的产物具有良好至优异的产率。该催化剂可以重复使用几次而不会损失活性。使用傅里叶变换红外光谱,能量色散X射线和原子吸收光谱,X射线衍射,热重分析以及扫描和透射电子显微镜对催化剂进行表征。
Guanidine complex of copper supported on boehmite nanoparticles as practical, recyclable, chemo and homoselective organic–inorganic hybrid nanocatalyst for organic reactions
Afterwards, a newcomplex of copper was immobilized on BO‐NPs (Cu‐Guanidine@BO‐NPs). This heterogeneous nanocatalyst was used as a practical, recyclable, chemo and homoselectivenanocatalyst in the organic processes, i.e. the preparation of tetrazole five‐membered heterocycles and chemoselective sulfoxidation of sulfides using H2O2 as oxidant. In this sense, the prepared nanocatalyst was characterized
通过在室温下将NaOH水溶液注入硝酸铝水溶液中来制备勃姆石(BO)纳米粒子(NPs)。之后,将新的铜络合物固定在BO-NP上(Cu-Guanidine @ BO-NPs)。这种非均相纳米催化剂在有机过程中被用作实用,可回收,化学和均选择性的纳米催化剂,即使用H 2 O 2作为氧化剂制备四唑五元杂环和硫化物的化学选择性硫氧化。从这个意义上讲,制备的纳米催化剂的特征在于AAS,N 2吸附-解吸等温线,WDX,EDS,SEM和TGA技术。在描述的有机反应中对这种催化剂的可重复使用性进行了几次试验,没有明显降低其催化活性。此外,所有四唑和亚砜衍生物均以高周转数(TON)和周转频率(TOF)数分离,表明在上述反应中Cu-Guanidine @ BO-NPs具有高活性和选择性。
Fe
<sub>3</sub>
O
<sub>4</sub>
@L‐lysine‐Pd(0) organic–inorganic hybrid: As a novel heterogeneous magnetic nanocatalyst for chemo and homoselective [2 + 3] cycloaddition synthesis of 5‐substituted 1H‐tetrazoles
An efficient and sustainable synthetic protocol has been presented to synthesis and 5‐substituted1H‐tetrazole privileged heterocyclic substructures. The synthetic protocolinvolves two‐component reaction between aryl nitriles and NaN3 in water using complex of L‐lysine‐palladium nanoparticles (NPs) modified Fe3O4 nanoparticles as magnetically separable, recyclable, and reusable heterogeneous catalyst
已经提出了一种有效且可持续的合成方案,用于合成和5取代的1H-四唑特权杂环亚结构。合成方案涉及使用L-赖氨酸-钯纳米粒子(NPs)修饰的Fe 3 O 4纳米粒子复合物作为磁性可分离,可回收和可重复使用的多相催化剂,使芳基腈与水中的NaN 3之间发生两组分反应。磁性可回收L-赖氨酸-Pd(0)修饰的Fe 3 O 4纳米粒子被用于5个取代的1H-四唑的[2 + 3]环加成合成中。该策略的优势包括昂贵的Pd NP的易于回收和有效的可重复使用性,[2 + 3]环加成的高收率,较短的反应时间,并且所有报道的合成策略都在水中作为绿色溶剂广泛应用基材范围。
An efficient and recyclable catalytic system for carbon–sulfur coupling reaction and synthesis of 5-substituted 1H-tetrazoles
ABSTRACT In this research paper, efficient and economical protocols for the synthesis of symmetrical sulfides and 5-substituted 1H-tetrazoles have been reported using Fe3O4@SBTU@Ni(II) as a heterogeneous and recoverable nanocatalyst. The noticeable features of this catalytic system are: operational simplicity, environmentally benign, easier work-up procedure, green and efficient synthetic entry to
Copper and nickel immobilized on cytosine@MCM‐41: as highly efficient, reusable and organic–inorganic hybrid nanocatalysts for the homoselective synthesis of tetrazoles and pyranopyrazoles
In this work, a green approach is reported for efficientsynthesis of biologically active tetrazole and pyranopyrazole derivatives in the presence of Cu‐Cytosine@MCM‐41 and Ni‐Cytosine@MCM‐41 (copper (II) and nickel (II) catalyst on the modified MCM‐41 using cytosine). The synthesis of tetrazoles and pyranopyrazoles in the presence of these catalysts was performed in greensolvents such as water or