摘要报道了四种具有单齿1,2-二取代苯并咪唑配体的锌(II)配合物的合成,表征以及它们在CO2和环氧化物的环加成反应中的催化活性。通过1 H和13 C NMR,热分析,红外吸收和FT-Raman光谱以及ESI-HRMS对复合物进行表征。Zn3配合物的结构是通过单晶X射线衍射确定的,并且已经进行了分子内和分子间相互作用的描述。所有的配合物都能够选择性地催化环状碳酸酯的生成,并使用溴化四丁铵作为助催化剂,将配合物Zn1用于将各种环氧化物转化为碳酸酯。量子化学方法被用来理解催化循环的初始步骤:环氧化物与金属中心的配位。
Manganese(I)-Catalyzed Transfer Hydrogenation and Acceptorless Dehydrogenative Condensation: Promotional Influence of the Uncoordinated N-Heterocycle
作者:Chong Zhang、Bowen Hu、Dafa Chen、Haiping Xia
DOI:10.1021/acs.organomet.9b00475
日期:2019.8.26
showed the highest activity. The reactions proceeded well with 0.5 mol % of catalyst loading and 20 mol % of t-BuOK at 85 °C for 24 h. Furthermore, 3 was also used as a catalyst for the synthesis of primary alcohols via transfer hydrogenation of aldehydes and the synthesis of 1,2-disubstituted benzimidazoles and quinolines via acceptorless dehydrogenative condensations.
四种二齿锰(I)配合物[(C 5 H 4 N-C 5 H 3 N-OH)Mn(CO)3 Br](1),[(C 9 H 6 N-C 5 H 3 N-OH)Mn(CO )3 Br](2),[(C 8 H 5 N 2 -C 5 H 3 N-OH)Mn(CO)3 Br](3)和[(C 8 H 5 N 2 -C 5 H 3 N-OCH 3)Mn(CO)3Br](4)被合成。测试了这些配合物作为酮转移氢化的催化剂,其中3种显示出最高的活性。在85℃下,在0.5mol%的催化剂负载量和20mol%的t- BuOK下,反应进行得很好,持续了24小时。此外,3还用作催化剂,用于通过醛的转移氢化合成伯醇,以及通过无受体的脱氢缩合反应合成1,2-二取代的苯并咪唑和喹啉。
The synthesis and structure of an amazing and stable carbonized material Cu-PC@OFM and its catalytic applications in water with mechanism explorations
作者:An-Qi Tian、Xiang-Hao Luo、Zhi-Lin Ren、Jun Zhao、Long Wang
DOI:10.1039/d1nj00861g
日期:——
structure, but also the nano copper particles generated in situ significantly improve the catalytic performance and stability. It was disclosed that the copper-based catalyst material Cu-PC@OFM showed high catalytic activity in the borrowing hydrogen reaction and the synthesis of 1-benzyl-2-aryl-1H-benzo[d]imidazole derivatives with high yields in water. This coppercatalytic system provided a much greener
通过HRTEM,SEM,XRD,XPS和拉曼光谱以及氮吸附/解吸分析,合成并表征了一种令人惊奇且稳定的碳化八面体框架材料Cu-PC @ OFM。特别地,负载有纳米铜的碳基质载体不仅保持原始结构,而且原位产生的纳米铜颗粒也显着改善了催化性能和稳定性。公开了铜基催化剂材料Cu-PC @ OFM在借位氢反应和1-苄基-2-芳基-1 H-苯并[ d]的合成中显示出高催化活性。]咪唑衍生物在水中的产率高。该铜催化体系为合成功能化的胺和1-苄基-2-芳基-1 H-苯并[ d ]咪唑在水中具有良好的回收性能提供了更加绿色和高效的催化剂,这是Cu-的第一个实例。 PC @ OFM材料催化的1-苄基-2-芳基-1 H-苯并[ d ]咪唑的合成。此外,通过一些条件控制实验,氘标记实验和中间体分离实验,提出了合理的反应机理。
Ligand-tuned cobalt-containing coordination polymers and applications in water
作者:Rong Tao、Yike Yang、Haiyan Zhu、Xinyu Hu、Dawei Wang
DOI:10.1039/d0gc02341h
日期:——
could promote the alkylation of ketones with alcohols and alcohols with alcohols, while Co-NCIA was effective for the synthesis of 1-benzyl-2-aryl-1H-benzo[d]imidazoles from various phenylenediamine and benzyl alcohols through borrowing hydrogen and dehydrogenation strategies. Other mechanism explorations, such as deuterium labeling experiments and a kinetics study, were conducted to better understand
A modern and practical laccase-catalysed route suitable for the synthesis of 2-arylbenzimidazoles and 2-arylbenzothiazoles
作者:Mudzuli Maphupha、Wanyama P. Juma、Charles B. de Koning、Dean Brady
DOI:10.1039/c8ra07377e
日期:——
Green chemistry: laccase in acetonitrile and buffer in the presence of O2 can synthesise benzimidazoles and benzothiazoles in good yields.
绿色化学:在乙腈和缓冲液中,存在氧气的情况下,漆酶可以合成苯并咪唑和苯并噻唑,产率较高。
BINAP-copper supported by hydrotalcite as an efficient catalyst for the borrowing hydrogen reaction and dehydrogenation cyclization under water or solvent-free conditions
作者:Zhaojun Xu、Xiaoli Yu、Xinxin Sang、Dawei Wang
DOI:10.1039/c8gc00557e
日期:——
A BINAP-Cu system supported by hydrotalcite has been developed and proved to be a highlyefficientcatalyst for the atom-efficient and green borrowing hydrogen reaction and dehydrogenative cyclization. This BINAP-Cu complex supported by hydrotalcite is highly air-stable and can be recycled at least five times under solvent-free conditions. Notably, 1-benzyl-2-aryl-1H-benzo[d]imidazole derivatives could
已经开发了由水滑石支撑的BINAP-Cu系统,并被证明是一种高效的催化剂,用于原子效率高的绿色借入氢反应和脱氢环化反应。这种由水滑石负载的BINAP-Cu络合物具有高度的空气稳定性,在无溶剂条件下可以循环至少五次。值得注意的是,第一次以水为溶剂仅一步即可由醇合成1-苄基-2-芳基-1 H-苯并[ d ]咪唑衍生物。这为在水或无溶剂条件下以高收率合成官能化的胺,酮和1-苄基-2-芳基-1 H-苯并[ d ]咪唑衍生物提供了一种更加绿色有效的催化方法。